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"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
This is a volcanic deposit near Mt. Lassen (Lassen Peak), a prominent volcano and the key scenery in Lassen Volcanic National Park. Lassen Volcano is part of the Cascade Range, a north-south linear chain of active and potentially active volcanoes in America's Pacific Northwest. It extends from northern California to Oregon, Washington State, and into British Columbia, Canada. The Cascade Range formed as a result of tectonic subduction - the offshore Juan de Fuca Plate is diving below the North American Plate. The diving plate causes melting in the mantle. The melt rises and emerges at the surface at volcanic centers. Famous Cascade Range volcanoes include Mt. St. Helens, which had a large eruption in May 1980, Mt. Rainier near Seattle, Mt. Hood, which is the highest peak in Oregon, and Mt. Mazama, which destroyed itself 7,700 years ago in an enormous eruption that produced the modern-day Crater Lake Caldera (also a national park).
Mt. Lassen is a large volcanic dome that developed by lava extruding along the northeastern flanks of a former Cascade Range feature called Brokeoff Volcano (also known as Tehama Volcano). Brokeoff Volcano is an andesitic-dacitic subduction zone stratovolcano (composite volcano). Stratovolcanoes usually have violent, explosive ash eruptions. They tend to erupt igneous materials of intermediate chemistry (between felsic and mafic). Brokeoff Volcano was active from about 4 million years ago, during the Pliocene, to about 400,000 years ago. Only the caldera exists today. Calderas are large holes or depressions left behind after a volcano destroys itself or collapses. The Brokeoff Caldera is an erosional and slow-collapse caldera that formed before about 350,000 years ago.
The Mt. Lassen volcanic dome first started forming in the Late Pleistocene, at about 29 ka. It is principally composed of dacite lava, an extrusive igneous rock that is usually porphyritic-textured. Dacite is between andesite and rhyolite in silica content. Activity through time has ranged from dacite lava extrusion to explosive ash eruptions. Mt. Lassen last experienced eruptive activity in the early 1900s (1914 to 1921).
The boulders shown here are in a volcanic debris flow deposit from 19 and 22 May 1915, when Mt. Lassen last had a significant eruption. The deposit consists of fine sediments, cobbles, and boulders, some of which are quite large. Clasts in the flow deposit include pinkish-reddish porphyritic dacite and gray porphyritic dacite, both of which formed at 27 ka during the Late Pleistocene, early in Mt. Lassen's history. Another clast type in the deposit is black porphyritic dacite, which formed on 14 May 1915. Other clast types present include dacite pumice and banded andesite-dacite pumice, both of which formed on 22 May 1915.
Locality: Devastated Area, Lassen Volcano National Park, northeastern California, USA
One of the major stratovolcanoes of the Cascade Range. Height 3426 metres (11,239 feet). A view from Bennett Pass, southeast of the mountain.
"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
This is a volcanic deposit near Mt. Lassen (Lassen Peak), a prominent volcano and the key scenery in Lassen Volcanic National Park. Lassen Volcano is part of the Cascade Range, a north-south linear chain of active and potentially active volcanoes in America's Pacific Northwest. It extends from northern California to Oregon, Washington State, and into British Columbia, Canada. The Cascade Range formed as a result of tectonic subduction - the offshore Juan de Fuca Plate is diving below the North American Plate. The diving plate causes melting in the mantle. The melt rises and emerges at the surface at volcanic centers. Famous Cascade Range volcanoes include Mt. St. Helens, which had a large eruption in May 1980, Mt. Rainier near Seattle, Mt. Hood, which is the highest peak in Oregon, and Mt. Mazama, which destroyed itself 7,700 years ago in an enormous eruption that produced the modern-day Crater Lake Caldera (also a national park).
Mt. Lassen is a large volcanic dome that developed by lava extruding along the northeastern flanks of a former Cascade Range feature called Brokeoff Volcano (also known as Tehama Volcano). Brokeoff Volcano is an andesitic-dacitic subduction zone stratovolcano (composite volcano). Stratovolcanoes usually have violent, explosive ash eruptions. They tend to erupt igneous materials of intermediate chemistry (between felsic and mafic). Brokeoff Volcano was active from about 4 million years ago, during the Pliocene, to about 400,000 years ago. Only the caldera exists today. Calderas are large holes or depressions left behind after a volcano destroys itself or collapses. The Brokeoff Caldera is an erosional and slow-collapse caldera that formed before about 350,000 years ago.
The Mt. Lassen volcanic dome first started forming in the Late Pleistocene, at about 29 ka. It is principally composed of dacite lava, an extrusive igneous rock that is usually porphyritic-textured. Dacite is between andesite and rhyolite in silica content. Activity through time has ranged from dacite lava extrusion to explosive ash eruptions. Mt. Lassen last experienced eruptive activity in the early 1900s (1914 to 1921).
The boulders and cobbles shown here are in a volcanic debris flow deposit from 19 and 22 May 1915, when Mt. Lassen last had a significant eruption. The deposit consists of fine sediments, cobbles, and boulders, some of which are quite large. Clasts in the flow deposit include pinkish-reddish porphyritic dacite and gray porphyritic dacite, both of which formed at 27 ka during the Late Pleistocene, early in Mt. Lassen's history. Another clast type in the deposit is black porphyritic dacite, which formed on 14 May 1915. Other clast types present include dacite pumice and banded andesite-dacite pumice, both of which formed on 22 May 1915.
Locality: Devastated Area, Lassen Volcano National Park, northeastern California, USA
Mount Zaō (蔵王山, Zaō-san) is a complex volcano on the border between Yamagata Prefecture and Miyagi Prefecture in Japan. It consists of a cluster of stratovolcanoes and is the most active volcano in northern Honshū. The central volcano of the group includes several lava domes and a tuff cone, Goshiki-dake, which contains a crater lake named Okama. Also known as the 'Five Color Pond' (五色沼, goshiki numa) because it changes color depending on the weather, it lies in a crater formed by a volcanic eruption in the 1720s. The lake is 360 metres (1,200 ft) in diameter and 60 m (200 ft) deep, and is one of the main tourist attractions in the area.
This is a diagram of how a stratovolcano is formed.
Where the two plates meet, sometimes one moves down, while the other moves upward. As the plate that is moving down is forced deeper, parts of it begin to melt and form magma that rises to the surface, often in explosive eruptions. The plate that rises, tends to create large, classic, cone-shaped volcanoes called stratovolcanoes, such as Mt. Hekla.
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Explain why the eruption happened>
It is most likely that the eruptio happened because the tetonic plates that meet in Iceland and sometimes split apart with terrific results. Sometimes the plated go in different directions, up and down, but sometimes they move in different direction rubbing against one another. When a plate moves down (subduction), being forced deep, part of it begin to melt and form magma that rises to the surface, often in explosive eruptions. Subduction zones tend to create large, classic, cone-shaped volcanoes called stratovolcanoes, such as Mt. Hekla.
blue fire ijen, ijen crater tour package, ijen volcano tour package
Ijen crater have the sunrise and green views. Not only that, Ijen plateau or Ijen Crater also have a blue flame/blue fire phenomenon that there are only 2 in the world. one in Iceland. to see the blue flame at ijen crater, to visite ijen cratere tourists should come in the morning precisely at dawn or travelers can depart from the hotel to the starting point at approximately 1 am. Travelers will climb 3 km is not it and they will come down to the crater, the road to the bottom of the crater are very steep and hard about about 800 meters. Only then, the blue flame pins. This amazing natural phenomenon. Blue flame at Ijen volcano is unique, rare, and becoming an attraction itself. It also adds to the beauty of Ijen Crater the after sunrise.
ijen crater complex is a group of stratovolcanoes, in East Java, Indonesia. It is inside a larger caldera, which is about 20 kilometers wide. The Gunung Merapi stratovolcano is the highest point of that complex. West of Gunung Merapi is the Ijen crater, which has a one-kilometer-wide turquoise-colored acid crater lake. The lake is the site of a labor-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor. The work is low-paid and very onerous. Workers earn around $5.50-$8.30 (Rp 50,000 – Rp 75,000) per day and once out of the crater, still need to carry their loads of sulfur chunks about three kilometers to the nearby Pultuding valley to get paid.
Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones forms an east/west-trending zone across the southern side of the caldera. The active crater at Kawah Ijen has an equivalent radius of 361 metres (1,184 ft), a surface of 0.41 square kilometres (0.16 sq mi). It is 200 metres (660 ft) deep and has a volume of 36 cubic hectometres (29,000 acre•ft).
Ijen Crater Blue fire tour
ITTENARARY
Best moment to visit ijen for blue flame 01.00 Am, Our staff will pick up you from the hotel, Then we will continue the journey to the ijen crater. ijen expedition team will bring you to parking area of ijen crater. From the hotel to the parking area palltuding takes 45 minute. It’will be an interesting journey, Precisely in the Tamansari village, where you will pass the coffee plantation sand clove which you may visit after or on the way back to the hotel. After passing through the plantation, you will be presented with a view of the rainforest, In which there are a wide range of plants, large trees, and the most interesting is the giant ferns that exist in ancient times. Then you will reach the parking area.finally you are going to walk as far as three kilometers. about 2 kilo meters uphill and 1 kilo meter flat. After that you can enjoy the beauty of the blue fire until the sun come up and you can see the biggest crater lake in indonesia and the mining worker carrying the sulfur. after you enjoy the beauty of ijen crater. we will back to parking then we escort you back to the hotel with visiting the plantation at last trip on the way back. enjoy the blue fire .
For further information about our tour package (itinerary and also quotation), Please feel free to contact us on :
Email : ijenexpeditiontrip@gmail.com
Office : jln.Tamansari Licin Banyuwangi
Whatsapp : +6281236757424
website: ijenexpeditiontour.com/tour/blue-fire-trip-1-days-1-night/
"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
The Ijen volcano complex is a group of stratovolcanoes, in East Java, Indonesia. It is inside a larger caldera Ijen, which is about 20 kilometers wide. The Gunung Merapi stratovolcano is the highest point of that complex.
West of Gunung Merapi is the Ijen volcano, which has a one-kilometer-wide turquoise-colored acid crater lake. The lake is the site of a labor-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor. Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones forms an E-W-trending zone across the southern side of the caldera. The active crater at Kawah Ijen has an equivalent radius of 361 meters, a surface of 41 × 106 square meters. It is 200 meters deep and has a volume of 36 × 106 cubic meters.
The Cascade Lakes Scenic Byway passes through a volcanic and glacial landscape of incredible diversity and tremendous significance.
Diverse landforms as stratovolcanoes, shield volcanoes, cinder cones, sheets of pumice and ash, sheets of ash-flow tuffs, maars, caves, and several kinds of lava flows and domes.
"Snow-covered Villarrica, one of Chile's most active volcanoes, rises above the lake and town of the same name. The volcano is also known as Rucapillán, a Mapuche word meaning "House of the Pillán". It is the westernmost of three large stratovolcanoes that trend perpendicular to the Andean chain along the Gastre Fault. Villarrica The volcano, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Ascents of the volcano are popular with several guided ascents reaching the top during summer"
Satellite: Sentinel-2.
Visualization RGB: bands 4 (red), 3 (green), 2 (blue). True color.
La imagen tiene 80 km de ancho (aprox.)
En esta imagen destacan las dos puntas de flecha apuntando al norte desde los volcanes Cleveland (en el centro) y Carlisle (arriba, a la izquierda de la anterior). Estas son las sombras que delatan la forma cónica de ambos estratovolcanes. La sombra del volcán Herbert (abajo a la izquierda en la imgen) no acaba en punta pues su cumbre es una pequeña caldera.
In this image, the two arrowheads point north from the Cleveland volcano (in the center) and Carlisle volcano (above, to the left of the previous one) that stand out. These are the shadows that reveal the conical shape of both stratovolcanoes. The shadow of the Herbert volcano (bottom left in the image) does not end in a point because its summit is a small caldera
In the northern Pacific Ocean off the southwest coast of Alaska, the planet is building new land. Arcing southwestward from Alaska like the tail of a kite, the Aleutian Islands are a string of active and dormant volcanoes fed by magma created by the collision of the Pacific Plate with the North American Plate. In the northeast part of the range, a cluster of summits known as the Islands of the Four Mountains is home to Cleveland Volcano, one of the Aleutians’ most frequently active volcanoes.
In the center of the image, Cleveland Volcano is connected to Chuginadak Volcano by a thin strip of land that appears to be barely above sea level in places. Together these mountains make up Chuginadak Island. (earthobservatory.nasa.gov/images/8013/islands-of-the-four...)
Image Lake and Glacier Peak seen from Miner's Ridge, Glacier Peak Wilderness North Cascades Washington.
Glacier Peak (10,541′) or Dakobed is the most isolated of the five major stratovolcanoes of the Cascade Volcanic Arc.
Having wandered a few hundred metres along the seafront we look back at the small sleepy town where we will be staying for the next few days.
Lipari, the ancient Meligunis, is the largest island of the Aeolian Archipelago and its economic and cultural center. It is located immediately north of Vulcano Island. The island contains numerous small stratovolcanoes, craters, and lava domes on a basement of submarine volcanic deposits.
This is a volcanic deposit near Mt. Lassen (Lassen Peak), a prominent volcano and the key scenery in Lassen Volcanic National Park. Lassen Volcano is part of the Cascade Range, a north-south linear chain of active and potentially active volcanoes in America's Pacific Northwest. It extends from northern California to Oregon, Washington State, and into British Columbia, Canada. The Cascade Range formed as a result of tectonic subduction - the offshore Juan de Fuca Plate is diving below the North American Plate. The diving plate causes melting in the mantle. The melt rises and emerges at the surface at volcanic centers. Famous Cascade Range volcanoes include Mt. St. Helens, which had a large eruption in May 1980, Mt. Rainier near Seattle, Mt. Hood, which is the highest peak in Oregon, and Mt. Mazama, which destroyed itself 7,700 years ago in an enormous eruption that produced the modern-day Crater Lake Caldera (also a national park).
Mt. Lassen is a large volcanic dome that developed by lava extruding along the northeastern flanks of a former Cascade Range feature called Brokeoff Volcano (also known as Tehama Volcano). Brokeoff Volcano is an andesitic-dacitic subduction zone stratovolcano (composite volcano). Stratovolcanoes usually have violent, explosive ash eruptions. They tend to erupt igneous materials of intermediate chemistry (between felsic and mafic). Brokeoff Volcano was active from about 4 million years ago, during the Pliocene, to about 400,000 years ago. Only the caldera exists today. Calderas are large holes or depressions left behind after a volcano destroys itself or collapses. The Brokeoff Caldera is an erosional and slow-collapse caldera that formed before about 350,000 years ago.
The Mt. Lassen volcanic dome first started forming in the Late Pleistocene, at about 29 ka. It is principally composed of dacite lava, an extrusive igneous rock that is usually porphyritic-textured. Dacite is between andesite and rhyolite in silica content. Activity through time has ranged from dacite lava extrusion to explosive ash eruptions. Mt. Lassen last experienced eruptive activity in the early 1900s (1914 to 1921).
The boulders shown here are in a volcanic debris flow deposit from 19 and 22 May 1915, when Mt. Lassen last had a significant eruption. The deposit consists of fine sediments, cobbles, and boulders, some of which are quite large. Clasts in the flow deposit include pinkish-reddish porphyritic dacite and gray porphyritic dacite, both of which formed at 27 ka during the Late Pleistocene, early in Mt. Lassen's history. Another clast type in the deposit is black porphyritic dacite, which formed on 14 May 1915. Other clast types present include dacite pumice and banded andesite-dacite pumice, both of which formed on 22 May 1915.
Locality: Devastated Area, Lassen Volcano National Park, northeastern California, USA
(Aerial photo on public signage at Jonsrud Viewpoint in the town of Sandy, Oregon, USA.)
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Mt. Hood is a subduction zone stratovolcano in northwestern Oregon. It is part of the north-south trending Cascade Range of volcanoes from northern California to southwestern British Columbia. Other famous Cascade volcanoes include Mt. St. Helens, Mt. Rainier, Mt. Shasta, and Mt. Mazama (now Crater Lake Caldera).
Mt. Hood area volcanism started in the Middle Miocene, 8 to 10 million years ago, just after Columbia River Flood Basalt volcanism. Miocene and Pliocene andesites and basalts cap topographic ridges in the Mt. Hood area. During the Late Pliocene (sensu traditio), at 3 to 1.3 million years ago, the Sandy Glacier Volcano occupied the site of the current Mt. Hood. Sandy Glacier Volcano is now mostly buried by the modern Mt. Hood volcanic cone. Mt. Hood itself is less than 730,000 years old - all of its rocks have modern magnetic signatures. Lavas and other eruptive materials are high-silica andesites and low-silica dacites. 70% of the Mt. Hood cone consists of lava flows, while the remaining 30% is volcaniclcastic deposits. The modern cone is less than 300,000 years old. Near the summit of Mt. Hood are lava flows dating to younger than 200,000 years old.
Unlike nearby Mt. St. Helens, Mt. Hood is much older and has had little explosive activity. Most of Mt. Hood's volcanism has consisted of andesite lava flows and dome-building. Few explosive events have occurred through time here - few tephra deposits have a Mt. Hood source.
Mt. Hood rocks are often porphyritic two-pyroxene andesites, plus a little olivine. There's been little chemical variation in Mt. Hood lavas through time. Because of this, individual lava flows are difficult to date based on lithology - they're all the same. Much of Mt. Hood itself is hydrothermally-altered rocks.
Names are assigned to the various eruptive phases in Mt. Hood's history. The Polallie eruptive phase occurred from 12 to 25 thousand years ago. The Timberline eruptive phase occurred ~1500 years ago. The Old Maid eruptive phase occurred over 200 years ago, often dated to 1780-1801 A.D. Dome building occurred from 1781 to 1793. During that time, periodic, relatively small eruptions occurred.
Because Mt. Hood is a snow-clad volcano, activity results in melting of snow and mobilization of loose materials. Rainstorms could also mobilize loose debris in the area. Mt. Hood lahars have probably formed by both mechanisms.
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Info. at:
(still image from the Westdahl Peak web camera on Unimak Island, Alaska)
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Shishaldin Volcano is a subduction zone stratovolcano on Unimak Island in the Aleutian Islands of Alaska. Minor lava eruptions in the summit crater started on 12 July 2023. Thirteen episodes of subsequent explosive ash eruptions took place on 14 July, 15 July, 18 July, 22-23 July, 25-26 July, 4 August, 14-15 August, 25 August, 5 September, 15 September, 24 to 25 September, 3 October, and 2-3 November 2023. Seen here is Shishaldin with a steam plume in the morning of 19 November 2023.
The Aleutian Arc is a subduction zone formed as the Pacific Plate dives underneath the North American Plate (this area is sometimes called the Bering Plate). The diving plate in subduction zones releases water at depth, which causes partial melting of overlying mantle rocks. The low-density melt rises and eventually reaches the surface, forming volcanoes. All subduction zones have volcanoes and frequent seismicity. Volcanoes in such settings tend to have explosive ash eruptions. Rocks and tephra deposits at subduction zone volcanoes are usually intermediate in composition - typically andesitic to dacitic. Shishaldin's erupted materials in 2023 have been mafic (basaltic).
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Info. at:
en.wikipedia.org/wiki/Mount_Shishaldin
and
Mt. Hood is a subduction zone stratovolcano in northwestern Oregon. It is part of the north-south trending Cascade Range of volcanoes from northern California to southwestern British Columbia. Other famous Cascade volcanoes include Mt. St. Helens, Mt. Rainier, Mt. Shasta, and Mt. Mazama (now Crater Lake Caldera).
Mt. Hood area volcanism started in the Middle Miocene, 8 to 10 million years ago, just after Columbia River Flood Basalt volcanism. Miocene and Pliocene andesites and basalts cap topographic ridges in the Mt. Hood area. During the Late Pliocene (sensu traditio), at 3 to 1.3 million years ago, the Sandy Glacier Volcano occupied the site of the current Mt. Hood. Sandy Glacier Volcano is now mostly buried by the modern Mt. Hood volcanic cone. Mt. Hood itself is less than 730,000 years old - all of its rocks have modern magnetic signatures. Lavas and other eruptive materials are high-silica andesites and low-silica dacites. 70% of the Mt. Hood cone consists of lava flows, while the remaining 30% is volcaniclcastic deposits. The modern cone is less than 300,000 years old. Near the summit of Mt. Hood are lava flows dating to younger than 200,000 years old.
Unlike nearby Mt. St. Helens, Mt. Hood is much older and has had little explosive activity. Most of Mt. Hood's volcanism has consisted of andesite lava flows and dome-building. Few explosive events have occurred through time here - few tephra deposits have a Mt. Hood source.
Mt. Hood rocks are often porphyritic two-pyroxene andesites, plus a little olivine. There's been little chemical variation in Mt. Hood lavas through time. Because of this, individual lava flows are difficult to date based on lithology - they're all the same. Much of Mt. Hood itself consists of hydrothermally-altered rocks.
Names are assigned to the various eruptive phases in Mt. Hood's history. The Polallie eruptive phase occurred from 12 to 25 thousand years ago. The Timberline eruptive phase occurred ~1500 years ago. The Old Maid eruptive phase occurred over 200 years ago, often dated to 1780-1801 A.D. Dome building occurred from 1781 to 1793. During that time, periodic, relatively small eruptions occurred.
Because Mt. Hood is a snow-clad volcano, activity results in melting of snow and mobilization of loose materials. Rainstorms could also mobilize loose debris in the area. Mt. Hood lahars have probably formed by both mechanisms.
Locality: Mt. Hood Volcano (looking east from the Jonsrud Viewpoint in the town of Sandy), northwestern Oregon, USA
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Info. at:
Mafic volcanic ash in Alaska. (public domain photo by Alison Williams & provided by the Alaska Volcano Observatory)
Shishaldin Volcano is a subduction zone stratovolcano on Unimak Island in the Aleutian Islands of Alaska. On 12 July 2023, activity at Shishaldin started with minor lava eruptions in the summit crater. Twelve episodes of explosive ash eruptions have occurred since then, on 14 July, 15 July, 18 July, 22-23 July, 25-26 July, 4 August, 14-15 August, 25 August, 5 September, 15 September, 24 to 25 September, and 3 October 2023.
Seen here is a volcanic ash partly covering vegetation at the town of Cold Bay in the Alaskan Peninsula, downwind from Shishaldin. The tephra is from Shishaldin's 11th explosive eruption. The picture was taken just before 12 noon, local time, on 25 September 2023.
Most stratovolcanoes erupt andesite and dacite, but this ash is mafic (= the chemistry of dark-colored igneous rocks - they are silica-poor, rich in calcium, iron, and magnesium, and dominated by plagioclase feldspar and pyroxene). Analysis by the Alaska Volcano Observatory and the United States Geological Survey of scoriaceous lapilli from an August 2023 eruption of Shishaldin shows that this material is tholeiite / tholeiitic basalt with plagioclase feldspar and olivine.
Locality: town of Cold Bay, Alaskan Peninsula, southwestern Alaska, USA
(still image from the Isanotski-Lazaref River web camera on Unimak Island, Alaska)
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Shishaldin Volcano is a subduction zone stratovolcano on Unimak Island in the Aleutian Islands of Alaska. Minor lava eruptions in the summit crater started on 12 July 2023. Twelve episodes of explosive ash eruptions have occurred since then, on 14 July, 15 July, 18 July, 22-23 July, 25-26 July, 4 August, 14-15 August, 25 August, 5 September, 15 September, 25 September, and 3 October 2023. Seen here is Shishaldin with a prominent white steam plume. It is likely the result of snow, ice, and meltwater vaporizing upon contact with hot volcanic rocks and fresh lava in the summit area.
The Aleutian Arc is a subduction zone formed as the Pacific Plate dives underneath the North American Plate (this area is sometimes called the Bering Plate). The diving plate in subduction zones releases water at depth, which causes partial melting of overlying mantle rocks. The low-density melt rises and eventually reaches the surface, forming volcanoes. All subduction zones have volcanoes and frequent seismicity. Volcanoes in such settings tend to have explosive ash eruptions. Rocks and tephra deposits at subduction zone volcanoes are usually intermediate in composition - typically andesitic to dacitic.
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Info. at:
en.wikipedia.org/wiki/Mount_Shishaldin
and
The Ijen volcano complex is a group of stratovolcanoes, in East Java, Indonesia. It is inside a larger caldera Ijen, which is about 20 kilometers wide. The Gunung Merapi stratovolcano is the highest point of that complex.
West of Gunung Merapi is the Ijen volcano, which has a one-kilometer-wide turquoise-colored acid crater lake. The lake is the site of a labor-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor. Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones forms an E-W-trending zone across the southern side of the caldera. The active crater at Kawah Ijen has an equivalent radius of 361 meters, a surface of 41 × 106 square meters. It is 200 meters deep and has a volume of 36 × 106 cubic meters.
earth science, geology, geomorphology, landscape, cushion plant, azorella compacta, llareta, altiplano, volcano, volcanoes, vulcanology, igneous, volcanic, stratovolcano, composite volcano, avalanche debris, parinacota, pomerape, lauca national park, national park, unesco, man and biosphere reserve, mab, chile, south america
From this vantage and with the cloud it’s just barely possible to see the resurgent dome, but it has been building and falling, building and falling ever since 1980. Given enough time it should eventually refill the crater and possibly even rebuild the peak. This is entirely in the nature of stratovolcanoes. 29 years is not even a heartbeat on a geologic scale
The Cascade Lakes Scenic Byway passes through a volcanic and glacial landscape of incredible diversity and tremendous significance.
Diverse landforms as stratovolcanoes, shield volcanoes, cinder cones, sheets of pumice and ash, sheets of ash-flow tuffs, maars, caves, and several kinds of lava flows and domes.
Nestled merely 16 kilometers from the picturesque city of Antigua in Guatemala, Volcán de Fuego (“Volcano of Fire”) stands as a formidable sentinel in the mesmerizing landscape. A distinguished member of the three large stratovolcanoes that loom over Antigua, this geological marvel is an integral part of the Ring of Fire—an arc of volcanoes and seismic fault lines defining the region's dynamic tectonic canvas. Yet Volcán de Fuego boasts a historical tapestry rich with over 60 eruptions since 1524, claiming the title of Central America's most historically active volcano. The catastrophic eruption of June 3, 2018 etched a recently somber reminder of this volcano’s presence, compelling the evacuation of 3,100 residents and the loss of approximately 165 lives. Volcán de Fuego remains active with daily explosions and ash fall. However, the resilient spirit and cultural heritage of the Guatemalan people are intricately intertwined with these volatile forces of nature. The Mayan culture depicts volcanoes as embodying a dualistic symbolism of powerful entities capable of both destruction and nourishment. This is seen in the rich agriculture and fertile soils that fuel Antigua’s flourishing coffee production. This photograph captures not just the formidable presence of Volcán de Fuego, but also the complex interplay between nature's fury and the unwavering spirit of a community that finds resilience and sustenance amidst the shadows of adversity.
Purpose of the trip: The trip to Guatemala was one taken as a global medical initiative to provide healthcare and education to impoverished regions of Guatemala. Partnering with local programs and clinics in the country, this endeavor was a testament to the commitment to not only broaden healthcare access, but to form enduring connections with the communities served as well. The makeshift clinics each day, set up in school classrooms and community centers, offered a spectrum of services—ranging from physical exams, urinalysis, blood glucose checks, to ultrasounds, steroid injections, pelvic exams, and medication and eyeglasses administration. The majority seeking care at these clinics were women, children, and the elderly, as many of the men were often absent due to daytime work toiling in fields or managing storefronts.
Ashley Piwkiewicz
I love this song: www.youtube.com/watch?v=IJR81_wpOrI&feature=related which one (for me) perfectly suit this photo... Enjoy!
The highest peak in Arizona at 12,637 feet (3,852 m) high is Humphreys Peak, a part of the San Francisco Peaks. These peaks are a string of extinct volcanoes that are called Stratovolcanoes, grouped in with Vesuvius and Krakatoa...
photo by jadoretotravel
How often does one get the opportunity of climbing a real volcano and shooting a selfie on top of the caldera. With toxic fumes and an a toxic pond in the background?
The Ijen volcano complex is a group of stratovolcanoes, in East Java, Indonesia. It is inside a larger caldera Ijen, which is about 20 kilometers wide. The Gunung Merapi stratovolcano is the highest point of that complex. The name of this volcano resembles that of a different volcano, Mount Merapi in central Java, also known as Gunung Merapi. The name "Merapi" means "fire" in the Indonesian language. From: wiki.
Java is the world's most densely populated island (population: 136 million). It is home to 60% of Indonesia's population. Much of Indonesian history took place on Java; it was the centre of powerful Hindu-Buddhist empires, Islamic sultanates, the core of the colonial Dutch East Indies, and was at the centre of Indonesia's campaign for independence. The island dominates Indonesian social, political and economic life. More information on wikipedia.
Villarrica is one of Chile's most active volcanoes, rising above the lake and town of the same name, 750 km (470 mi) south of Santiago. It is also known as Rucapillán, a Mapuche word meaning "Pillan's house". It is the westernmost of three large stratovolcanoes that trend NW-SW obliquely perpendicular to the Andean chain along the Mocha-Villarrica Fault Zone, along with Quetrupillán and the Chilean portion of Lanín, are protected within Villarrica National Park. Guided ascents are popular during summer months.
Villarrica, with its lava of basaltic-andesitic composition, is one of a small number worldwide known to have an active (but in this case intermittent) lava lake within its crater. The volcano usually generates strombolian eruptions with ejection of incandescent pyroclasts and lava flows. Rainfall plus melted snow and glacier ice can cause massive lahars (mud and debris flows), such as during the eruptions of 1964 and 1971.
Villarrica is one of 9 volcanoes currently monitored by the Deep Earth Carbon Degassing Project. The project is collecting data on the carbon dioxide and sulphur dioxide emission rates from subaerial volcanoes.
Arequipa - Mirador de vólcanes
Sabancaya is an active 5,976-metre (19,606 ft) stratovolcano in the Andes of southern Peru. It is the most active volcano in Peru and is part of a 20-kilometre (12 mi) north-south chain of three major stratovolcanoes
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