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This is a seismogram from the Honiara seismic station in the Solomon Islands. The noise was caused by a magnitude 7.1 offshore earthquake in the Vanuatu / New Hebrides archipelago (= southwestern Pacific Ocean). The quake occurred at 11:56 PM, local time, on 7 December 2023. The epicenter was about 80 kilometers southwest of Aneityum Island. The hypocenter was between 45 and 50 kilometers deep. Shaking resulted from reverse faulting along a north-northwest to south-southeast striking fault zone. This is the 19th magnitude 7+ earthquake of 2023.
This was a subduction zone earthquake, occurring where one tectonic plate composed of oceanic lithosphere dives beneath another tectonic plate. In this case, the Australian Plate is subducting beneath the Pacific Plate along a deep seafloor trough called the New Hebrides Trench (also known as the South New Hebrides Trench).
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/us7000lgwp/exec...
[An event-specific summary is at the bottom of that page.]
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An earthquake is a natural shaking or vibrating of the Earth caused by sudden fault movement and a rapid release of energy. Earthquake activity is called "seismicity". The study of earthquakes is called "seismology". The actual underground location of an earthquake is the hypocenter, or focus. The site at the Earth's surface, directly above the hypocenter, is the epicenter. Minor earthquakes may occur before a major event - such small quakes are called foreshocks. Minor to major quakes after a major event are aftershocks.
Most earthquakes occur at or near tectonic plate boundaries, such as subduction zones, mid-ocean ridges, collision zones, and transform plate boundaries. They also occur at hotspots - large subsurface mantle plumes (Examples: Hawaii, Yellowstone, Iceland, Afar).
Earthquakes generate four types of shock waves: P-waves, S-waves, Love waves, and Rayleigh waves. P-waves and S-waves are body waves - they travel through solid rocks. Love waves and Rayleigh waves travel only at the surface - they are surface waves. P-waves are push-pull waves that travel quickly and cause little damage. S-waves are up-and-down waves (like flicking a rope) that travel slowly and cause significant damage. Love waves are side-to-side surface waves, like a slithering snake. Rayleigh waves are rotational surface waves, somewhat like ripples from tossing a pebble into a pond.
Earthquakes are associated with many specific hazards, such as ground shaking, ground rupturing, subsidence (sinking), uplift (rising), tsunamis, landslides, fires, and liquefaction.
Some famous major earthquakes in history include: Shensi, China in 1556; Lisbon, Portugal in 1755; New Madrid, Missouri in 1811-1812; San Francisco, California in 1906; Anchorage, Alaska in 1964; and Loma Prieta, California in 1989.
This little house used to be Möja school. The building is "K" marked and no changes whatsoever are allowed.
The basement contains a shelter known to very few including the police.
One very famous liquor smuggler was hidden in the shelter and got away from getting caught. The inhabitants in the neighbourhood cared well for their suppliers.
STOCKHOLM ARCHIPELAGO
The Stockholm Archipelago fans out 80 km out from the city and is some 24,000 islands big. The nearest islands of Fjäderholmarna and beautiful fortress town of Vaxholm are less than an hour away by boat. The larger populated islands, for example; Sandhamn, Blidö and Utö have hotels, holiday homes, restaurants, marinas and offer loads of activities. Most of the islands are small and uninhabited and waiting for you to discover them, perhaps by boat, canoe or kayak.
The Stockholm Archipelago fans out 80 km out from the city and is some 24,000 islands big. The nearest islands of Fjäderholmarna and beautiful fortress town of Vaxholm are less than an hour away by boat. The larger populated islands, for example; Sandhamn, Blidö and Utö have hotels, holiday homes, restaurants, marinas and offer loads of activities. Most of the islands are small and uninhabited and waiting for you to discover them, perhaps by boat, canoe or kayak.