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Churchill County, Nevada
When the energy from pressure built up underneath the Earth's thin crust is suddenly released, an earthquake occurs. At first the crust may just bend. But if the stress is great enough, the rocks will break and "snap" to a new position. This usually happens along fractures in the earth known as faults. if the fault lies close to the surface it may become visible following a large earthquake - the area directly in front of you is an example of this.
Between July and December 1954, six earthquakes and two major aftershocks rocked western Nevada a eastern California. The largest of these, measuring 7.3 on the Richter Scale, was centered seven miles west of here and happened on December 16th. These quakes were felt as far away as Elko, NV and Sacramento, CA. More than 50 miles of faulting were exposed on Fairview Peak and in the Stillwater Range to the northwest. In a matter of moments, the mountains lifted up an average of six feet relative to the surrounding valleys. In some places the mountains rose more than 20 feet! Try to imagine what it must have felt like, and how you might have reacted if you had been camping in this area that day.
The sculpture near the bottom of this photo is a memorial erected for those lost in the 2004 Indian Ocean earthquake / tsunami, extinguishing more than 225 000 souls.
Faults are often hard to spot in the chalk. This one ascends the cliff to the right at about 40 degrees. It slightly displaces the lowest flint bands but movement is hard to see further up. Faults are not simple planar objects with fixed displacement throughout.
Geology of the chalk explained in nice pictures at:
www.discoveringfossils.co.uk/sevensisters_fossils.htm
This image is also available as part of a pretty slide show (HD too) with music. Go to:
This sandstone from the Black Hills of South Dakota, was faulted, and the layers offset, during compaction.
walking in East Dallas, Texas
iPhone 1/5/12
www.flickr.com/photos/guyr/sets/72157628736812373/with/66...
Churchill County, Nevada
When the energy from pressure built up underneath the Earth's thin crust is suddenly released, an earthquake occurs. At first the crust may just bend. But if the stress is great enough, the rocks will break and "snap" to a new position. This usually happens along fractures in the earth known as faults. if the fault lies close to the surface it may become visible following a large earthquake - the area directly in front of you is an example of this.
Between July and December 1954, six earthquakes and two major aftershocks rocked western Nevada a eastern California. The largest of these, measuring 7.3 on the Richter Scale, was centered seven miles west of here and happened on December 16th. These quakes were felt as far away as Elko, NV and Sacramento, CA. More than 50 miles of faulting were exposed on Fairview Peak and in the Stillwater Range to the northwest. In a matter of moments, the mountains lifted up an average of six feet relative to the surrounding valleys. In some places the mountains rose more than 20 feet! Try to imagine what it must have felt like, and how you might have reacted if you had been camping in this area that day.