Geophysics, Lecture Notes- Physics - Prof Gavin Bell 15

Geophysics, Lecture Notes- Physics - Prof Gavin Bell 15 -...

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PX266 Geophysics (2010/11) Lecture 11 Handout – Earthquakes Dr. Gavin Bell Above : four basic types of faults Below : intensity distribution for two large earthquakes in the USA The New Madrid quakes have a much longer “range” due to the weak attenuation of seismic waves passing through the simple geological structures of the Mid West (recall Bouguer anomaly across the USA – pretty featureless here). The west coast lies on a tectonic plate boundary and more attenuation occurs in the complex geological structures found here.
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Modified Mercalli Intensity Scale I. People do not feel any Earth movement. II. A few people might notice movement if they are at rest and/or on the upper floors of tall buildings. III. Many people indoors feel movement. Hanging objects swing back and forth. People outdoors might not realize that an earthquake is occurring. IV. Most people indoors feel movement. Hanging objects swing. Dishes, windows, and doors rattle. The earthquake feels like a heavy truck hitting the walls. A few people outdoors may
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This note was uploaded on 09/12/2011 for the course ECON 102 taught by Professor Gavinbell during the Spring '11 term at LSE.

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Geophysics, Lecture Notes- Physics - Prof Gavin Bell 15 -...

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