EARTHSC 1121 Lecture Notes - Lecture 14: Hypocenter, Foreshock, Seismometer
23 Mar 2017
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Document Summary
Carmen-related issue (earthquakes file) has not yet been resolved. Once motion starts, it quickly stops due to friction. Eventually, strain will build up again, causing failure. When rocks break, stored elastic strain is released. (potential energy is released, as it hits the pond, it is transferred into mechanical energy. ) This energy radiates outward from the hypocenter. Vibrations cause motion, as when a bell is rung. Foreshock is never recognized until the main shock happens. Displacement scale varies from small to large. Large events tear huge fault segments 100s of kms long. Faulting may result in uplift or subsidence. You can go to quake. usgs. gov and find an earthquake almost instantly, also showing a map of the earthquake. Compressional or primary (p) waves (short for pressure) Love waves (named after person who found them)--s-waves intersecting the surface. Move back and forth like a writhing snake. These waves are the slowest and most destructive. Seismology is the study of earthquake waves.
