EARTHSS 17 Lecture Notes - Lecture 7: Yungay, Peru, 1700 Cascadia Earthquake, Town Square
14 Oct 2016
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Document Summary
P and s waves travel at different velocities. P and s wave arrivals vary with distance. Distance (d) from earthquake d - t/ (1/v^s - 1/v^p) 3 seismic stations: radius is equal to the distance to epicenter. A circle is drawn around each station. Circles around 3 or more stations will intersect. The point of intersection is the epicenter. P waves do not cause the most damage in an earthquake. P waves are the fastest of the seismic waves. P waves can move through solids, liquids, or gasses. P waves move with a push/pull motion. Will cause least amount of damage -- you feel the p wave first and it is like a small jolt. Depends on how you measure it --- trick question. Magnitude: based on seismograms and other measurements (quantitative) Earthquake intensity is a qualitative measure of damage extent: Roman numerals i - xii assigned to different levels of damage.
