Earth Sciences 1022A/B Lecture Notes - Ground Vibrations, Wind Wave, Epicenter
Document Summary
Earth sciences 1022b lecture brief 11 feb 14. Foreshocks and aftershocks accompany the main event with some earthquakes. Seismic stations around the world indicate that earthquakes occur mainly at plate boundaries and are shallow, intermediate, deep (>300m); shallow most destructive. Measuring the size of earthquakes: the richter scale measures earthquake magnitude based on the amplitude of the largest wave on the seismogram which depends on the energy released; largest earthquakes recorded in history ~8. 9. Prediction: short-range predictions (hours to days) are not yet feasible. Long-range predictions are made where seismic gaps occur along plate boundaries that is, where no big earthquakes have happened for at least 100 years; overdue.