EPS C20 Lecture Notes - Lecture 14: 1994 Northridge Earthquake, Walker Lane, Santa Monica Mountains
17 Nov 2020
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Ridgecrest sequence : july 4th & 5th, 2019. Always show epicenter (point at surface of earth where earthquake started) Epicenter: the point which an earthquake occurs. There is a length associated with them. The aftershocks area good indicator of the length of fault that ruptured. Most aftershocks occur in regions that ruptured in main shock. This gives sense of size of fault. Length of main fault is about 50 km. Depth range of most earthquakes is 8 km. 10 km x 50 km = 500 km^2. Rupture occurs from point & takes 500 seconds to travel, 8 minutes from when it started to when it ended. Use of array of seismometers to map source energy in space & time. Physical rupture model for a m7 earthquake slip. Fault plane (where two rocks slide past one another), surface fault, dip, strike (orientation of surface break) Rupture across the fault surface: rupture area = length x width.
