EPS C20 Lecture Notes - Lecture 20: Earth Tide, Seismology, Nucleation
17 Nov 2020
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In la in the first week of may. In la on wednesday mag > 8. What is a useful prediction? it must include . Interval of time when it will occur. An observable that we can make before every earthquake. Some of these may have been observed. But none have been observed before all before an earthquake earthquakesor even before many earthquakes. Yes, increased seismicity can lead to more seismicity. 100 quakes three mag units smaller, etc . But, can also lead to a larger mainshock . 1 in 20 california earthquakes are followed by a larger quake. Nine hours later a large earthquake struck destroying many homes but there was little loss of life. Failure: false alarm kwangtung province, august 1976. People slept in tents for nearly 2 months - no earthquake. More than 250,000 people died - one of the deadliest earthquakes. Butneed exact location of the earthquake to measure this change in velocity.
