Searching for hidden earthquakes in Southern California

Citation:
Ross, ZE, Trugman DT, Hauksson E, Shearer PM.  2019.  Searching for hidden earthquakes in Southern California. Science. 364:767-+.

Date Published:

2019/05

Keywords:

aftershocks driven, fault structure, landers, magnitude, mayor-cucapah earthquake, Science & Technology - Other Topics, seismicity, swarm, united-states, valley

Abstract:

Earthquakes follow a well-known power-law size relation, with smaller events occurring much more often than larger events. Earthquake catalogs are thus dominated by small earthquakes yet are still missing a much larger number of even smaller events because of signal fidelity issues. To overcome these limitations, we applied a template-matching detection technique to the entire waveform archive of the regional seismic network in Southern California. This effort resulted in a catalog with 1.81 million earthquakes, a 10-fold increase, which provides important insights into the geometry of fault zones at depth, foreshock behavior and nucleation processes, and earthquake-triggering mechanisms. The rich detail resolved in this type of catalog will facilitate the next generation of analyses of earthquakes and faults.

Notes:

n/a

Website

DOI:

10.1126/science.aaw6888