Seismo Lab Brown Bag Seminar

Dynamic triggering occurs when seismic waves from large earthquakes induce seismic activity at distant faults, particularly when those faults are already close to failure. This process is one of the few measurable natural causes of earthquakes and offers a way to examine the state of stress in the Earth's crust. However, previous attempts to use dynamic triggering to track the evolution of these stresses have been limited by the availability of high-quality seismic datasets. While earlier methods involved cataloging earthquake rates, this approach is restricted by the completeness of available earthquake catalogs, and traditional methods of detecting seismic changes often miss the necessary subtlety required for dynamic triggering analysis.

This study introduces a method to directly observe dynamic triggering in Southern California using continuous seismic waveforms from 239 stations. By measuring triggering strains and extracting local signals, we can quantify the stresses that cause observable triggering to assess stress variations across time and space. Specifically, we focus on the Ridgecrest earthquake (MW 7.1) and its impact on the triggering intensity in Southern California. Additionally, our study can provide insights into the mechanism of dynamic triggering by analyzing the timing and frequency dependence of triggered events