Dynamic Triggering in the Geysers Geothermal Field by Two Recent Large Earthquakes
Description:
Dynamic triggering is widely recognized and validated around the world, and is especially common in geothermal and volcanic regions with high background seismic activity. Study on the interaction of remote large earthquakes and locally industrial activities (e.g., geothermal production) can provide insights on the earthquake nucleation process, and may also benefit induced earthquake forecasting and associated seismic hazard management. In this work, we investigate dynamic triggering phenomenon in The Geysers geothermal field associated with two recent large earthquakes in California, the 2019 Ridgecrest Mw 7.1 earthquake and the 2024 Mendocino Mw 7.0 earthquake. We use deep learning-based workflows to build the microseismic catalog and further estimate the local magnitudes. Seismicity rates increase immediately after the arrival of S-wave, with β-value reaching 10 and 40 for the 2019 and 2024 earthquakes, respectively, suggesting that dynamically triggered earthquakes occurred widely in the geothermal field. Due to the difference in the origin (e.g., distance and direction) of the large earthquakes, the triggered sequences show different characteristics in seismicity rate variation, spatial distribution, and earthquake magnitude. Notably, the 2024 Mendocino Mw 7.0 event triggered two moderate earthquakes (ML 3.6 and ML 4.3) within 2 minutes in the northwestern part of the geothermal field, which are among the largest earthquakes in this region. A detailed comparison of dynamic triggering by the two different earthquakes reveals distinct triggered earthquake sequences and sheds light on the physical triggering mechanisms behind them.
Session: Mechanistic Insights into Fluid-induced Earthquakes from the Laboratory to the Field [Poster]
Type: Poster
Date: 4/15/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Lei
Student Presenter: No
Invited Presentation:
Poster Number: 98
Authors
Lei Li Presenting Author Corresponding Author leileely@126.com Central South University |
Yifan Yu yuyifan@stanford.edu Stanford University |
Gregory Beroza beroza@stanford.edu Stanford University |
William Ellsworth wellsworth@stanford.edu Stanford University |
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Dynamic Triggering in the Geysers Geothermal Field by Two Recent Large Earthquakes
Category
Mechanistic Insights into Fluid-induced Earthquakes from the Laboratory to the Field