Remote Dynamic Triggering of Multiple Fault Structures in Oklahoma

Session: Seismicity and Tectonics of Stable Continental Interiors [Poster]
Type: Poster
Date: 4/30/2020
Time: 08:00 AM
Room: Ballroom
Description: 

Induced seismicity, earthquakes caused by anthropogenic activity, has increased significantly in the last several years resulting from practices related to oil and gas production. Large earthquakes have been shown to promote the triggering of events due to static stresses caused by physical movement along the fault and also remotely from the passage of seismic waves (dynamic triggering). In order to understand the mechanisms leading to earthquake failure, we investigate a region where natural, induced and dynamically triggered events occur, Oklahoma. We analyze ~9 years of data (2010-2019) from the Oklahoma Seismic Network, EarthScope's USArray Transportable Array (TA) and temporary local networks. We implement an optimized STA/LTA detector to develop local detection and earthquake catalogs. We investigate 155 teleseismic earthquakes with M ≥ 7 and flag events that significantly increase seismicity throughout Oklahoma following the arrival of the teleseismic P-wave. We examine triggered seismicity leading up to major earthquakes in Oklahoma and observe patterns of triggered seismicity indicative of evolving stress-state leading up to large earthquake failures. Using our observations of triggered seismicity, we aim to identify critically stressed regions throughout Oklahoma.

Presenting Author: Richard A. Alfaro-Diaz

Authors