Dynamic Triggering and the State of Stress in Oklahoma
Session: Mechanisms of Induced Seismicity: Pressure Diffusion, Elastic Stressing and Aseismic Slip [Poster]
Type: Poster
Date: 4/20/2021
Presentation Time: 04:15 PM Pacific
Description:
Induced seismicity has increased significantly in Oklahoma resulting from massive wastewater injection. Oklahoma has been subjected to several M ≥ 5 earthquakes including the Prague, Cushing, Fairview, and Pawnee earthquakes. In order to understand the mechanisms leading to earthquake failure, we examine seismicity leading up to these moderate earthquakes in Oklahoma and search for earthquake-triggering incited by natural transient stresses generated by the seismic waves of large remote earthquakes. We analyze ~7 years of data (2010-2016) from the Oklahoma Seismic Network, EarthScope's USArray Transportable Array (TA), and temporary local networks. We investigate 957 teleseismic earthquakes wit M ≥ 6 and flag events that significantly increase seismicity throughout Oklahoma following the arrival of the teleseismic wave arrivals. We observe patterns of triggered seismicity indicative of evolving stress-state leading up to several large earthquake failures.
Presenting Author: Richard A. Alfaro-Diaz
Student Presenter: No
Authors
Richard Alfaro-Diaz Presenting Author Corresponding Author raalfarodiaz@lanl.gov Los Alamos National Laboratory |
Ting Chen tchen@lanl.gov Los Alamos National Laboratory |
Xiaofei Ma xfma@lanl.gov Los Alamos National Laboratory |
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Dynamic Triggering and the State of Stress in Oklahoma
Category
Mechanisms of Induced Seismicity: Pressure Diffusion, Elastic Stressing and Aseismic Slip