Stress field estimation based on focal mechanisms and back projected imaging in the Eastern Llanos Basin (Colombia)

2016 ◽  
Vol 71 ◽  
pp. 320-332 ◽  
Author(s):  
Sebastián Gómez-Alba ◽  
Carlos Eduardo Fajardo-Zarate ◽  
Carlos Alberto Vargas
Keyword(s):  
Stress Field ◽  
Focal Mechanisms ◽  
Field Estimation

Direct stress field estimation through waveform matching

2020 ◽  
Vol 221 (2) ◽  
pp. 843-856
Author(s):  
Wenhuan Kuang ◽  
Jie Zhang
Keyword(s):  
Stress Field ◽  
Focal Mechanism ◽  
Stress Pattern ◽  
P Wave ◽  
Local Source ◽  
Stress Inversion ◽  
Inversion Process ◽  
Physical Relationship ◽  
New Approach ◽  
Field Estimation

SUMMARY Conventionally, the routine workflow of stress field estimation from seismic data consists of two steps: focal mechanism inversion and stress inversion. This two-step workflow suffers from the cumulative uncertainties of both the focal mechanism inversion process and the stress inversion process. To mitigate the cumulative errors, a few previous studies have put efforts to directly estimate the stress field using P-wave polarities. In this study, we develop a new approach to directly estimate tectonic stress fields with better accuracy through waveform matching. This new approach combines the two steps into a one-step workflow to mitigate the cumulative uncertainties through the physical relationship between a stress field and the recorded waveforms. This method assumes a homogeneous stress field in space in the local source region and that the fault slip occurs in the direction of the resolved shear stress acting on the fault plane. Under these assumptions, the stress pattern that generates the theoretical waveforms that best fit the waveforms observed is directly retrieved as the true stress field. The merits of the new approach include that this approach can mitigate the cumulative uncertainties suffered from the conventional two-step workflow and does not require determination of the focal mechanisms of each event; thus, this method is applicable to data sets with few stations. Synthetic tests with and without noise are conducted to demonstrate the performance and merits of this method. Then, the new approach is applied to a real data set from central Oklahoma between March 2013 and March 2016. The resulting stress pattern is consistent with that estimated from previous studies examining the same region. These applications show the benefits and validity of the new approach.

scholarly journals Focal mechanisms and stress field in the Atotsugawa fault area, central Honshu, Japan

2010 ◽  
Vol 62 (4) ◽  
pp. 367-380 ◽  
Author(s):  
Kei Katsumata ◽  
◽  
Masahiro Kosuga ◽  
Hiroshi Katao
Keyword(s):  
Stress Field ◽  
Focal Mechanisms ◽  
Atotsugawa Fault

scholarly journals The Crustal Stress Field Inferred from Focal Mechanisms in Northern Chile

2021 ◽  
Author(s):  
Carlos Herrera ◽  
John F. Cassidy ◽  
Stan E. Dosso ◽  
Jan Dettmer ◽  
Wasja Bloch ◽  
...  
Keyword(s):  
Stress Field ◽  
Focal Mechanisms ◽  
Northern Chile ◽  
Crustal Stress ◽  
Crustal Stress Field
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