Present-Day Crustal Stress Field from Gcmt Focal Mechanisms Based on the Slip Model.

Olaiz Campos, J. A.; Muñoz Martín, Alfonso; De Vicente Muñoz, Gerardo

Present-Day Crustal Stress Field from Gcmt Focal Mechanisms Based on the Slip Model.

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Olaiz_EAGE_Stress_2022_577.pdf (950.93 KB)

Official URL

https://doi.org/10.3997/2214-4609.202210577

Publication date

2022

Authors

Olaiz Campos, J. A.

Muñoz Martín, Alfonso

De Vicente Muñoz, Gerardo

Publisher

EAGE

Citations

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URI

https://hdl.handle.net/20.500.14352/2580

Abstract

The Slip Model is applied to the Global Centroid Moment Tensor database to determine the present day state of stress. Thus, from each focal mechanism the horizontal shortening direction (Dey) and the shape factor of the strain ellipsoid (k`), defined as the relationship between the maximum horizontal shortening and the vertical axis, are calculated. Additionally, this method proposed the neoformed plane from the calculated nodal planes. In this study, to determine the stress configuration at crustal scale, only depths < 40 km are included. Focal mechanisms are grouped in reverse, strike-slip and normal, to analyse its distribution and to determine the b-parameter from Gutenberg-Richter law. Finally, global shape factor and horizontal shortening direction maps are presented.