No Significant Effect of Coulomb Stress on the Gutenberg-Richter Law after the Landers Earthquake
Navas-Portella, Víctor (Centre de Recerca Matemàtica)
Jiménez, Abigail (Universidad de Granada. Departamento de Ciencias de la Computación e Inteligencia Artifificial)
Corral, Álvaro (Universitat Autònoma de Barcelona. Departament de Matemàtiques)

Data:	2020
Resum:	Coulomb-stress theory has been used for years in seismology to understand how earthquakes trigger each other. Whenever an earthquake occurs, the stress field changes, and places with positive increases are brought closer to failure. Earthquake models that relate earthquake rates and Coulomb stress after a main event, such as the rate-and-state model, assume that the magnitude distribution of earthquakes is not affected by the change in the Coulomb stress. By using different slip models, we calculate the change in Coulomb stress in the fault plane for every aftershock after the Landers event (California, USA, 1992, moment magnitude 7. 3). Applying several statistical analyses to test whether the distribution of magnitudes is sensitive to the sign of the Coulomb-stress increase, we are not able to find any significant effect. Further, whereas the events with a positive increase of the stress are characterized by a much larger proportion of strike-slip events in comparison with the seismicity previous to the mainshock, the events happening despite a decrease in Coulomb stress show no relevant differences in focal-mechanism distribution with respect to previous seismicity.
Ajuts:	Ministerio de Economía y Competitividad MDM-2014-0445 Ministerio de Economía y Competitividad FIS2015-71851-P Ministerio de Economía y Competitividad FIS-PGC2018-099629-B-I00 Ministerio de Economía y Competitividad MAT2015-69777-REDT
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Geophysics ; Seismology
Publicat a:	Scientific reports, Vol. 10 (February 2020) , art. 2901, ISSN 2045-2322

DOI: 10.1038/s41598-020-59416-2
PMID: 32075986

13 p, 2.7 MB

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