An estimation of the absolute stress value for the Landers earthquake source region

Y. G. Wan, S. Z. Sheng, T. L. Lin, Y. M. Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We estimate the absolute stress value at the earthquake source region of a small cubic area in Homestead valley fault segment which broke during the Landers earthquake, using seismic stress drop and rotations of stress axes during the event.We obtained the pre-seismic compressive, intermediate and extensional principal stress values as 323, 319 and 312MPa in the depth of 8∼12 km. The shear stresses on the fault plane before and after the event are 6MPa and 1MPa respectively. The results show that normal stress increased after the earthquake, which helps to terminate the rupture process. The pre-seismic shear-stress is greater than that after the quake and their differences roughly correspond to the seismic stress drop. The post-seismic shear-stress is positive, which means no overshooting in co-seismic slip. The differential stress value is less than the absolute stress value, and the shear stress is also relatively small.

Original languageEnglish
Title of host publicationRock Stress and Earthquakes - Proceedings of the 5th International Symposium on In-Situ Rock Stress
Pages223-228
Number of pages6
Publication statusPublished - 2010 Dec 1
Event5th International Symposium on In-Situ Rock Stress, ISRSV 2010 - Beijing, China
Duration: 2010 Aug 252010 Aug 27

Publication series

NameRock Stress and Earthquakes - Proceedings of the 5th International Symposium on In-Situ Rock Stress

Other

Other5th International Symposium on In-Situ Rock Stress, ISRSV 2010
CountryChina
CityBeijing
Period10-08-2510-08-27

All Science Journal Classification (ASJC) codes

  • Geology
  • Geotechnical Engineering and Engineering Geology

Fingerprint Dive into the research topics of 'An estimation of the absolute stress value for the Landers earthquake source region'. Together they form a unique fingerprint.

Cite this