Impact of complete Coulomb failure stress changes of the 2008 Xinjiang Yutian MS7.3 earthquake on the subsequent earthquakes
Ji Zhanbo
Wang Qiong
Wang Haitao
Xie Chaodi
Abstract：Based on the discrete-wavenumber method,we calculated the com-plete Coulomb failure stress (CFS)changes of near-field region induced by 21 March 2008,Yutian,Xinjiang,MS 7.3 earthquake,and analyzed their impact on the aftershocks.We also get the dynamic CFS changes of the Yutian earth-quake produced at the epicentral location of the Wuqia MS 6.8 earthquake on 5 October 2008.The calculated results show that the evolution of CFS change patterns lasted for almost 60 s,and trigger ratio of aftershocks by the main shock is above 90%.Dynamic CFS change patterns can better explain the distri-bution of aftershocks.Complete CFS changes results of aftershocks indicate that the dynamic CFS changes are far greater than static ones.The maximum dynamic CFS change at the epicenter of Wuqia earthquake is 0.12 MPa,sugges-ting that the Wuqia event may be triggered by dynamic Coulomb stresses induced by the Yutian event,but the triggering effect is unremarkable and static CFS changes have little influence on it.
Keywords：Yutian earthquakecomplete Coulomb failure stress changedynamic stress triggeringstatic stress triggering
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 997-1009 )