Baseline Correction of Strong-Motion Records of Wenchuan Ms 8.0 Earthquake and Its Primary Application on Dislocation Inversion
Shao Zhigang
Zhou Chaohui
Xu Jing
Zhang Yongjiu
Abstract：Based on the near-field strong-motion records,the distribution of peak acceleration near the Wenchuan Ms 8.0 earth-quake exists obvious hanging wall and directivity effect,it is consistent with the distribution of geological hazard caused by Wenchuan earthquake.However,among the crustal co-seismic velocities which are achieved by integrating the acceleration of Wenchuan Ms 8.0 earthquake recorded by strong motion seismograph,there is a typical linear offset for some stations,and there are also obvious nonlinear offsets besides linear offset for some other stations.Using the approach of nonlinear baseline correction to process co-seismic records of Wenchuan Ms 8.0 earthquake,the co-seismic displacement corrected by the nonlinear approach obviously is in better agreement with actual situation than the linear baseline correction approach.As a constraint of displacement processing results of strong-motion,GPS and InSAR,this paper inverts the distribution of co-seismic dislocation of Wenchuan Ms 8.0 earthquake.For the main co-seismic rupture fault of Wenchuan Ms 8.0 earthquake (Beichuan-Yingxiu fault),the inversion result of strong-motion is not only nicely characterize the detailed variation of distribution of co-seismic surface rupture on the main fault,but also well reflect the rupture attenuation on northernmost fault.The results show that, <br> strong-motion data could provide valuable results for post-seismic rescue and disaster assessment.In addition,due to data limi-tations,for the location distribution which inverted from displacement corrected by strong motion,only the southern section of Hanwang fault exists obvious dislocation.It reveals that we should emplace the strong motion seismographs relatively uniform around the potential seismogenic faults,in order to play a better role in the post-seismic emergency rescue.
Keywords：Wenchuan Ms 8.0 earthquakestrong-motionbaseline correctiondislocation inversionearthquake
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：12( 1903-1914 )