This record is being processed for inclusion into GeoRef. It may not yet have been indexed, given a translated title, or checked by a GeoRef editor.

Coseismic displacement caused by the 2008 great Wenchuan earthquake derived from various types of geodetic data

Saved in:
Online Access: Get full text
doi: 10.6038/j.issn.0001-5733.2012.08.009
Authors:Yang Shaomin; Lan Qigui; Nie Zhaosheng; Wang Qingliang; Li Heng; Liao Hua; Tan Kai; Qiao Xuejun; Wang Qi
Author Affiliations:Primary:
China Earthquake Administration, Institute of Seismology, Wuhan, China
China University of Geosciences, China
Sichuan Administration of Surveying Mapping and Geoinformation, China
Sichuan Earthquake Administration, China
Volume Title:Diqiu Wulixue Bao Acta Geophysica Sinica
Source:Diqiu Wulixue Bao = Acta Geophysica Sinica, 55(8), p.2575-2588. Publisher: Science Press, Beijing, China. ISSN: 0001-5733
Publication Date:2012
Note:In Chinese with English summary. 44 refs.; illus.
Summary:We analyze the co-seismic surface displacement field produced by the 2008 Wenchuan (Mw7.9) earthquake using various geodetic data including GPS measurements and SAR images combined with other data such as leveling, gravity, and near-field strong motion records. The GPS data are from resurveys of several high-precision GPS networks and a triangulation network. Co-seismic displacements at GPS sites are estimated to within 2 cm and triangulation points within 6-8 cm. Two kinds of SAR data are used in this paper: light-of-sight SAR interferograms with a precision better than 8 cm and three-dimensional surface displacements using SAR sub-pixel correlation to within 0.5 meters. The co-seismic displacements constructed by various types of data are characterized by the deformation pattern of coherent motion in the footwall and the anticlockwise rotation of the hanging wall. The site's horizontal offsets in the Sichuan Basin are directed toward the epicenter. Otherwise, the GPS sites in Wenchuan, Lixian, and Maoxian along the Longmen Mountains moved normal to the surface rupture. However, the GPS sites in Pingwu and Qingchuan were displaced initially parallel to and finally away from the rupture zone, which is consistent with the rupture mechanism of thrust-slip and right lateral strike-slip faulting. Meanwhile, the hanging wall uplifted significantly and the subsidence of the footwall localaized near the rupture zone. The far-field uplift in the Sichuan Basin is found with a hinge line (separating uplift from subsidence) parallel to the Longquan fault. Finally, we test seismological slip models by fitting the co-seismic displacement field, from which a mean misfit of 40-50 cm is derived for GPS sites within 50 km of the rupture zone, and 5 cm for sites in the far-field.
Subjects:Coseismic processes; Displacements; Earthquakes; Faults; Geodesy; Geodetic networks; Global navigation satellite systems; Global Positioning System; Great earthquakes; Neotectonics; SAR; Seismotectonics; Strike-slip faults; Tectonics; Thrust faults; Wenchuan earthquake 2008; Asia; China; Far East; Longmenshan fault zone; Sichuan China; Wenchuan China; Longquan Fault
Coordinates:N311323 N311323 E1031948 E1031948
Record ID:710910-5
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
Tags: Add Tag
No Tags, Be the first to tag this record!