Research on Recent Tectonic Activity in North Area of Tianjin
Earthquake Administration of Tianjin Municipality, 19 Youyi Road, Tianjin 300201,China
Abstract By using the least-square method constrained by the co-seismic deformations of the Wenchuan earthquake derived from GPS, we inverse the slip models, with and without considering ramp-decollement separately. Based on the slip models obtained, we simulate the co-seismic gravity changes. The results show that the co-seismic horizontal deformation of the GPS stations and the gravity changes of the gravity stations modeled by the slip model with ramp-decollement are both closer to the actual measurements. This verifies that a large-scale nearly horizontal ramp-decollement,which existed at the southern part of the mid-fracture of the Longmenshan, has participated in the co-seismic slip of Wenchuan earthquake.
Key words :
Wenchuan earthquake
ramp-decollement
fault slip model
co-seismic deformation
co-seismic gravity changes
Received: 26 November 2014
Published: 01 December 2015
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