Toggle Main Menu Toggle Search

Open Access padlockePrints

Time-Dependent Afterslip of the 2009 Mw 6.3 Dachaidan Earthquake (China) and Viscosity beneath the Qaidam Basin Inferred from Postseismic Deformation Observations

Lookup NU author(s): Dr Yang Liu, Professor Zhenhong Li, Jiajun Chen



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


The 28 August 2009 Mw 6.3 Dachaidan (DCD) earthquake occurred at the Qaidam Basin’s northern side. To explain its postseismic deformation time series, the method of modeling them with a combination model of afterslip and viscoelastic relaxation is improved to simultaneously assess the time-dependent afterslip and the viscosity. The coseismic slip model in the layered model is first inverted, showing a slip pattern close to that in the elastic half-space. The postseismic deformation time series can be explained by the combination model, with a total root mean square (RMS) misfit of 0.37 cm. The preferred time-dependent afterslip mainly occurs at a depth from the surface to about 9.1 km underground and increases with time, indicating that afterslip will continue after 28 July 2010. By 334 days after the main shock, the moment released by the afterslip is 0.91 × 1018 N∙m (Mw 5.94), approximately 24.3% of that released by the coseismic slip. The preferred lower bound of the viscosity beneath the Qaidam Basin’s northern side is 1 × 1019 Pa·s, close to that beneath its southern side. This result also indicates that the viscosity structure beneath the Tibet Plateau may vary laterally.

Publication metadata

Author(s): Liu Y, Xu C, Li Z, Wen Y, Chen J, Li Z

Publication type: Article

Publication status: Published

Journal: Remote Sensing

Year: 2016

Volume: 8

Issue: 8

Online publication date: 10/08/2016

Acceptance date: 03/08/2016

Date deposited: 03/09/2016

ISSN (electronic): 2072-4292

Publisher: MDPI AG


DOI: 10.3390/rs8080649

Notes: This article belongs to the Special Issue Earth Observations for Geohazards.


Altmetrics provided by Altmetric


Funder referenceFunder name
2013CB733304State Key Development Program for Basic Research of China
201506275015China Scholarship Council
2015FY210400Special Project of Basic Work of Science and Technology
41404007National Natural Science Foundation of China
41274030National Natural Science Foundation of China
41431069National Natural Science Foundation of China
NE/K010794/1UK Natural Environmental Research Council (NERC)
NE/N012151/1UK Natural Environmental Research Council (NERC)