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Present-day kinematics of the Sundaland plate

  • Chien Zheng Yong ORCID logo EMAIL logo , Paul H. Denys ORCID logo and Christopher F. Pearson
Published/Copyright: July 13, 2017
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Abstract

Great earthquakes (≥M8.0) often cause widespread postseismic decay in areas well beyond any recognised plate boundaries. The Mw8.6 and 8.2 northern Sumatra doublet earthquakes occurred on 11 April 2012, near the intersection of the Indian, Australian and Sundaland plate, have caused an extensive coseismic offset and postseismic decay over the region. In this study, the long-term GPS time-series (1999–2014) suggests that the postseismic decay associated with the doublet earthquakes have had a significant effect on the eastern boundary of the Sundaland plate up to the western region of Peninsular Malaysia. Before the 2004 Mw9.1 Aceh and 2005 Mw8.6 Nias earthquakes, the average velocity of continuous GPS sites in Peninsular Malaysia is moving southeastward at 37±3.1mm/yr relative to the fixed Australian plate. The postseismic decay of these two great earthquakes has caused Peninsular Malaysia to experience elastic relaxation rebound into the south-southeast direction with a lower average velocity of 10±5.5mm/yr. After 2012 northern Sumatra earthquakes, Peninsular Malaysia returns to its original course of motion before the 2004 and 2005 earthquakes, with slightly lower average velocity at 25±2.4mm/yr. In this paper, the impact of coseismic and postseismic deformation of the 2012 Mw8.6 and 8.2 northern Sumatra earthquakes towards Sundaland plate vectors are discussed. A new rotation vector for the Sundaland plate is defined in ITRF2008 by using 10 selected cGPS sites that are assumed to be in the stable block, based on the 1999–2004 time-series data.

Funding statement: This work is financially supported by the University of Otago Doctoral Scholarship.

Acknowledgment

The authors would like to thank International GNSS Services (IGS), Center for Orbit Determination in Europe (CODE), Badan Informasi Geospasial (BIG), Indonesian Institute of Science (LIPI), National Mapping and Resource Information Authority (NAMRIA), Scripps Orbit and Permanent Array Centre (SOPAC), California Institute of Technology (Caltech) and Earth Observatory of Singapore (EOS) for maintaining and making the valuable GNSS data and processing parameters available. Special thanks to Department of Surveying & Mapping Malaysia (DSSM) for providing permanent GPS data from Malaysia under the copyright license No. JUPEM.BPK.18/4/16.10 (151) and JUPEM.BP.07.01.14 (63). This paper also benefited from a review by Sigrun Hreinsdóttir. Figures were generated using Generic Mapping Tools (GMT) software [21].

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Received: 2016-6-28
Accepted: 2017-5-23
Published Online: 2017-7-13
Published in Print: 2017-9-26

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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