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Estimation of interplate coupling in the Nankai trough, Japan using GPS data from 1996 to 2006

Liu, Zhen and Owen, Susan and Dong, Danan and Lundgren, Paul and Webb, Frank and Hetland, Eric and Simons, Mark (2010) Estimation of interplate coupling in the Nankai trough, Japan using GPS data from 1996 to 2006. Geophysical Journal International, 181 (3). pp. 1313-1328. ISSN 0956-540X.

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We used three-component surface velocities in southwest Japan to estimate plate coupling on the subducting plate interface at the Nankai trough. We analyzed continuous GPS data from the Japanese GEONET network from 1996 to 2006 using a consistent analysis strategy that generates bias-fixed solutions for the entire network. We applied systematic time-series analysis methods to estimate common mode error, which improved position solutions for the entire network. To allow for differences in regional deformation sources, we modelled the plate coupling on the plate interface beneath Shikoku island to Kii Peninsula and the Tokai-Suruga trough separately. The results show strong coupling at a depth of ~10–30 km off Shikoku and Kii Peninsula. The spatial variation in plate coupling coincides well with the coseismic rupture zones of the past large earthquakes. Maximum slip deficit rates of ~2–3 cm yr^(−1) at the depth of ~5–25 km are found beneath the Tokai area, consistent with results from other studies. The downdip limits of the highly coupled areas and transition zones beneath Shikoku and the Kii Peninsula correspond approximately to estimates of the 450 °C isotherms. Good correlation is observed between the lateral variations of the slip deficit distribution, low frequency earthquakes, and coseismic slip. This correlation suggests that temperature, and possibly fluid variations, contribute to such correlation in space. The interplate slip deficit derived from the GPS velocities over the 10 yr of observations is generally compatible with the results over shorter time spans, suggesting that plate coupling in SW Japan does not change significantly over the period of these GPS measurements.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Liu, Zhen0000-0002-6313-823X
Lundgren, Paul0000-0002-6771-2876
Simons, Mark0000-0003-1412-6395
Additional Information:© 2010 RAS. Journal compilation © 2010 RAS. Accepted 2010 March 14. Received 2010 February 2; in original form 2009 July 7. We thank K. Wang and Junichi Nakajima for sending us their composite plate geometry model for the Philippine Sea slab. We thank Akio Katsumata at Meteorological Research Institute, Japan for providing us low frequency earthquake catalogue. We also thank GSI for providing us the raw data of GEONET. Reviews by J. Freymueller, L. Wallace, and editor J. Beavan improved this manuscript. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration and funded through the internal Research and Technology Development Program. This research was supported in part by the Gordon and Betty Moore Foundation. This is Caltech Tectonic Observatory Contribution 109.
Group:Caltech Tectonics Observatory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:Satellite geodesy; Seismicity and tectonics; Subduction zone processes
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Other Numbering System NameOther Numbering System ID
Caltech Tectonic Observatory109
Issue or Number:3
Record Number:CaltechAUTHORS:20100609-080931797
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18609
Deposited By: Tony Diaz
Deposited On:09 Jun 2010 16:36
Last Modified:03 Oct 2019 01:45

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