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Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure

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Abstract

A cluster of earthquakes occurred in the Taiwan Shoal region on the outer rise of the Manila Trench. Although most were of small to medium magnitudes, one strong earthquake occurred on September 16, 1994. Several previous studies have provided important information to progress our understanding of this single earthquake. However, little is currently known about the earthquake cluster, and it is necessary to investigate the deep crustal structure of the Taiwan Shoal region to understand the mechanisms involved in controlling and generating it. This study presents a two-dimensional seismic tomographic image of the crustal structure along the OBS2012 profile based on ocean-bottom seismograph (OBS) data, which exhibits a high-velocity anomaly flanked by low-velocity anomalies in the upper crust beneath the Taiwan Shoal. In this study, 765 earthquakes (Richter magnitude ML > 1.5) occurring between 1991 and 2015 were studied and analyses of earthquake epicenters, regional faults, and the crustal structure provides an improved understanding of the nature of active tectonics in this region. Results of analyses indicate firstly that the high-velocity area represents major asperities that correspond to the location of the earthquake cluster and where stress is concentrated. It is also depicted that the earthquake cluster was influenced by fault interactions. However, the September 1994 earthquake occurred independently of these seismic activities and was associated with reactivation of a preexisting fault. It is also determined that slab pull is resisted by the exposed precollision accretionary prism, and the resistive force is causing accumulation of inplane compressive-stress. This may trigger a future damaging earthquake in the Taiwan Shoal region.

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Acknowledgements

OBS data were obtained during a shared voyage with the Natural Science Foundation of China in 2012. Earthquake data were provided by the data centers of the China National Seismic Network (http://www.csndmc.ac.cn/newweb/index.jsp) and the Guangdong Seismic Network (http://www.gdsin.net/). The bathymetric chart was plotted using Generic Mapping Tools (Wessel and Smith, 1995) and the 2008 version of the General Bathymetric Chart of the Ocean (GEBCO_08, from ‘The GEBCO_08 Grid, version 20090202’, http://www.gebco.net). This work is supported by the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA13010101) and the National Natural Science Foundation of China (Nos. 91328206, 41676042, 41376060, and 41506046).

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Wan, K., Sun, J., Xu, H. et al. Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure. J. Ocean Univ. China 17, 156–168 (2018). https://doi.org/10.1007/s11802-018-3443-8

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