Could a Sumatra-like megathrust earthquake occur in the south Ryukyu subduction zone?

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Title:	Could a Sumatra-like megathrust earthquake occur in the south Ryukyu subduction zone?
Authors:	許樹坤;Lin, Jing-Yi;Sibuet, Jean-Claude;Hsu, Shu-Kun;Wu, Wen-Nan
Contributors:	地球科學學院地球科學學系
Keywords:	4. Seismology;Analogies;Earth and Environmental Science;Earth Sciences;Earthquakes;Fracture mechanics;Geology;Geophysics/Geodesy;Gravity anomalies;Intersections;Seismic activity;Seismicity;Subduction (geology);Tectonics
Date:	2014-01-01
Issue Date:	2026-04-23 11:30:53 (UTC+8)
Publisher:	Springer International Publishing AG;Berlin/Heidelberg: Springer Science and Business Media LLC
Abstract:	摘要： A comparison of the geological and geophysical environments between the Himalaya-Sumatra and Taiwan-Ryukyu collision-subduction systems revealed close tectonic similarities. Both regions are characterized by strongly oblique convergent processes and dominated by similar tectonic stress regimes. In the two areas, the intersections of the oceanic fracture zones with the subduction systems are characterized by trench-parallel high free-air gravity anomaly features in the fore-arcs and the epicenters of large earthquakes were located at the boundary between the positive and negative gravity anomalies. These event distributions and high-gravity anomalies indicate a strong coupling degree of the intersection area, which was probably induced by a strong resistance of the fracture features during the subduction. Moreover, the seismicity distribution in the Ryukyu area was very similar to the pre-seismic activity pattern of the 2004 Sumatra event. That is, thrust-type earthquakes with a trench-normal P -axis occurred frequently along the oceanward side of the mainshock, whereas only a few thrust earthquakes occurred along the continentward side. Therefore, the aseismic area located west of 128°E in the western Ryukyu subduction zone could have resulted from the strong plate locking effect beneath the high gravity anomaly zone. By analogy with the tectonic environment of the Sumatra subduction zone, the occurrence of a potential Sumatra-like earthquake in the south Ryukyu arc is highly likely and the rupture will mainly propagate continentward to fulfill the region of low seismicity (approximately 125° E to 129° E; 23° N to 26.5° N), which may generate a hazardous tsunami. 其他題名： Earth Planet Sp 出版者： Berlin/Heidelberg: Springer Science and Business Media LLC 出版日期： 2014-06-09 出處： Earth, Planets and Space, 2014-06, Vol.66 (1), p.1-8, Article 49 資源來源： Publicly Available Content Database 版權： Lin et al.; licensee Springer. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 版權： The Author(s) 2014 識別號： ISSN: 1880-5981 識別號： ISSN: 1343-8832 識別號： EISSN: 1880-5981 識別號： DOI: 10.1186/1880-5981-66-49
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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