@article{58e7b7fca5e44bf59b5b99b0a1203a7f,
title = "Seismic imaging of the Amur-Okhotsk plate boundary zone in the Japan Sea",
abstract = "We determined high-resolution images of P and S wave velocity and Poisson's ratio under the Japan Sea off Honshu Island using a large number of arrival-time data from local earthquakes to understand the interaction of the Amur and Okhotsk plates. Our new data collected from the crustal earthquakes under the Japan Sea relocated precisely with sP depth phase are crucial to make this work possible. Our results show that strong lateral heterogeneities exist in the crust and upper mantle under the Amur-Okhotsk plate boundary zone, which may have affected the seismotectonics in the region. The crustal velocity variations under the Japan Sea may reflect the complicated geologic structures that were produced during the opening of the Japan Sea and the present compressional stage of the Honshu arc associated with the collision of the Amur plate with the Okhotsk plate. Low-velocity zones in the mantle wedge are found to extend westward under the Japan Sea, rather than just confined under Honshu Island, suggesting that the back-arc magmatism and tectonics are part of the complex geodynamic system in East Asia.",
keywords = "Earthquakes, Japan Sea, SP depth phase, Slab dehydration, The Amur plate, The Okhotsk plate",
author = "Dapeng Zhao and Zhouchuan Huang and Norihito Umino and Akira Hasegawa and Takeyoshi Yoshida",
note = "Funding Information: We thank the data center of the Kiban seismic network and the JMA unified catalog for providing the high-quality waveform and arrival-time data used in this study. This work was supported partially by a grant (Kiban-A 17204037) from Japan Society for the Promotion of Science and a grant from the Fund Managing Center for Japan Nuclear Power Environment Studies. Most of the figures were made by using the Generic Mapping Tools ( Wessel and Smith, 1991 ). In a personal communication with D. Zhao on April 20, 2010, Prof. Y. Kobayashi kindly provided information on his 1983 proposal concerning the nascent plate boundary in the eastern margin of the Japan Sea. We thank Lucy Liu and L. Wang for helpful discussions. We are very grateful to Prof. G. Helffrich (editor), Dr. M. Matsubara and an anonymous reviewer who provided thoughtful review comments on the manuscript, which improved the present work.",
year = "2011",
month = sep,
doi = "10.1016/j.pepi.2011.06.013",
language = "English",
volume = "188",
pages = "82--95",
journal = "Physics of the Earth and Planetary Interiors",
issn = "0031-9201",
publisher = "Elsevier",
number = "1-2",
}