@article{a83ece3a844a458a8269518cf65c4520,
title = "Genesis of Intermediate-Depth and Deep Intraslab Earthquakes beneath Japan Constrained by Seismic Tomography, Seismicity, and Thermal Modeling",
abstract = "The distribution of intermediate-depth and deep intraslab earthquakes with respect to subducting slabs offers a unique insight into seismogenesis at high pressures and temperatures that should inhibit brittle failure. This study constrains the surface of the subducting Pacific Plate beneath Japan at depths between 100 and 380 km based on a previous continental-scale adjoint tomography model. Earthquake distributions relative to the slab surface reveal double seismic zones located within the top 60 km of the Pacific Plate. Thermal modeling suggests that the lower-plane seismicity corresponds to temperatures between 400 and 900 °C. The seismogenic pressure and temperature conditions correlate approximately with the conditions of dehydration reactions of several hydrous minerals, that is, antigorite (serpentine) and chlorite at depths between 100 and 200 km and phase A at greater depths between 200 and 380 km. These correlations indicate that at these depths water released from dehydration processes may facilitate triggering slab mantle earthquakes.",
keywords = "Japan and North Izu, adjoint tomography, double seismic zone, fluid-related embrittlement, intermediate-depth and deep earthquakes, seismogenesis",
author = "Min Chen and Manea, {Vlad Constantin} and Fenglin Niu and Wei, {S. Shawn} and Eric Kiser",
note = "Funding Information: We thank the Editor (Jeroen Ritsma) and two anonymous reviewers for their constructive and insightful comments that helped improve the manuscript. We also thank one of the reviewers for providing the sentence on apparent slab gaps in tomographic models. The EHB catalog hypocenter location data were downloaded from the International Seismological Centre website (http://www.isc.ac.uk/ehbbulletin/search/catalogue/). We thank the High Performance Computing Center (HPCC) at Michigan State University, the Extreme Science and Engineering Discovery Environment (XSEDE supported by NSF grant ACI-1053575), and the National Laboratory for Advanced Scientific Visualization at UNAM (LAVIS) for providing the computational resources. Model EARA2014 used in this study is provided as supporting information dataset of this publication. We thank Susannah Dorfman, Yingcai Zheng, Zhongwen Zhan, Lijun Liu, Lingsen Meng, Saeko Kita, and Keishi Okazaki for their constructive discussion and suggestion. This research was supported by NSF grant 1802247, Romanian MNESR-STAR grant 513, and JST-JICA SATREPS grant 1554361. Funding Information: We thank the Editor (Jeroen Ritsma) and two anonymous reviewers for their constructive and insightful comments that helped improve the manuscript. We also thank one of the reviewers for providing the sentence on apparent slab gaps in tomographic models. The EHB catalog hypocenter location data were downloaded from the International Seismological Centre website (http:// www.isc.ac.uk/ehbbulletin/search/ catalogue/). We thank the High Performance Computing Center (HPCC) at Michigan State University, the Extreme Science and Engineering Discovery Environment (XSEDE supported by NSF grant ACI‐1053575), and the National Laboratory for Advanced Scientific Visualization at UNAM (LAVIS) for providing the computational resources. Model EARA2014 used in this study is provided as supporting information dataset of this publication. We thank Susannah Dorfman, Yingcai Zheng, Zhongwen Zhan, Lijun Liu, Lingsen Meng, Saeko Kita, and Keishi Okazaki for their constructive discussion and suggestion. This research was supported by NSF grant 1802247, Romanian MNESR‐STAR grant 513, and JST‐JICA SATREPS grant 1554361. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = feb,
day = "28",
doi = "10.1029/2018GL080025",
language = "English (US)",
volume = "46",
pages = "2025--2036",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley and Sons Inc.",
number = "4",
}