TY - JOUR
T1 - Deep structure of the Japan subduction zone
AU - Abdelwahed, Mohamed F.
AU - Zhao, Dapeng
N1 - Funding Information:
The authors wish to thank the National Research Institute for Earth Sciences and Disaster Prevention (NIED) and the J-array seismic network for providing the high-quality data used in this study. We wish to thank F. Ochi for providing the teleseismic data she collected. Some figures in this paper were produced by using the Generic Mapping Tools (GMT) software written by Wessel and Smith (1995) . We are grateful to Dr. O.P. Mishra for reading the manuscript and providing us with helpful comments. Prof. G. Helffrich and two anonymous reviewers provided thoughtful comments which improved the manuscript. This work was partially supported by research grants (Kiban-B 11440134 and Kiban-A 17204037) to D. Zhao from the Japanese Ministry of Education and Science.
PY - 2007/6/15
Y1 - 2007/6/15
N2 - We determined 3-D P-wave velocity structure down to 700 km depth under the Japan Islands using a large number of arrival time data from local and teleseismic events simultaneously. We collected 207,000 arrival times from 7743 shallow and deep earthquakes occurred in and around Japan and 34,148 data from 333 teleseismic events, which were recorded by over 1000 seismic stations on the Japan Islands. Our tomographic model revealed some new features. The Philippine Sea slab is found to subduct down to 500 km depth under southwest Japan though the seismicity within the slab ends at 150-200 km depth. Significant low-velocity anomalies are found to exist in the deep portion of the mantle wedge above the Pacific slab, which may be caused by the deep dehydration process of the slab. Slow anomalies are detected in the mantle beneath the Pacific slab, which may be caused by a mantle plume or upwelling of hot mantle materials associated with the deep subduction of the Pacific slab and its collapsing down to the lower mantle.
AB - We determined 3-D P-wave velocity structure down to 700 km depth under the Japan Islands using a large number of arrival time data from local and teleseismic events simultaneously. We collected 207,000 arrival times from 7743 shallow and deep earthquakes occurred in and around Japan and 34,148 data from 333 teleseismic events, which were recorded by over 1000 seismic stations on the Japan Islands. Our tomographic model revealed some new features. The Philippine Sea slab is found to subduct down to 500 km depth under southwest Japan though the seismicity within the slab ends at 150-200 km depth. Significant low-velocity anomalies are found to exist in the deep portion of the mantle wedge above the Pacific slab, which may be caused by the deep dehydration process of the slab. Slow anomalies are detected in the mantle beneath the Pacific slab, which may be caused by a mantle plume or upwelling of hot mantle materials associated with the deep subduction of the Pacific slab and its collapsing down to the lower mantle.
KW - Mantle convection
KW - Pacific slab
KW - Philippine Sea slab
KW - Seismic tomography
KW - Slab dehydration
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U2 - 10.1016/j.pepi.2007.03.001
DO - 10.1016/j.pepi.2007.03.001
M3 - Article
AN - SCOPUS:34250336359
SN - 0031-9201
VL - 162
SP - 32
EP - 52
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
IS - 1-2
ER -