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- Title
Tomographic image of crust and upper mantle off the Boso Peninsula using data from an ocean-bottom seismograph array.
- Authors
Ito, Aki; Yamamoto, Yojiro; Hino, Ryota; Suetsugu, Daisuke; Sugioka, Hiroko; Nakano, Masaru; Obana, Koichiro; Nakahigashi, Kazuo; Shinohara, Masanao
- Abstract
We determined the three-dimensional structure of the crust and upper mantle off the Boso Peninsula, Japan, by analyzing seismograms recorded by ocean-bottom seismometers and land stations between 2011 and 2013. We employed seismic tomography to determine the P- and S-wave velocity structures and earthquake locations simultaneously. The tomographic image shows that the mantle parts of the Pacific and the Philippine Sea plates have high-velocity anomalies. The upper boundary of the Philippine Sea plate is delineated as approximately 2-6 km shallower than that previously estimated from land-based data for the area 140.5°E-141.5°E and 35°N-35.5°N. A pronounced low-velocity anomaly in P- and S-waves with low- V / V ratio (1.5-1.6) was observed at depths shallower than 20 km in the overriding North American plate. This anomaly may be caused by the presence of rocks with a low- V / V ratio, such as quartzite, and the water expelled from the subducted Pacific and Philippine Sea plates.
- Subjects
TOMOGRAPHY; SEISMIC arrays; SEISMOMETERS; EARTHQUAKES; SEISMIC tomography
- Publication
Earth, Planets & Space, 2017, Vol 69, Issue 1, p1
- ISSN
1343-8832
- Publication type
Letter
- DOI
10.1186/s40623-017-0703-6