Andri Dian Nugraha^1,2, Jim Mori¹, Shiro Ohmi¹
1 Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji,  Japan
2 On leave from Faculty of Mining and Petroleum Engineering,  Institute of Technology Bandung, Indonesia

Abstract

We use a well determined three-dimensional attenuation model to infer the temperature distribution of the subduction zone in western Japan.  The tomographic attenuation model was derived from about 19,000 t* determinations for P- waves recorded at 128 stations. The attenuation model with a previously determined velocity model was used to infer the temperature distribution of the subduction zone from depths of 15 to 80 km, using the high temperature background method [Karato, 2003]. We can clearly see the cooler slab (400oC to 700oC) that is being subducted under the hotter mantle material (425^oC to 850^oC). We also show that the deep low-frequency earthquakes are occurring in regions just above the slab with temperatures of about 500^oC to 600^oC.

Geophysical Research Letters [2010, In Press]

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Andri Dian Nugraha^1,2, Jim Mori¹, Shiro Ohmi¹

¹Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji,  Japan

²On leave from Faculty of Mining and Petroleum Engineering,

Institute of Technology Bandung, Indonesia