Name: MIYATAKE, Takashi
Position:Associate Professor
Division/Center: Division of Theoretical Geoscience
Research Area: Seismology

Last Update 11/06 2014

Research:

Several tomographical studies have reported that high-velocity bodies coincide with asperities. However, it remains unclear whether crust heterogeneity generates such asperities. This question can be addressed by conducting a stress analysis. The 2004 Chuetsu, Japan, earthquake is an extremely attractive stress analysis candidate because a detailed three-dimensional (3D) seismic velocity structure of the source region was elucidated. Using the resulting structural model, we numerically calculated the heterogeneous stress distribution, and then added tectonic loading and found that the asperity region for the above slip distribution corresponds approximately to that of the kinematic model, which suggests that the asperity may have been created by heterogeneity in the crustal structure.

Publications:

µÜÉð¡¡Î´¡¤»°Â𹰷á¤ÌÚ¼Éð»Ö¡¤¶ù븬°ì, û¼þ´üÃϿ̤ÎÀ®°ø¤Ë¤Ä¤¤¤Æ¤Î¹Í»¡, ÃÏ¿Ì2, 61, 2, 91--97, 2008.

Miyatake, T, The effect of heterogeneous crust on earthquakes: a case study of the 2004 Chuetsu, Japan earthquake, Earth Planets Space, 66, 18, doi:10.1186/1880-5981-66-18, , 2014.