5:15 PM - 6:30 PM
[MIS34-P04] Focal mechanisms of 2016 Kumamoto earthquake activity and its relation to the stress field (preliminary report)
Keywords:2016Kumamoto earthquake, focal mechanisms, stress field
Generally, the earthquakes in strike-slip and normal fault types occurred around focal area, indicating maximum principal stress is similar magnitude to moderate one as suggested by the result of stress tensor inversion by Matsumoto et al. (2015). The focal mechanisms show spatial and temporal variation during the activity. The solution for main shock (M7.3) reveals different strike angle from centroid moment tensor solution by F-net (NIED). This suggests the mainshock rupture change its direction to the Futagawa fault.
In addition, the result is indicative of change in stress condition associated with the occurrence of the main shock (M7.3) around Futagawa and Hinagu faults.
We also used seismic waveform data at stations operated by Kyushu, Kyoto, Kagoshima Universities, JMA, and NIED. This study was supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, under its Earthquake and Volcano Hazards Observation and Research Program.This work is partly supported by MEXT KAKENHI Grant Number16H06298.