Japan Geoscience Union Meeting 2016

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS34] The 2016 Kumamoto Earthquake and related crustal activities

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

5:15 PM - 6:30 PM

[MIS34-P43] Active fault in Aso area formed at the Kumamoto Earthquake and its relationship with neotectonics in the Southwestern Japan

*hisashi Oiwane1 (1.Mishimamura Village, Kagoshima Prefecture)

Keywords:Kumamoto Earthquake, Okinawa Trough, Beepu-Shimabara graben

I conducted geological survey in the Aso area about the faults that appear at the Kumamoto Earthquakes. I found 10 grabens in Akamizu - Uchinomaki area, which are bounded by ENE-WSW trending normal faults. Lengths of faults are about 100 m and the maximum displacement is ca. 2 m. These grabens compose NNE-SSW trending two segments with en echelon arrangement. Also, ENE-WSW trending grabens are found between the segments.
The arrangement of these grabens shows typical right-lateral strike slip displacement as a whole. It is most likely that these grabens are active fault that activated on the Earthquake. In this presentation, I discuss tectonic background of these a series of fault activities.