Japan Geoscience Union Meeting 2016

Presentation information


Symbol O (Public) » Public

[O-02] Poster presentations by senior high school students

Sun. May 22, 2016 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Miwa Kuri(International Research Institute of Disaster Science, Tohoku University), Keiko Konya(Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Kou Yamada(Waseda University)

1:45 PM - 3:15 PM

[O02-P10] Search of the Fukui Earthquake Faults

*Naruki Ishida1, *Ryosuke Kokado1, *Takaki Shimizu1, *Hirokazu Fujita1, *Einosuke Honda1 (1.Fujishima High School)

Keywords:Hypocenter determination, S wave splitting, crack, Trapped waves

We have studied about the Eastern Margin active fault zone of the Fukui Plain (hereinafter referred to as 'the fault zone.')
First, we measured seismic wave-form by seismometers arranged in 5 high schools (Fujishima, Kanazu, Sakai, Mikuni, Maruoka; especially, Kanazu and Sakai are on the fault zone.) and investigated the arrival time of P and S-wave at the five observation points. We could determine where the hypocenter is through this process.
Then, we analyzed the S-wave splitting using hodographs of the horizontal motions. As a result, we discovered extraordinary S-wave splitting at Kanazu.
Also, we are succeeded in observing earthquakes whose hypocenter are on the northern or southern extension of the fault zone. Analyzing these earthquakes, we found the remarkable subsequent wave after the arrival of the S-wave to Sakai and Kanazu.
From these things we guessed that there are fault fracture zones between the main part of the fault zone and the western part of it, and there are developed cracks in the northern part of the fault zone, too.