Japan Geoscience Union Meeting 2018

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[EJ] Oral

S (Solid Earth Sciences) » S-SS Seismology

[S-SS08] Active faults and paleoseismology

Tue. May 22, 2018 10:45 AM - 12:15 PM A07 (Tokyo Bay Makuhari Hall)

convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Hisao Kondo(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Ryosuke Doke(神奈川県温泉地学研究所, 共同), Nobuhisa Matsuta(Okayama University Graduate School of Education), Chairperson:Doke Ryosuke(Hot Springs Research Institute of Kanagawa Prefecture), Azuma Takashi

11:15 AM - 11:30 AM

[SSS08-14] Crustal movement on the south coast of Kii peninsula, southwest Japan

*Mitsuhisa Watanabe1 (1.Faculty of Sociology, Toyo University)

Keywords:marine terrace, flexure, back-facing fault scarplet, uplifted sessile assemblage, marine active fault

The raised marine terrace surfaces and the emerged sessile assemblages along the southern coast of the Kii Peninsula have the highest altitudes close to the Enshu-nada flexure and its westward extension. The mode of their height distribution is different from that of crustal movement accompanied with the Nankaido earthquake in 1946. In addition, terrace surfaces are bent to the sea back-facing fault scarplets on them in some places. These tectono-geomorphic features indicate that the unusual and eventual emergence of the coastal area has been caused not by plate boundary active faults but by the active flexure fringing the area.