Report on the field tripsduring and after JpGU-AGU meeting, May 2017 byYujiro Ogawa

Two field trips were held, one during and another after the JpGU-AGU meeting, May 2017.

The first trip was held on 22ndof May 2017 for Boso Peninsula. We have four attendeesin addition to the leader Y. Ogawa, three from Republic of Korea, including Prof. KimYoung-Seogfrom Pukyong National University, Busan, and his two PhD students, and Chairman of IUGS TG Geohazard Dr. Yasukuni Okubo. We visited the active fault (Enmeiji fault), and coastal terraces of the southern tip of Boso Peninsula, which is one of the hazardous tectonic places of rapid uplifting rate. We also visited a large submarine slide deposts of Pliocene age. We finally visited the Nojima cape where isconnected with the main land during the last 1703 Genroku mega earthquake of subduction type (M 8.2).

Onthe Enmeiji active fault.

Large-scale submarinelandslide deposits of Pliocene age.

The second trip was held from26thof May to3rdof July with the vice-chairman of our TG, Prof. Y. Dilek from Miami University, lead by Y. Ogawa. We visited the coastal areas of Shikoku where historical mega-earthquakes attacked periodically every 200 to 400 years with the results of several coastal terraces. Government prepared many “tsunami towers” on the coast lines for refugees. Also there are many signals for the people when a large earthquake hits to notice the coming tsunamis topeople. We also mapped the accretionary prisms of Cretaceous to Miocene ages that were exhumed due to the Quaternary tectonics.We discussed on the tectonics and hazards with the researchers and students from Kochi University.We also visited theKochi Core Laboratory of JAMSTEC and University, and discussed onthe future plan against the geodisasters with the director of University Laboratory, Prof. H. Tokuyama.

Miocene accretionary prism and Kochi University researchers and students.

Tsunami tower at Aki.

Prof. Y. Dilek and Prof. H. Tokuyama, Kochi University Laboratory.

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