Abstract
The 1983 Nihonkai-Chubu earthquake (M7.7), 1993 Hokkaido Nansei-oki earthquake (M7.8) and other large earthquakes over M7, triggered by reverse fault mechanisms, have occurred along the eastern margin of the Japan Sea. However, the relationship between this earthquake and the crustal structure is not very clear, because the amount of seismic exploration data is very limited. From 2009 to 2012, we conducted the research of marine seismic surveys using a multichannel seismic system (MCS) and the ocean-bottom seismographs (OBSs) with the research vessels of the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). This research was collaborated with “Multidisciplinary research project for construction of fault model in the high strain rate zone” of the Ministry of Education, Culture, Sports, Science, and Technology of Japan. In this research, seismic data using MCS were acquired along 43 lines in the region covered from the coast of the Japan Sea to the Yamato Basin and the Japan Basin. In this report, we describe data acquisition and the result of data processing on MCS survey.
