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| | Abstract | | In the year from 2009 to 2014, total geomagnetic and geological surveys by RV Bosei Maru, by School of Marine Science & Technology, Tokai University, were conducted in Suruga Bay located on the Pacific coast of central Japan. In the Suruga Bay area subducting Philippine Sea plate beneath SW Japan, we have some local magnetic anomalies in the overriding plate. A large thrust earthquake, referred to the Tokai earthquake, has been supposed soon to occur in this area (Ishibashi, 1981). The recent investigations of ship-borne survey conducted in this area are the geomagnetic anomaly data of the Hydrographic Department of the Maritime Safety Agency in 1997 and another data published by Honkura et al., 1999. The survey area in this study is 50 km x 35km in S-N and W-E directions, respectively. Total geomagnetic anomalies range from -200nT to +600nT. We carried out 2.5D inversion analyses for some positive high anomalies to reveal the dimensions of anomalous body, assuming uniform magnetization. As a result we present the features of those anomalous bodies in and around Suruga Bay. |
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