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| | Abstract | | To better understand the shallow subsurface structure of the coastal area of the Suruga Bay, an ocean bottom gravity survey was conducted from late September to early October in 2013. The measurement points were arranged at an interval of 0.5 - 2km and the total number of them amounted to 50. No unnatural local anomalies by error data are found in the survey area, showing that the accuracy of the ocean bottom gravity data is acceptable. These newly measured ocean bottom gravity data were compiled with the existing gravity data. In a Bouguer anomaly map with an assumed density of 2.3 g/cm3, a gravity low elongated in the east-west direction lies offshore from Yui to Kambara areas. Its western and eastern edges seem to correspond to the southern extensions of the Iriyama Fault and Iriyamase Fault, respectively. In the Uchiura Bay, a gravity low is also distributed implying a basement low below the shelf. |
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