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We conducted a multi-beam bathymetry, gravity, and magnetic survey of the Horeki seamount in the Izu-Bonin arc, the western Pacific. On the basis of gravity anomaly, the flanks of the Horeki seamount are consistent with higher density anomaly. On the other hand, low density anomaly is distributed parallel to the long axis in the top part of the seamount. The prominent circular low Bouguer gravity anomaly, appeared in the northern part of flat-topped summit, indicates light density material filling the flat-topped summit. From the aspect of magnetic anomaly, the main body of the seamount is magnetized in positive. The magnetization indicates the volcanism constructed the main body is most robust in Gauss normal magnetic epoch (3.6-2.6 Ma). The negative magnetization is in the eastern part of the small ridges located to the north of the seamount, therefore the volcanism of these ridges is estimated to be active in Matuyama reverse epoch (2.6-0.8 Ma). In contrast, the western part of the northern ridges is magnetized in positive, and suggested to be constructed in Brunhes normal epoch. The southern part of the seamount flanks, where small volcanic cones are well developed, is magnetized in slightly positive with low magnitude. The remnant magnetization of the seamount flanks may be nearly canceled each other out by the small cone's magnetization. These volcanic cones may have erupted in various ages or in different epoch from the seamount's main body.

Gravity and Magnetic Constraints on the Crustal Structure and Evolution of the Horeki Seamount in the Izu-Bonin Arc