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| | Abstract | | Subsurface structures around the Osore-zan volcano, Northernmost Honshu Island, Japan have been studied by analyzing the existing gravity data over a 100 km x 100 km square area. Based on the Fourier spectral analysis techniques, the Bouguer anomaly distribution is separated into 4 gravity components, that is, trend, long wavelength, short wavelength, and noise ones. These results of filtered gravity components are critically evaluated with other geological evidences. Particularly, each of the long and short wavelength components corresponds mainly to the horst-graben structure of granitic bedrocks and the undulation of the shallower accretion bedrocks, respectively. These facts demonstrate the usefulness of the filtering techniques adopted here. |
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