著者

本多 亮 笠原 稔 茂木 透

出版者

北海道大学大学院理学研究院自然史科学部門(地球物理学)

雑誌

北海道大学地球物理学研究報告 (ISSN:04393503)

巻号頁・発行日

vol.72, pp.203-218, 2009-03-15

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Although there are a plenty amount of gravity data over the northern part of Hokkaido (Dohoku region), most of them are not published yet. We have been performing gravity measurement in this region since 2007. Additionally, new data is added by new measurement during 2008. These new data clearly demonstrate the improvement of the gravity anomaly distribution over the Japan-sea side area of Dohoku region. Recurrent thrust type faultings which are dominant in this region generate positive Bouguer gravity anomalies over the hanging wall side, and horizontal gravity gradients above fault lines. Bouguer gravity anomaly map clearly indicates that the lineament of large horizontal gravity gradient coincides with the Horonobe fault. This may indicate the cumulative faulting on the same place.