2007年能登半島地震に伴う地殻変動と能登半島の海成段丘

概要

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The 2007 Noto Hanto earthquake produced a coastal uplift in the epicentral area, where several coastal terraces are widely distributed. To reveal the long-term activity of the source fault, we compared the altitude distribution of the former shorelines on coastal terraces and Holocene emerged shoreline with coseismic uplifts associated with the Noto Hanto earthquake. The 1m-digital elevation model obtained by airborne LiDAR was used for identifying of the former shore-lines and evaluating the altitude of coastal terraces. The altitude pattern of the former shorelines on the middle coastal terrace, which corresponds to sea level of 120ka (MIS5e), is concordant with the crustal deformation associated with the 2007 Noto Hanto earthquake. Under the assumption that the coastal uplift represents the cumulative crustal deformation produced by similar earthquake events to the 2007 one, the average recurrence interval of earthquake events is estimated to be 1500 years.
東京大学の論文
2008-03-26