The Noto Hanto Earthquake in 2007 : Seismicity and Mechanism(<Special Issue>The Noto Hanto Earthquake in 2007 (Part1))

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  • 平成19年能登半島地震 : 地震活動とメカニズム(<特集>2007年能登半島地震 その1)
  • 平成19年能登半島地震--地震活動とメカニズム
  • ヘイセイ 19ネン ノト ハントウ ジシン ジシン カツドウ ト メカニズム

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Abstract

The Noto Hanto earthquake (M 6.9) on March 25, 2007, is the first M7 class earthquake which struck the Noto Peninsula and strong ground shaking of the intensity of 6+ is the first observed in Ishikawa prefecture. The source depth is 11km and the rupture initiates from the base of the seismogenic zone. The fault plane is dipping to SE with NE-SW strike and the source mechanism is a reverse fault with right lateral slip. The source area spreads over the sea and also the land across the west coast of the Noto Peninsula. In the sea area, some active faults correspond to the fault of the Noto Hanto earthquake while no active fault has found in the land area. The largest aftershocks (M5.3) occur at the NE end and the SW end of the aftershock area. We consider that the aftershock areas including the largest aftershocks are different segments from that of the mainshock based on the spatio-temporal distribution and source mechanisms of the aftershocks.

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