Abstract
Abstract The Noto Hanto earthquake in 2007 (M j 6.9) occurred on March 25, 2007 near the west coast of the Noto peninsula, Honshu, Japan. To study the aftershock activity under the sea, we deployed pop-up type ocean bottom seismometers (OBSs) from April 5 to May 8, 2007. We combined data from ten ocean bottom and four onshore seismic stations located around the rupture area of the earthquake and determined the preliminary distribution of the aftershocks. Most of the offshore aftershocks are located in a depth range between 2 and 10 km, and no earthquakes are observed in the lower crust. Hypocenters of deep events occurring at depths greater than 5 km are confined to an area northeastward from the largest aftershock in offshore region. Most of the aftershocks aligned along a high angle and southeast dipping plane, which is consistent with the geometry of the active faults revealed by previous seismic reflection surveys.
Highlights
A large earthquake occurred at a depth of approximately10 km near the west coast of the Noto peninsula, Honshu, Japan, at 09:42 Japan Standard Time (JST, UT+9) on March 25, 2007 with the Japan Meteorological Agency (JMA) magnitude (Mj) of 6.9
We compare our results to those determined by the JMA for examining the differences of foci included in the ocean bottom seismometers (OBSs) network or not
In order to obtain a more precise offshore aftershock distribution, especially regarding with their depths, of the 2007 Noto Hanto earthquake, 12 OBSs were deployed on April
Summary
10 km near the west coast of the Noto peninsula, Honshu, Japan, at 09:42 Japan Standard Time (JST, UT+9) on March 25, 2007 with the Japan Meteorological Agency (JMA) magnitude (Mj) of 6.9. This earthquake, referred to as the 2007 Noto Hanto earthquake, strongly shock some regions of the Ishikawa prefecture, with a maximum seismic intensity of 6 Upper on the JMA scales, one person was killed and more than 350 people were injured as of June 14, 2007 (reported by Fire and Disaster Management Agency, Japan).
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