Abstract
Abstract The 2007 Noto Hanto earthquake (M w 6.6) is the first major earthquake in inland Japan since the launch of the Japanese ALOS satellite. Interferometric synthetic aperture radar successfully mapped the coseismic displacements from both ascending and descending orbits in and around the earthquake epicentral region. The line-of-sight displacements toward the satellite from the ascending and descending orbits amount to about 50 and 20 cm, respectively. The interferograms as well as the GPS data of the GEONET network are inverted in order to determine the slip distribution on the source fault. The dip and strike angles of the preferred model are 48° and N51°E, respectively, and its fault slip area reaches the seafloor. The dip angle is not well constrained in our tested range between 40° and 60°. The dominant slip area is located just above the hypocenter, at depths between 4 and 10 km. Many aftershocks seem to have occurred on and around the area of dominant slip.
Highlights
A Mw 6.6 (Mj 6.9) earthquake occurred on 25 March2007 approximately 10 km beneath the western coast of the Noto Peninsula (Fig. 1)
This study proposes a fault model of the earthquake by inverting the interferometric SAR (InSAR) data and the GEONET GPS data
The interferograms are highly coherent and clearly show up to about 50 and 20 cm of ground displacements in the line-of-sight directions corresponding to the ascending and descending orbits, respectively
Summary
2007 approximately 10 km beneath the western coast of the Noto Peninsula (Fig. 1). This earthquake shook the city of Wajima and surrounding areas, resulting in one death and more than 300 wounded. Based on the residual (Fig. 4(b)), we take the upper limit of the fault patches to be 0 km as our preferred value With this geometry, the slip area is permitted to reach the ground. Large residuals are observed close to and north of the fault top margin (Fig. 5(b)) and in a broader area above the entire fault (Fig. 5(b, d)) The former is a direct consequence of an unrealistic slip on the uppermost patches beneath this area that results from the lack of data points in the corresponding area (see Fig. 3) and from the assumption of the smoothness in the slip distribution. The shallower slip area lies beneath the sea and has a limited resolution; how-
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