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Bathymetry Change Investigation of the 2011 Tohoku Earthquake
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 Title & Authors
Bathymetry Change Investigation of the 2011 Tohoku Earthquake
Kim, Kwang Bae; Lee, Chang Kyung;
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 Abstract
Bathymetry change due to the 2011 Tohoku (M9.0) earthquake was investigated through satellite altimetry-derived free-air gravity anomalies (SAFAGA) and shipborne measurements. The earthquake occurred at the plate boundaries near the northeastern coast of Japan, where the oceanic plate subducts beneath the continental plate along deep-sea trench. Data analyzed in this study include SAFAGA from Scripps Institution of Oceanography (SIO), shipborne bathymetry (SB) from the U.S. National Geophysical Data Center (NGDC) and the Japan Agency for Marine-Earth-Science And Technology (JAMSTEC). To estimate the bathymetry change, a reference bathymetry before the earthquake was predicted by gravity-geologic method (GGM) and Smith & Sandwell’s (SAS) method. In comparison with the bathymetry models before the earthquake, GGM bathymetry model generated by a tuning density contrast of 17.04 g/cm3 by downward continuation method was selected because it shows better bathymetry in the short wavelength below about 6 km. From the results, remarkable bathymetry change of about ±50 m was found on the west side of the Japan Trench caused by the earthquake.
 Keywords
Bathymetry Change;2011 Tohoku Earthquake;Satellite Altimetry-derived FAGA;Gravity-Geologic Method (GGM);Japan Trench;
 Language
English
 Cited by
1.
Gravity Variation Estimation of the 2011 Tohoku Earthquake,;;

한국측량학회지, 2015. vol.33. 6, pp.497-506 crossref(new window)
1.
Satellite-derived bathymetry prediction in shallow waters using the Gravity-Geologic Method: A case study in the West Sea of Korea, KSCE Journal of Civil Engineering, 2017, 1976-3808  crossref(new windwow)
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