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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Kwang Bae (Kunsan National University) Lee, Chang Kyung (Kunsan National University)
저널정보
한국측량학회 한국측량학회지 한국측량학회지 제33권 제6호
발행연도
2015.12
수록면
497 - 506 (10page)

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초록· 키워드

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Gravity variations due to the 2011 Tohoku (M9.0) earthquake, which occurred at the plate boundaries near the northeastern coast of Japan, were estimated through the GRACE spherical harmonic (Stokes) coefficients derived from the CSR. About -5 μGal gravity variation by the GRACE data was found in the back-arc basin area with respect to a reference gravity model. The mean gravity variations in the back-arc basin area and the Japan Trench area were -4.4 and -3.2 μGal in order. The small negative gravity variations around the Japan Trench area can be interpreted by both crustal dilatation and the seafloor topography change in comparison with the large negative gravity variations in the back-arc basin area by co-seismic crustal dilatation of the landward plate. From the results of the gravity variations, vertical displacements generated from relatively short wavelength caused by the earthquake were estimated by use of multi-beam bathymetric measurements obtained from JAMSTEC. The maximum seafloor topography changes of about ±50 m were found at west side of the Japan Trench axis by the earthquake. The seafloor topography change by the megathrust earthquake can be considered as the results of the landslide of the seafloor throughout the landward side.

목차

Abstract
1. Introduction
2. Gravity Recovery from GRACE
3. GRACE Data Processing for Estimating Gravity Variation
4. Results and Discussions
5. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2016-533-002232316