2003 Fiscal Year Final Research Report Summary
Crustal deformations caused by seismic and volcanic sources in a spherical earth
| Project/Area Number |
13640420
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WENKE Sun The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (10323651)
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| Co-Investigator(Kenkyū-buntansha) |
FURUTA Masato The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助手 (60313045)
OKUBO Shuhei The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (30152078)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Dislocation / Spherical earth / Seismic fault / Volcano / Crustal deformation / Displacement / Gravity / Geoid |
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| Research Abstract |
Mainly theoretical research was performed : 1.The effects of the Earth's curvature and radial heterogeneity in dislocation studies were studied, though comparing the coseismic deformations caused by dislocations in half space and homogeneous spherical earth models, a homogeneous sphere and a layer spherical model. It was learnt that both the effects are large. 2.To overcome the disadvantages of the current dislocation theories, a new theory for calculating asymptotic deformations excited by a point dislocation in a spherical symmetric earth model was presented. This theory is given by a closed form of mathematical expressions, so that it is mathematically simple and can be applied easily. Moreover, since the asymptotic theory includes sphericity and vertical structure effects, it is physically more reasonable than the flat-earth theory. 3.The crustal deformation caused by the 2000 Miyakejima volcanic and seismic activities was studied. 4.The co-seismic deformation in spectrum was also considered, so that the ability of satellite gravity missions to detect co-seismic geoid and gravity changes were observed and determined. 6.The expressions of co-seismic strains were derived. The results were presented in different national/international conferences, and published in 8 papers.
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[Publications] Okubo, S., W.Sun, T.Yoshino, T.Kondo, J.Amagai, H.Kiuchi, Y.Koyama, R.Ichikawa, M.Sekido: "Far-Field Deformation due to Volcanic Activity and Earthquake Swarm, Vistas for Geodesy in the New Millennium"International Association of Geodesy Symposi(Adam, J. and K.P.Schwarz (Eds.)). Volume 125. 518-522 (2002)
Description
「研究成果報告書概要(欧文)」より
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