| Inversion of source mechanism of 1989 Loma Prieta earthquake by three-dimensional FEM Green's function |
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| 作者姓名： | 曾海容 宋惠珍 |
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| 作者单位： | Institute of Geology，China Seismological Bureau，Beijing 100029，China |
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| 摘 要： | IntroductionGrounddisplacementhasacloserelationshipwiththefaultandtheearthquakesourceparameters.IfwecanfindthisrelationshipandinvertthedeformationtOdaterminetheseparameters,wewillbeabletounderstandtheseismicsourceprocessmorecorrectly.Therelationshipisgenerallybasedonfaultmovementmodels.Sofar,therearetwomodels:dislocationandcrack.Dislocationmodelisnamedmovemefltmodelsinceitdoesnottakestness-releaseintoaccount.Basedonthelawofforce-dislocationequivalence,thedisplacementfieldproducedonaninfinite…
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| 关 键 词： | Loma Prieta earthquake ground deformation FEM inversion three-dimension? |
| 收稿时间： | 10 August 1998 |
| 修稿时间： | 22 December 1998 |
Inversion of source mechanism of 1989 Loma Prieta earthquake by three-dimensional FEM Green′s function |
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| HAI-RONG ZENG,HUI-ZHEN SONG.Inversion of source mechanism of 1989 Loma Prieta earthquake by three-dimensional FEM Green's function[J].Acta Seismologica Sinica(English Edition),1999,12(3):249-256. |
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| Authors: | HAI-RONG ZENG HUI-ZHEN SONG |
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| Institution: | Institute of Geology, China Seismological Bureau, Beijing 100029, China |
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| Abstract: | Based on three-dimensional joint finite element, this paper discusses the theory and methodology about inversionof geodetic data. The FEM and inversion formula is given in detail; also a related code is developed. By use of theGreen's function about 3-D FEM, we invert geodetic measurementS of coseismic deformation of the 1989 Ms=7. 1Loma Prieta earthquake to datermine itS source mechanism. The result indicates that the slip on the fault plane isvery heterogeneous. The maximum slip and shear stress are located about 10 kin to northwest of the eathquakesource, the stress drop is about more than 1 MPa. |
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| Keywords: | Loma Prieta earthquake ground deformation FEM inversion three-dimension |
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