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Titolo:
Resolution analysis of finite fault source inversion using one- and three-dimensional Green's functions 2. Combining seismic and geodetic data
Autore:
Wald, DJ; Graves, RW;
Indirizzi:
US Geol Survey, Pasadena, CA 91106 USA US Geol Survey Pasadena CA USA 91106 Geol Survey, Pasadena, CA 91106 USA URS Corp, Pasadena, CA 91101 USA URS Corp Pasadena CA USA 91101URS Corp, Pasadena, CA 91101 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B5, volume: 106, anno: 2001,
pagine: 8767 - 8788
SICI:
0148-0227(20010510)106:B5<8767:RAOFFS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRONG GROUND MOTION; 1989 LOMA-PRIETA; 1994 NORTHRIDGE; WAVE-FORM; RUPTURE PROCESS; EARTHQUAKE; CALIFORNIA; SLIP; FIELD; JAPAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Wald, DJ US Geol Survey, 525 S Wilson Ave, Pasadena, CA 91106 USA US Geol Survey 525 S Wilson Ave Pasadena CA USA 91106 A 91106 USA
Citazione:
D.J. Wald e R.W. Graves, "Resolution analysis of finite fault source inversion using one- and three-dimensional Green's functions 2. Combining seismic and geodetic data", J GEO R-SOL, 106(B5), 2001, pp. 8767-8788

Abstract

Using numerical tests for a prescribed heterogeneous earthquake slip distribution, we examine the importance of accurate Green's functions (GF) for finite fault source inversions which rely on coseismic GPS displacements andleveling line uplift alone and in combination with near-source strong ground motions. The static displacements, while sensitive to the three-dimensional (3-D) structure, are less so than seismic waveforms and thus are an important contribution, particularly when used in conjunction with waveform inversions. For numerical tests of an earthquake source and data distributionmodeled after the 1994 Northridge earthquake, a joint geodetic and seismicinversion allows for reasonable recovery of the heterogeneous slip distribution on the fault. In contrast, inaccurate 3-D GFs or multiple 1-D GFs allow only partial recovery of the slip distribution given strong motion data alone. Likewise, using just the GPS and leveling line data requires significant smoothing for inversion stability, and hence, only a blurred vision ofthe prescribed slip is recovered. Although the half-space approximation for computing the surface static deformation field is no longer justifiable based on the high level of accuracy for current GPS data acquisition and thecomputed differences between 3-D and half-space surface displacements, a layered 1-D approximation to 3-D Earth structure provides adequate representation of the surface displacement field. However, even with the half-space approximation, geodetic data can provide additional slip resolution in the joint seismic and geodetic inversion provided a priori fault location and geometry are correct. Nevertheless, the sensitivity of the static displacements to the Earth structure begs caution for interpretation of surface displacements, particularly those recorded at monuments located in or near basinenvironments.

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Documento generato il 26/01/20 alle ore 16:05:30