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Titolo: Resolution analysis of finite fault source inversion using one and threedimensional Green's functions 1. Strong motions
Autore: Graves, RW; Wald, DJ;
 Indirizzi:
 URS Corp, Pasadena, CA 91101 USA URS Corp Pasadena CA USA 91101URS Corp, Pasadena, CA 91101 USA US Geol Survey, Pasadena, CA 91106 USA US Geol Survey Pasadena CA USA 91106 Geol Survey, Pasadena, CA 91106 USA
 Titolo Testata:
 JOURNAL OF GEOPHYSICAL RESEARCHSOLID EARTH
fascicolo: B5,
volume: 106,
anno: 2001,
pagine: 8745  8766
 SICI:
 01480227(20010510)106:B5<8745:RAOFFS>2.0.ZU;2R
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 STRONGGROUND MOTION; LOSANGELES BASIN; HYOGOKENNANBU; 1994 NORTHRIDGE EARTHQUAKE; LOMAPRIETA EARTHQUAKE; PERIOD STRONG MOTIONS; SANANDREAS FAULT; GREAT 1923 KANTO; 3DIMENSIONAL SIMULATION; RUPTURE HISTORY;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 42
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Graves, RW URS Corp, 566 El Dorado St, Pasadena, CA 91101 USA URS Corp 566El Dorado St Pasadena CA USA 91101 a, CA 91101 USA



 Citazione:
 R.W. Graves e D.J. Wald, "Resolution analysis of finite fault source inversion using one and threedimensional Green's functions 1. Strong motions", J GEO RSOL, 106(B5), 2001, pp. 87458766
Abstract
We develop a methodology to perform finite fault source inversions from strong motion data using Green's functions (GFs) calculated for a threedimensional (3D) velocity structure. The 3D GFs are calculated numerically by inserting body forces at each of the strong motion sites and then recordingthe resulting strains along the target fault surface. Using reciprocity, these GFs can be recombined to represent the ground motion at each site for any (heterogeneous) slip distribution on the fault. The reciprocal formulation significantly reduces the required number of 3D finite difference computations to at most 3N(S), where NS is the number of strong motion sites used in the inversion. Using controlled numerical resolution tests, we have examined the relative importance of accurate GFs for finite fault source inversions which rely on nearsource ground motions. These experiments use both 1D and 3D GFs in inversions for hypothetical rupture models in order (1) to analyze the ability of the 3D methodology to resolve tradeoffs between complex source phenomena and 3D path effects, (2) to address the sensitivity of the inversion results to uncertainties in the 3D velocity structure, and (3) to test the adequacy of the 1D GF method when propagation effects are known to be threedimensional. We find that given "data" from a prescribed 3D Earth structure, the use of wellcalibrated 3D GFs in the inversion provides very good resolution of the assumed slip distribution, thusadequately separating source and 3D propagation effects. In contrast, using a set of inexact 3D GFs or a set of hybrid 1D GFs allows only partial recovery of the slip distribution. These findings suggest that in regions of complex geology the use of wellcalibrated 3D GFs has the potential for increased resolution of the rupture process relative to 1D GFs. However, realizing this full potential requires that the 3D velocity model and associated GFs should be carefully validated against the true 3D Earth structure before performing the inverse problem with actual data.
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Documento generato il 23/10/20 alle ore 13:18:30