Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Dynamic modeling of the 1992 Landers earthquake
Autore:
Peyrat, S; Olsen, K; Madariaga, R;
Indirizzi:
Ecole Normale Super, Geol Lab, F-75231 Paris 05, France Ecole Normale Super Paris France 05 , Geol Lab, F-75231 Paris 05, France Univ Calif Santa Barbara, Inst Crustal Studies, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara Santa Barbara CA USA 93106 Barbara, CA 93106 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B11, volume: 106, anno: 2001,
pagine: 26467 - 26482
SICI:
0148-0227(20011110)106:B11<26467:DMOT1L>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
1979 IMPERIAL-VALLEY; STRONG-MOTION DATA; SPONTANEOUS RUPTURE; FAULT; SLIP; STRESS; CALIFORNIA; SIMULATION; ENERGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Peyrat, S Ecole Normale Super, Geol Lab, 24 Rue Lhomond, F-75231 Paris 05,France Ecole Normale Super 24 Rue Lhomond Paris France 05 s 05, France
Citazione:
S. Peyrat et al., "Dynamic modeling of the 1992 Landers earthquake", J GEO R-SOL, 106(B11), 2001, pp. 26467-26482

Abstract

We have used observed band-pass filtered accelerograms and a previously determined slip distribution to invert for the dynamic rupture propagation ofthe 1992 Landers earthquake. In our simulations, dynamic rupture grows under the simultaneous control of initial stress and rupture resistance by friction, which we modeled using a simple slip-weakening law. We used a simplified Landers fault model where the fault segments were combined into a single vertical, planar fault. By trial and error we modified an initial stressfield, inferred from the kinematic slip distribution proposed by Wald and Heaton [1994], until dynamic rupture generated a rupture history and final slip distribution that approximately matched those determined by the kinematic inversion. We found that rupture propagation was extremely sensitive tosmall changes in the distribution of prestress and that a delicate balancewith energy release rate controls the average rupture speed. For the inversion we generated synthetic 0.5 Hz ground displacements using an efficient Green's function propagator method (AXITRA). This method enables us to propagate the radiation generated by the dynamic rupture to distances greater than those feasible using the finite difference method. The dynamic model built by trial-and-error inversion provides a very satisfactory fit between synthetics and strong motion data. We validated this model using records from stations used in the slip inversion as well as some which were not included. We also inverted for a complementary model that fits the data just as well but in which the initial stress was perfectly uniform while rupture resistance was heterogeneous. This demonstrates that inversion of ground motion is nonunique.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 06:29:03