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On the scaling of slip with rupture length for shallow strike-slip earthquakes; quasi-static models and dynamic rupture propagation

Paul Bodin and James N. Brune
On the scaling of slip with rupture length for shallow strike-slip earthquakes; quasi-static models and dynamic rupture propagation
Bulletin of the Seismological Society of America (October 1996) 86 (5): 1292-1299

Abstract

We explore whether observations of average surface rupture properties among strike-slip earthquakes reflect the underlying mechanics. We compare the observed relationship between average slip and rupture length for 27 surface ruptures (18 plate-boundary earthquakes and 9 away from transform plate boundaries) with predictions from two families of uniform-stress-drop models. Purely elastic models with a rupture-limiting locking depth predict a nonlinear relationship while a quasi-dynamic model with no locking depth predicts a linear relationship. We explore whether observations of fault slip at the Earth's surface distinguish which, if either, of these two families of models may be favored. We find that the data provide insufficient constraints to rule out either a linear or a nonlinear relationship. This might arise from uncertainties in the observations or from reasonable (but unrecoverable) variations in locking depths and uniform stress drops among earthquakes. We advance an alternative interpretation that the complexity among the observations is consistent with dynamic rupture models featuring spatially varying stress drops.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 86
Serial Issue: 5
Title: On the scaling of slip with rupture length for shallow strike-slip earthquakes; quasi-static models and dynamic rupture propagation
Affiliation: University of Nevada, Mackay School of Mines, Seismological Laboratory, Reno, NV, United States
Pages: 1292-1299
Published: 199610
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 42
Accession Number: 1997-008903
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199703
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