Fault branching and rupture directivity
نویسندگان
چکیده
منابع مشابه
Rupture Directivity Characteristics of the 2003 Big Bear Sequence
Abstract We have developed a forward modeling technique to retrieve rupture characteristics of small earthquakes (3 < M < 5), including rupture propagation direction, fault dimension, and rupture speed. The technique is based on an empirical Green’s function (EGF) approach, where we use data from collocated smaller events as Green’s functions to study the bigger events. We tend to choose smalle...
متن کاملApproximation of Rupture Directivity in Regional Phases Using Upgoing and Downgoing Wave Fields
Recent broadband modeling of regional events suggests that vertical directivity is particularly important at high frequency. Conventionally, such directivity is obtained by summing a grid of point sources. This relatively time-consuming procedure can be greatly reduced by introducing directivity time histories appropriate for the various crustal phases in terms of upgoing and downgoing paths th...
متن کاملSlow rupture and weakly pressure-sensitive strength enables compressional branching:
18 The 2012 M8.6 off-Sumatra earthquake, the largest strike-slip and intraplate earthquake recorded 19 to date, followed an exceptionally tortuous rupture path. It featured two episodes of branching 20 into fault segments that were experiencing increased compressive dynamic stresses, hence 21 increased frictional strength. Meng et al. (2012) attributed this unexpected compressional 22 branching...
متن کاملEffects of Fault Dip and Slip Rake Angles on Near-Source Ground Motions: Why Rupture Directivity Was Minimal in the 1999 Chi-Chi, Taiwan, Earthquake
We study how the fault dip and slip rake angles affect near-source ground velocities and displacements as faulting transitions from strike-slip motion on a vertical fault to thrust motion on a shallow-dipping fault. Ground motions are computed for five fault geometries with different combinations of fault dip and rake angles and common values for the fault area and the average slip. The nature ...
متن کاملNormal Fault Rupture Interaction with Strip Foundations
Observations after earthquakes where surface fault ruptures crossed engineering facilities reveal that some structures survived the rupture almost unscathed. In some cases, the rupture path appears to divert, “avoiding” the structure. Such observations point to an interaction between the propagating rupture, the soil, and the foundation. This paper i develops a two-step nonlinear finite-element...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2005
ISSN: 0148-0227
DOI: 10.1029/2004jb003368