Self-induced Deformation on the Fault Plane During an Earthquake Part II: Continuous Tangential Displacements |
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Authors: | A Armigliato S Tinti A Manucci |
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Institution: | Università degli Studi di Bologna, Dip.di Fisica, Settore di Geofisica, Viale Berti Pichat, 8,I-40127 Bologna, Italy., IT
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Abstract: | — This paper regards the on-fault displacement field generated by an earthquake on its own fault plane, with special attention to the tangential displacement vector. It is the continuation and the completion of a previous paper (Armigliato et al., 2003) concerning the analysis of the normal on-fault displacement component. It is here recognised that in addition to the discontinuous shear displacement, which is the main contribution to the seismic dislocation on the fault, there is a tangential displacement contribution that is continuous across the fault. The continuous tangential displacement is exclusively produced by the presence of the free earth's surface. The tangential displacement vector has non-vanishing components in both directions, parallel as well as perpendicular to the imposed uniform shear slip, the first being predominant on the second. We perform a set of computations aimed at evaluating the dependence of the tangential displacement magnitude on the relevant fault parameters for basic cases of rectangular faults embedded in a homogeneous half-space. |
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