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36 results on '"MANUCCI, ANNA"'

18. TSUNET: a first attempt of tsunami monitoring in Italy

Author

BOSCHI, ENZO, TINTI, STEFANO, ARMIGLIATO, ALBERTO, GALLAZZI, SARA CAROLINA, MANUCCI, ANNA, PAGNONI, GIANLUCA, TONINI, ROBERTO, ZANIBONI, FILIPPO, Graziani L., Maramai A., Boschi E., Tinti S., Armigliato A., Gallazzi S., Graziani L., Manucci A., Maramai A., Pagnoni G., Tonini R., and Zaniboni F.

Published
2006

35. Self-induced Deformation on the Fault Plane During an Earthquake Part I: Continuous Normal Displacements.

Author

Armigliato, Alberto, Tinti, Stefano, and Manucci, Anna

Subjects
EARTHQUAKES, DEFORMATIONS (Mechanics), STRUCTURAL geology, PLATE tectonics, GEOPHYSICS, SEISMOLOGY
Abstract

— The problem of the coseismic deformation induced by an earthquake on its own fault plane is investigated here. The analysis concentrates on the on-fault displacement field accompanying the occurrence of an earthquake in response to a prescribed uniform shear slip and it is carried out on the basis of the classical analytical model by Okada (1992) for a rectangular fault buried in an elastic homogeneous half-space delimited by a planar free surface. The analysis is subdivided into two separate papers: the first dealing with normal and the second with tangential on-fault displacements. In this first paper, concerning the study of the normal displacement component, the contributions of the source and of the correction introduced by the free surface are investigated separately and their dependence on the fault characteristics is thoroughly discussed. Particular attention is also devoted to the effects of the normal displacement on the fault surface geometry. It will be shown that the main effect is that of deforming the fault itself, with deformation consisting chiefly in a rotation of the plane and in a bending of the fault edges. The rotation angle is negligibly small (on the order of 1–10 μrad) for a single earthquake, although repeated seismic events occurring on the same fault might result in rotations of several degrees over geological time scales. [ABSTRACT FROM AUTHOR]

Published
2003
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36. Self-induced Deformation on the Fault Plane During an Earthquake Part II: Continuous Tangential Displacements.

Author

Armigliato, Alberto, Tinti, Stefano, and Manucci, Anna

Subjects
EARTHQUAKES, STRUCTURAL geology, SHEAR (Mechanics), SEISMOLOGY, GEOLOGY, GEOPHYSICS
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 magn itude on the relevant fault parameters for basic cases of rectangular faults embedded in a homogeneous half-space. [ABSTRACT FROM AUTHOR]

Published
2003
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