Physics – Geophysics
Scientific paper
2012-02-16
Physics
Geophysics
9 pages, 7 figures
Scientific paper
The 11/5/2011 Lorca, Spain earthquake (Mw=5.2) and its foreshock produced extensive damage to buildings and infrastructures within the town of Lorca and vicinity. During these earthquakes, evidence of rotational behaviour and permanent deformations in many structures were observed. The closest accelerometric station that recorded the ground motions was located about 6.0 km from the hypocentral zone. To analyze these aspects and study the source properties from the near-field, I obtained by an appropriate double time-integration procedure of accelerograms, the displacement time histories including the static component. Using these data I calculated the foreshock and the mainshock slip distributions by means of a complete waveform kinematic inversion. To study the dynamic deformations, the 3D tensor of displacement gradients at Lorca station was computed by a single station method. This was done assuming the incidence of body waves at the recording location. Using the finite fault inversion results and a first order finite difference approach, I calculated the 3D tensor of synthetic dynamic deformations at surface in the same site. Synthetic Green's functions were computed using the discrete wave-number method. After comparing the results from both methods, I extended the computation to the close neighboring area of the town, in order to infer the peak dynamic deformations distribution at surface. This was done calculating a surface array of synthetic dynamic strains and rotations in the close area of the recording place. The possible influence of the near-field deformations on the surface structures was finally analyzed.
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