  The 11/5/2011 Lorca, Spain earthquake (Mw5.2) and related seismicity produced
extensive damage in the town of Lorca and vicinity. During these earthquakes,
evidence of rotations and permanent deformations in structures were observed.
To analyze these aspects and study the source properties from the near field,
the displacement time histories were obtained including the static component at
Lorca station. Displacement time histories were computed by an appropriate
double time integration procedure of accelerograms. Using these data, the
foreshock and mainshock slip distributions were calculated by means of a
complete waveform kinematic inversion. To study the dynamic deformations, the
3D tensor of displacement gradients at Lorca station was first estimated by a
single station method. Using the finite fault inversion results and by means of
a first order finite difference approach, the dynamic deformations tensor at
surface was calculated at the recording site. In order to estimate the
distribution of the peak dynamic deformations, the calculation was extended to
the close neighboring area of the town. The possible influence of the
near-field deformations on the surface structures was analyzed.

Geophysics