Seismic crisis occurred in Lorca (Murcia) on 11 th May 2011 originated an important number of accelerograms recorded in the IGN stations. The analysis of uniformly computed parameters has produced interesting results for Earthquake Engineering, in particular those recorded in Lorca. Strong ground motion has been specially observed in the horizontal component perpendicular to the Alhama de Murcia fault, at the origin of the earthquake. Values of PGA= 0,37g and CAV= 0.27g•s seems to be compensated by a short duration of the motion producing a macroseismic Intensity not greater than VII in Lorca. The contribution of near field component of ground motion due to the rupture propagation to and under the Lorca town was shown on acceleration, velocity and displacement time series and also on elastic response spectra.

ResumenSe describe la serie sísmica de Lorca de 2011, presentando sus parámetros de localización y determinando de forma precisa el tensor momento sísmico de los sismos principales. Para toda la secuencia sísmica se analizan sus características mediante el estudio de su distribución temporal y espacial, comparándola con anteriores terremotos. Se resumen los datos macrosísmicos recogidos en la zona así como los valores de la PGA y se realiza una revisión de la sismicidad regional, tanto de los terremotos históricos como de los instrumentales, llegando a modificar algunos de sus parámetros. Palabras clave: Terremoto de Lorca, series sísmicas, intensidad macrosísmica, sismicidad.The 11 May 2011 Lorca earthquake and the seismicity of the region Abstract Lorca 2011 seismic series is described presenting its location parameters and the seismic moment tensor of its main events. We analyse its features by means of the whole seismic sequence temporal and spatial distribution, and we compare it with previous seismic series in the same region. Macroseismic data and PGA values gathered in this area are summarized in this paper. In addition, after a thorough revision of the regional seismicity for both historic and instrumental events, we make some modifications in the seismic catalogue.