El terremoto de Lorca de Mayo de 2011, Mw=5.2Estudio de fuente finita y directividad

  1. J.A. López-Comino 1
  2. F. Mancilla 1
  3. J. Morales 1
  4. D. Stich 1
  1. 1 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2012

Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Issue: 13

Pages: 1714-1717

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

On May 11th 2011, an earthquake (MW=5.2) hit the region of Murcia (Spain), shaking mainly to the town of Lorca and causing extensive personal and material damages. We estimate an oblique reverse faulting mechanism, a shallow hypocenter (4.6 km), at only 5.5 km epicentral distance from the Lorca center. Double difference relocations yield a rupture length of ~ 4 km, suggesting a propagation of the rupture from the northeast to the southwest along the Alhama de Murcia fault. We use the MW 4.6 foreshock and an MW 3.9 aftershock as empirical Greens functions to estimate apparent source time functions, observing a clear directivity effect. We model apparent durations with a unilateral and asymmetric bilateral rupture, in both cases obtaining rupture directivity of ~N215°E, towards Lorca. Therefore, rupture directivity may have contributed to the unfavorable scenario caused by this terrible event.

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