Physics
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3903301l&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 3, CiteID L03301
Physics
1
Seismology: Body Waves, Seismology: Earthquake Source Observations (1240), Tectonophysics: Dynamics And Mechanics Of Faulting (8004)
Scientific paper
On May 11th 2011, a rather small earthquake caused nine fatalities in the city of Lorca, SE-Spain. We analyze seismograms from a dense network to characterize the source of this earthquake. We estimate an oblique reverse faulting mechanism, moment magnitude of 5.2 and a shallow hypocenter (4.6 km), at only 5.5 km epicentral distance from the city center. Double difference relocations yield a ∼5 km long, NE-SW trending distribution of aftershocks SW of the mainshock, suggesting a SW propagating rupture 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 ∼N220°E, towards Lorca. In addition to the near epicenter and shallow depth, directivity may have contributed to the significant impact.
López-Comino José-Ángel
Mancilla Flor de Lis
Morales Jose
Stich Daniel
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