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Tectonic and seismic implications of an intersegment rupture The damaging May 11th 2011 Mw 5.2 Lorca, Spain, earthquake

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Martínez Díaz, José J. and Bejar Pizarro, Marta and Álvarez Gómez, José Antonio and Mancilla Pérez, Flor de Lis and Stich, Daniel and Herrera García, Gerardo and Morales Soto, José (2012) Tectonic and seismic implications of an intersegment rupture The damaging May 11th 2011 Mw 5.2 Lorca, Spain, earthquake. Tectonophysics, 546-47 . pp. 28-37. ISSN 0040-1951

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Official URL: http://www.journals.elsevier.com/tectonophysics/



Abstract

On May 11th 2011, a Mw 5.2 earthquake stroke the city of Lorca in the SE Spain. This event caused 9 fatalities,
300 injuries and serious damage on the city and the surrounding areas. The Lorca earthquake occurred in the
vicinity of a region bounding two well-known segments of a large active fault, the Alhama de Murcia fault
(AMF). The Lorca earthquake offers a unique opportunity to study how strain is accommodated in an intersegment
region of a large strike slip fault. We map recent tectonic structures in the epicentral region and we
use radar interferometry to analyze the coseismic deformation. Combining these data with seismological observations
of Lorca seismic sequence we first model the source of the earthquake. Then we analyze the influence
of our preferred model in the adjacent segments by Coulomb failure stress modeling. The proposed
earthquake source model suggests that this event ruptured an area of ~4×3 km within the complex structure
that limits the Goñar–Lorca and Lorca–Totana segments of the AMF. The induced static stress change on the
adjacent segments of the fault represents a seismic cycle advance equivalent to 200 to 1000 years of tectonic
loading.


Item Type:Article
Uncontrolled Keywords:Betic Cordillera, INSAR, Coulomb stress transfer, Seismic hazard, Active tectonics, Intersegment zone
Subjects:Sciences > Geology > Geodynamics
ID Code:25871
Deposited On:24 Jun 2014 09:49
Last Modified:29 Apr 2015 08:03

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