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 Volume 10 - Issue 1 (2012) |
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Seismotectonic characterization of the Becerreá area (NW Spain)
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C. LÓPEZ-FERNÁNDEZ, J.A. PULGAR, J. DÍAZ, J. GALLART, J.M. GONZÁLEZ-CORTINA, M. RUIZ |
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Abstract |
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The NW sector of the Iberian Peninsula has been classically considered as a seismically stable area, with only
dispersed and low-magnitude activity. Around the village of Becerreá (Lugo) a significant concentration of
earthquakes is observed. Since the beginning of instrumental record in 1979, seven seismic crisis have been
reported in that zone, including 14 events of magnitude >4 and a larger event of magnitude 5.1mbLg (VII EMS) in
1997. Even if this seismicity is to be related to the general compressive regime between Africa and Eurasia, the
seismotectonic characterization of the area is still controversial, as the different hypotheses considered are based
on insufficiently accurate data. New insights to the problem are discussed here, coming from the deployment
of a seismic portable network between 1999 and 2002, which has provided new accurate seismic data. The
corresponding events are distributed around a subvertical axis, reaching a depth of 12km, and epicentres tend to
concentrate beneath the intersection of the main Becerreá fault and secondary, ENE/WSW oriented faults. This
intersection structure is thus interpreted as being responsible for the relatively high level of seismic activity over
the area. |
| Keywords:
Northwest Iberia Becerreá fault. Intraplate earthquakes. Fault interaction. Temporary array. |
| DOI:
10.1344/105.000001750
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Full text (PDF) |
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