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| Titel |
Iberia-Maghreb regional moment tensor solutions for 2005-2008 |
| VerfasserIn |
D. Stich, J. Morales |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026065
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| Zusammenfassung |
| We show moment tensor solutions for earthquakes in the Iberia-Maghreb region from May
2005 to November 2008, with moment magnitudes ranging from 3.3 to 6.0. Inversion is based
upon intermediate-period waveforms recorded at regional seismic broadband stations.
Following the recent densification of permanent broadband networks and important temporal
deployments including TopoIberia, at present a total of ~150 stations are recording in Spain,
Portugal and Morocco. This unprecedented station density allows for addressing additional
small events from available short-distance recordings and helps constraining source
orientation more tightly in general. The solutions for 2005-2008 are an important upgrade of
the Iberia-Maghreb moment tensor inventory, enhancing the image of seismotectonics at the
compressive N-Algerian margin, in the left-lateral trans Alboran shear zone and at the
transpressive SW-Iberian margin, as well as providing valuable samples of seismic
deformation for the Moroccan interior, the western Betics and the Iberian foreland.
Faulting in Morocco resembles the Alboran situation, suggesting the continuity
of the trans Alboran shear faulting regime. New solutions for the western Betics
and the foreland show strike-slip and reverse faulting style, contrasting with the
dominance of normal faulting in the adjacent areas towards east and north, but the strain
orientations appear highly heterogeneous and may be influenced by local conditions. |
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