Near-real-time Seismic Moment-tensor Determination in Spain

European continuous active tectonic strain–stress map

“…This method assumes two important restrictions: 1) The main axes of brittle deformation (strain) and the principal stresses are parallel, and 2) One of the strain-stress axes is vertical. Even Table 1 k′ parameter (e y / e z ) and normalized k′ values for the different strain regimes and number of focal mechanism used in this work (Dziewonski and Woodhouse, 1983), Italian INGV (Pondrelli et al, , 2004, the ETH-Zürich (Braunmiller et al, 2002), moment tensor project at IAG-Granada (Stich et al, 2003) and IGN-Madrid (Rueda and Mezcua, 2005). The final database contains 1608 earthquakes with Mw values between 2.6 and 7.5. though these conditions may seem very restrictive, the experience verified on this kind of analysis points to on the contrary.…”

“…Therefore, earthquake focal mechanisms are valuable and widely-used stress indicators. With the densification of the seismic broadband networks in recent years, regional moment tensor inversion has become an important source of homogeneous wide-scale stress indicators (Pondrelli et al, , 2004Braunmiller et al, 2002;Stich et al, 2003;Rueda and Mezcua, 2005). These national and European moment tensor networks invert three-component time domain displacement seismograms, including P-, S-and surface waves, for the mechanical force system associated with earthquake slip, thereby combining a far more complete evaluation of the recorded wavefield with a more general parameterization of the seismic source.…”

“…The Ibero-Maghrebian moment tensor project at IAG-Granada (Stich et al, 2003) inverts earthquakes larger than 3.5 from a dense station network and provides the currently largest moment tensor inventory for the region. Finally, in 2003, IGN-Madrid started operating fully automated near-real time inversion, based on the 3 closest regional recordings for earthquakes larger than magnitude 3.3 (Rueda and Mezcua, 2005).…”

The morpho-tectonic setting of the Southeast margin of Iberia and the adjacent oceanic Algero-Balearic Basin

“…Eleven focal mechanisms, calculated from Moment Tensor Solution -MTS- (Dziewonski et al, 1982;Stich et al, 2006;Rueda and Mezcua, 2005), have been analyzed in order to constraint the kinematics and dynamics of the area, and to correlate with active faults (Table III and (Fig. 17).…”

Spectral analysis of the gravity and elevation along the western Africa–Eurasia plate tectonic limit: Continental versus oceanic lithospheric folding signals

“…The used data sources are earthquake focal mechanisms calculated from the centroid moment tensor inversion (Dziewonski et al, 1982) from different catalogues: CMT catalogue (Dziewonski and Woodhouse, 1983), the Italian INGV (Pondrelli et al, , 2004, the ETH-Zürich (Braunmiller et al, 2002), the Ibero-Maghrebian moment tensor project at IAG-Granada (Stich et al, 2003), and finally the IGN-Madrid catalogue (Rueda and Mezcua, 2005).…”