Seismic Velocity Structure in the Area of the 2007, Mw 8.0, Pisco-Peru Earthquake: Implications for the Mechanics of Subduction in the Vicinity of the Nazca Ridge

Figure 1

Main tectonic structures of the study area (Ica). The gray zone delimits the coastal mountain range, whereas the light green area delimits the sedimentary area consisting of a longitudinal valley and flatlands. Sloped lines indicate the western mountain range. The fault systems are perpendicular and parallel to the coastlines. The triangles correspond to the seismic stations of our network from December 2007 to May 2008. The dashed white lines indicate the projection of the Nazca Ridge under the study area (South America plates), adapted from [22]. The dashed black lines indicate the rupture area of the 1974 and 1996 earthquakes. Stars correspond to the location of the Pisco earthquake (main event) and the largest aftershock.