Attenuation and velocity structure in central Mexico

We construct a 3D P-wave velocity and attenuation model for central Mexico based on seismicity and data recorded from the MASE and VEOX surveys, supplemented by some stations from the National Seismic network in Mexico (SSN). Both local and teleseismic earthquakes are used. The model is constructed in different ways: the individual 2D inversion along two profiles (MASE and VEOX lines), the standard 3D block inversion, and the one with seismicity-constrained structure. The velocity model shows high velocity structures associated with the Cocos slab and lower velocities in wedge. The attenuation model shows concentrated low-Q zones in the wedge and lower crust that are likely due to subduction dehydration processes. The 3D model is the starting point for comparing the structural difference between the flat slab subduction near Mexico City and the normal (30-degree) subduction that occurs 500km to the SE.