Evidence for High Velocities Around Magma Body M1

XY slice through the Final 3D model at a depth of 2.0 km below the sea floor.
Note that high velocity bodies surround the central low velolocity Magma Body M1.

These record section showing actual seismic data (black wiggles), picks (thin curves) and model predictions (bold pink curves) were chosen for a source/receiver geometery that has rays that rays graze the top of the high velocity bodies that are on the south side of Magma Body M1. Note that the traveltimes predicted from the Draped-1D model (right record section) are systematically late, and have too slow apparent velocities. The high velocity bodies in the Final 3D model (right record section) does a better job at predicting the observed arrival times.