Axial Volcano P Velocity

by Mike West, Bill Menke and Maya Tolstoy

based on a tomographic inversion with 8000 data; 0.1 damping; 0.50 s cutoff

OBS Stations (circles) & Ship Tracks (lines)

Location of Vertical Slices Through Model

Location of Magma Bodies

Visualizations

• XZ slices on a single page
• XY slices for interfaces 5, 6, 7, and 8 (2.0, 2.4, 3.7, 4.6 km below seafloor
• XZ XZ slices for y= -15, 0 10, 15 and 20 km
• YZ XZ slices for for x= 2 and 8 km
• SW-NE Diagonal HZ slice (-5 -20) to (11 26) km
• SE-NW Diagonal HZ slice (-18 11) to (21 -21)

Other Info

• Depth Statistics of M1 Magma Body
• Evidence for Magma Chambers
• Evidence for High Velocities around Magma Body M1
• Evidence for Deep, Wide Low Velocity Bottom to M1
• Inversion Statistics
• Recond Section Plots (no fits)
• West, M., The deep structure of Axial volcano, Ph.D. Thesis, Columbia University, 2001.
• West et al. Nature article
• Coordinate Tranform Info
• Shot and OBS locations
• Raytrace3D velocity model (inv8000-0.1-0.75/m3)
• Raytrace3D traveltime data (inv8000-0.1-0.75/tt_in.inv)

This research was supported by the Ocean Sciences division of the National Science Foundation.