Tomographic inversion of Mt. St. Helens

Main Publication:

Lees, J.M., The magma system of Mount St. Helens: Non-linear high resolution P-wave tomography, J. Volc. Geoth. Res., 53 (1-4), 103-116 1992.

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An earlier, larger scale model (lower resolution) was published in:

Lees, J.M., and R.S. Crosson, Tomographic inversion for three-dimensional velocity structure at Mount St. Helens using earthquake data, J. Geophys. Res., 94 (B5), 5716-5728 1989.

This figure shows a vertical cross section of the inversion results with the line drawn model of Pallister et al.

Below are horizontal cross sections of the velocity model from 0-3.5 km depth.