Phone: (650) 329-4803
e-mail: vsevilgen@usgs.gov

Mailing address:
345 Middlefield Rd MS 977
Menlo Park, CA-94025

Volkan Sevilgen

My research is based on development of Coulomb Stress Software and Coulomb analyses of recent earthquakes. Coulomb 3 software is designed to investigate Coulomb stress changes on mapped faults and earthquake nodal planes, and is intended both for publication-directed research and for university teaching and instruction.

One can calculate static displacements (on any surface or at GPS stations), strains, and stresses caused by fault slip, magmatic intrusion or dike expansion. Problems such as how an earthquake promotes or inhibits failure on nearby faults, or how fault slip or dike expansion will compress a nearby magma chamber, are germane to Coulomb. Geologic deformation associated with strike-slip faults, normal faults, or fault-bend folds is also a useful application. Calculations are made in an elastic halfspace with uniform isotropic elastic properties following Okada [1992].

My recent Coulomb analyses:
Coulomb Stress Analysis for 29 July 2008 Mw= 5.4 Chino Hills, California Earthquake, 8/5/08
[Printable article (PDF) (1.6 Mb)]

I also design and maintain our USGS Research Group, Coulomb Software, Team Tokyo and Global Earthquake Model (GEM) web sites. These websites are designed to serve both the public and the scientific community. They include technical and non-technical summaries of our research, our published reports, press articles about our work, and materials for students and teachers at high schools and universities.