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bio image of Volkan  Sevilgen

Volkan Sevilgen


Contact Info

Short Biography


I am a US citizen and work as a USGS contractor. My research is based on earthquake stress interactions. I investigate whether earthquakes are triggered by static stresses or dynamic stresses.  Shinji Toda, Ross Stein and Jian Lin, and I  built a static stress modeling Coulomb Stress Software and performed many Coulomb analyses immediate after moderate to large 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. I also developed a dynamic stress modeling tool based on synthetic seismograms and use it in Sevilgen et al., PNAS, 2012. 

Volkan's LinkedIn

7 April 2011 NPR interview on Tohoku Earthquake

I  designed and maintain our USGS Research Group, Coulomb Software, Team Tokyo and the first version of the 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. 

Volkan's YouTube Channel

Coulomb Training Video (Total 6 Hours)  Part 1, Part 2, Part 3, Part 4 

Quake Towers Compare reinfored and non-reinforced buildings against earthquakes 







Pollitz, F.F., R.S. Stein, V. Sevilgen, R. Bürgmann, 2012, The 11 April 2012 M=8.6 East Indian Ocean earthquake triggered large aftershocks worldwide, Nature, doi: 10.1038/nature11504 (with press release and animation). [Link]

Sevilgen, V., R.S. Stein, and F.F. Pollitz, 2012, Stress imparted by the great 2004 Sumatra earthquake shut down transforms and activated rifts up to 400 km away in the Andaman Sea, Proc Natl Acad Sci USA, doi: 10.1073/pnas.1208799109 [includes animation] [Link]

Lin, J, R.S. Stein, V. Sevilgen, and S. Toda,

USGS–WHOI–DPRI Coulomb Stress-Transfer Model for the January 12, 2010, MW=7.0 Haiti Earthquake, U.S. Geol. Surv. Open-File Rep. 2010-1019, 8 pp., 2010.
[Online Article]
V. Sevilgen, R.S. Stein,
Search for response of seismicity to static and dynamic stresses imparted by the 1999 M=7.4 Izmit and M=7.1 Duzce, Turkey, earthquakes: Seismicity rate rapidly decayed at Izmit but remains high at Duzce; remote dynamic effects not detected, Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract S51C-1450, 2009
Sevilgen, V.
Coulomb Stress Analysis of the 21 February 2008 Mw= 6.0 Wells, Nevada, Earthquake, Nevada Seismological Laboratory, 2008 Wells Earthquake Special Volume, 2008
[Printable article (0.6 Mb)]
Sevilgen, V.
Coulomb Stress Analysis of the 21 February 2008 Mw= 6.0 Wells, Nevada, Earthquake, Eos Trans. AGU, 89(52), Fall Meet. Suppl., Abstract S51B-1746, 2008
[Printable poster (9.2 Mb)]
Hauksson, E., Felzer, K., Given, D., Giveon, M., Hough, S., Hutton, K., Kanamori, H., Sevilgen, V., Wei, S., and Yong, A.
Preliminary report on the 29 July 2008 Mw5.4 Chino Hills, Eastern Los Angeles basin, California, earthquake sequence, 79, 6, 10.1785/gssrl.79.6.855, SRL, 2008
[Printable article (3.3 Mb)]
Toda, S., Stein, R.S., Lin, J., and Sevilgen, V.
Coulomb 3.1 User's Guide, 2008
[Coulomb Website]
V. Sevilgen
Coulomb Stress Analysis for 29 July 2008 Mw= 5.4 Chino Hills, California Earthquake, 8/5/08
[Printable article (1.6 Mb)]
V. Sevilgen
Coulomb Stress Analysis for 21 February 2008 Mw= 6.0 Wells, Nevada Earthquake, 4/17/08
[Printable article (1.6 Mb)]
V. Sevilgen
Coulomb Stress Analysis for Mw= 5.4 Alum Rock Earthquake, 11/20/07
[Online Seminar Video (Volkan Sevilgen's part starts at 54 min.)]
Carton, H., S. C. Singh, A. Hirn, S. Bazin, B. de Voogd, A. Vigner, A. Ricolleau, S. Cetin, N. Oçakoglu, F. Karakoç, and V. Sevilgen
Seismic imaging of the three-dimensional architecture of the Çinarcik Basin along the North Anatolian Fault, J. Geophys. Res., 112, B06101, doi:10.1029/2006JB004548
21 June 2007
[Printable article (3 Mb)]
Toda, S., Stein, R.S., Lin, J., and Sevilgen, V.
Coulomb Teaching, Apr 29-30, Aug 9, Sep 9, Dec 8 and 15, 2007
Coulomb Class Video Dec 8, 2007 (4 parts 5 hours 37 min total)
[Coulomb Class Video Part 1]
[Coulomb Class Video Part 2]
[Coulomb Class Video Part 3]
[Coulomb Class Video Part 4]
Toda, S., Lin, J., Sevilgen, V. and Stein, R.S.
Coulomb 3.0, an Interactive Tool for Studying Earthquake Interactions,poster, Statistical Seismology: Physical and Stochastic Modelling of Earthquake Occurrence and Forecasting, “Ettore Majorana" Foundation and Centre for Scientific Culture, 2007
Toda, S., Lin, J., Sevilgen, V. and Stein, R.S.
Coulomb 3.0, an interactive tool for studying earthquake interactions,conference talk at, 2007 annual meeting of Seismological Society of America, Kona, Hawaii, USA, April 2007.
V. Sevilgen, H. Eyidogan,
Calculation of the Earthquake Intensity via the Internet, poster, 17th International Geophysical Congress & Exibition by CGET, 2006.
[Printable poster (1.8 Mb)]
V. Sevilgen,
Calculation Earthquake Intensity Distribution via the Internet, MSc. Thesis, Istanbul Technical University, Dept. of Geophysical Engineering, 2006.
[Project website]
V. Sevilgen,
A New Aproach to Determine Earthquake Intensity Distribution, BSc. Thesis, Istanbul Technical University, Dept. of Geophysical Engineering, 2003.
S. Singh, A. Hirn, S. Basin, B. Voogd, A. Vigner, A. Ricolleau, S. Cetin, N. Ocakoglu, F. Karakoy and V. Sevilgen
Seismarmara Draft Cruise Report Leg 2, prepared by S. Singh, 2001.


My Science Topics

Science Topic
Natural Hazardsearthquake probabilities
Natural Hazardsearthquakes
Geologic Processesfaulting
Geologic Processesplate tectonics
Geologic Processesrock deformation

My USGS Science Strategy Areas

A National Hazard, Risk, and Resilience Assessment Program

Earthquake stress interactions

Image of Current Focus for Earthquake stress interactions
My research focuses upon how earthquakes interact through the transfer of stress. Examples of such interaction include the progression of mainshocks along a fault, aftershocks, seismic quiesence, and earthquake clustering. My collaborators and I are interested in how one earthquake can promote subsequent shocks at some sites and inhibit them in others.

Coulomb stress transfer for recent events

11 March 2011 M=9.0 Off-Tohoku stress transfer


Contact Information

Volkan Sevilgen
345 Middlefield Road
Menlo Park, CA 94025-3561
650-329-5163 - Fax
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