Serving professionals in engineering, environmental, and groundwater geology
since 1957

***Tuesday, June 12, 2012***
Download June Newsletter

Topic: "The Goldilocks Seismicity of Southern California"

Speaker: Dr. Egill Hauksson
Senior Research Associate in Geophysics at the California Institute of Technology

Location: Stevens Steak House
5332 Stevens Place, City of Commerce
Southwest Corner of I-5 & Atlantic Boulevard

Date/Time: Tuesday, June 12, 2012

We analyze the waveform relocated (1981 to 2011) catalog of more than 500,000 earthquakes recorded in southern California, and assign a heat flow value and a GPS-measured shear strain rate to each epicenter. We synthesize this new data set to show that the “goldilocks seismicity” occurs preferentially in crust that is neither too cold nor too hot, as it accommodates plate-boundary loading at shear strain rates that are also neither too slow nor too fast. We have also measured the distance between each of the 500,000 hypocenters and the closest principal slip surface of a late Quaternary fault (PSZ) as mapped in the SCEC Community Fault Model (CFM). This new parameters allows us to investigate how different properties of the seismicity change with distance from the nearest PSZ.
Speaker Biography:
Dr. Egill Hauksson is Senior Research Associate in Geophysics at the California Institute of Technology, Pasadena, CA since 1992 and Senior Research Fellow from 1989 to 1992. He was Research Associate (1983-1985) and Research Professor of Geological Sciences (1985-1989), Univ. of Southern Calif. (USC), Center for Earth Sciences and Dept. of Geol. Sciences. He received his Ph. D. (1981) in Geophysics from Columbia University in New York.

He is a member of the California Integrated Seismic network (CISN) Steering Committee and chairs the CISN Program Management Group (2001 – Present). He was member of the Steering Committee (1991-1996) and serves on the Planning Committee (2007-Present) for the Southern California Earthquake Center (SCEC). He is a member of the IRIS/USArray Working Group (2006-present). He was associate editor for the Journal of Geophysical Research (1996-1998) and guest editor for the Bulletin of Seismological Society of America, in 2002. He is editor for Geophysical Journal International (2012 to Present). He is a member of the American Geophysical Union, Seismological Society of America, and American Association for the Advancement of Science. He has authored and co-authored more than 100 scientific manuscripts published in peer reviewed scientific journals, and more than 250 papers presented at scientific meetings.

His research interests are seismology with emphasis on mitigating earthquake hazards, determining earth structure, and understanding the physics of earthquakes; development of instrumentation and software for real-time earthquake monitoring, early warning, waveform analysis, and hazards mitigation.