Los Alamos Women in Science
Northern Chapter of the New Mexico Network for Women in Science and Engineering

sponsored by
the   Synergy Center  ,   the   Zocher Corporation
and the Bradbury Science Museum
Talk at 12:00, Thursday, August 18, 2005
Bradbury Science Museum Auditorium
15th and Central, Los Alamos

Peggy Hellweg, University of California, Berkeley
Below Zero: Learning from Small Earthquakes

Mostly we study big earthquakes because they are easy to record. So, we don't know how small earthquakes can get and if the same thing happens in big and small quakes. Fortuitiously, two earthquakes with magnitudes 3.5 and 3.4 occurred almost directly below a Berkeley Seismological Laboratory monitoring borehole in October 2003. More than 4,000 foreshocks and aftershocks to these events were recorded, thanks to their proximity to the borehole instruments; some of these micro-earthquakes had magnitudes as small as -2. This talk will explore what these tiny earthquakes can tell us about how the earth fractures.

Biography -- Dr. Margaret (Peggy) Hellweg received her doctorate from Universitšt Stuttgart in 2000. She is currently lecturing and doing reserach at the University of California, Berkeley, and has an extensive background in both tectonic and volcanic seismological studies, including several years as a staff seismologist at the US Geological Survey.

Members and Nonmembers Welcome!
Open to the Public

LunchTalks webpage: http://nmnwse.org/lawis/lunchtalks