iPlex Lunch - fall-2012
Triggering Processes of Seismicity Clustering in Southern California
Oct. 10, 2012
noon - 1 p.m.
1707 Geology
Presented By:
- Xiawei Chen - ESS
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Earthquakes strongly cluster in space and time. Different clustering styles represent different triggering processes. For example, aftershock sequences represent stress triggering from mainshocks; while earthquake swarms likely reflect triggering by some underlying physical processes, such as aseismic transients or fluid. Here, we studies isolated earthquake clusters in space and time across southern California. We developed a weighted least-square method to model the spatial migration of seismicity onset, and obtained statistical significance of migration based on a bootstrap resampling method. The results show that the swarm-like clusters mostly show significant migration compared with aftershock-like clusters. The migration parameters are compared with focal mechanism dataset to examine their relationship with tectonic stress orientation. For clusters in geothermal sites, we studied the possibility of triggering from geothermal activities, through comparing seismicity pattern with injection location and time, modeling diffusive migration behavior and examining earthquake stress drop relative to injection data. A strong relationship with injection activities at the Salton Sea geothermal field is suggested.
Seismic Detection of Three-Dimensional Global Mantle Anisotropy
Oct. 17, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Kaiqing Yuan - ESS
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Seminar Description coming soon.
Paleoseimicity of the San Gorgonio Pass Fault Zone
Oct. 24, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Paul McBurnett - ESS
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Seminar Description coming soon.
Tectonic Evolution of the Qilian Shan in Northern Tibet: A Paleozoic Orogen Reactivated
Oct. 31, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Andrew Zuza - ESS
- Robin Reith - ESS
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Seminar Description coming soon.
Anomalously Steep Dips of Earthquakes in the 2011 Tohoku-Oki Source Region
Nov. 7, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Zhongwen Zhan - Caltech
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Seminar Description coming soon.
Crustal Section of a Tilted Arc in the Eastern Transverse Ranges
Nov. 14, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Rita Economos - UCLA
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Seminar Description coming soon.
Updated Results: Earthquake Forecasts with Implementation of Coulomb Stress
Nov. 21, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Anne Strader - ESS
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Seminar Description coming soon.
Slab Gap to Strike Slip in the East Central Mojave
Nov. 28, 2012
noon - 1 p.m.
Geology 1707
Presented By:
- Janet C. Harvey - Caltech
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