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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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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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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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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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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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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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Seminar Description coming soon.