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iPlex Lunch - spring-2014

Crustal deformation study in Japan using SAR//Lessons of the 2011 Tohoku-Oki Earthquake

April 2, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Takeshi Sagiya - Nagoya university
  • Manabu Hashimoto - Kyoto University
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Imprints of geological inheritance on coseismic rupture: An example from the 2008 Mw7.9 Wenchuan ear

April 9, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Jing Liu - Caltech
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Lithospheric shear velocity and discontinuity architecture of Hudson Bay

April 14, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Rob Porrit - USC
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Understanding irregular signals in noise cross correlation function: Case studies in China"

April 23, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Weitao Wang - Geophysics China Earthquake Administration
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Applications of nuclear resonant scattering to further our understanding of Earth’s interior

May 14, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Dongzhou Zhang - Caltech
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The elastic and the thermodynamic properties of minerals under extreme P-T conditions are of general importance to the geodynamic modeling and the interpretation of seismic-wave observations. An accurate laboratory determination of these properties will provide constraints to determine the composition and temperature of Earth’s interior. In this talk, I will focus on the application of nuclear resonant scattering, an advanced synchrotron based spectroscopic technique, to further our understanding of candidate materials in Earth’s interior (e.g., Sturhahn & Jackson 2007; Gao et al. 2009). Nuclear resonant scattering is capable of detecting subtle changes in the mineral’s hyperfine parameters, and can therefore be sensitive to the transitions occurring in minerals under pressure (e.g., enstatite, Zhang et al. 2011). From nuclear resonant inelastic scattering of synchrotron radiation, it is possible to extract the elastic properties of minerals. I will present such results on enstatite, which we have compared with seismic observations to understand large lateral variations in shear wave velocities in the upper mantle (e.g., Zhang et al. 2013). Recently, nuclear resonant scattering has been shown to be a powerful probe in determining the solid-liquid boundary of materials (Jackson et al. 2013). By combining nuclear resonant scattering with the laser heated diamond anvil cell and a novel fast temperature readout spectrometer, we are determining the melting temperatures of an iron-nickel alloy at high pressures, an essential parameter in constraining the internal thermal structure of the Earth.

Long and thin: the role of seismogenic width on rupture and fault zone growth". Please Let me know i

May 21, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Jean-Paul Ampuero - Caltech
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Surface wave, shear wave and higher mode anisotropy under Mexico

May 27, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Igor Stubailo - UCLA
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A Universal Very Low Friction Mechanism for Earthquake Sliding on Mature Faults

June 4, 2014
noon - 1 p.m.
Geology 1707

Presented By:

  • Harry Green - UC Riverside
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