Event Location:
MicroSeismic
10777 Westheimer, Suite 110
Houston, TX  77042
*Diagram for 1st floor & room location click here

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Speaker: Jeffrey Shragge, Colorado School of Mines

Detection and location of small (microseismic) earthquakes is critical due to increasing subsurface fluid injection activities. Accurately locating recorded earthquakes is paramount for improving productivity and reducing potential hazards.  A fundamental parameter for either location scenario is the 3D elastic velocity model.   Current 3D seismic velocity building techniques are largely based on larger magnitude earthquakes and rely on high signal-to-noise data.   In this talk I present a new method to jointly invert for the 3D P-wave and S-wave velocity structure using small-magnitude earthquakes (i.e., -1.15 < Mw < 0.24) without requiring a priori knowledge of the microseismic source initiation time or location.  I will present a 3D case study from eastern Ohio using a microseismic data set acquired over the prolific Marcellus Shale unit.  

Speaker Biography: Jeffrey Shragge, Colorado School of Mines
Jeffrey Shragge is an Associate Professor in the Geophysics Department at the Colorado School of Mines (CSM), and a co-Leader of the Center for Wave Phenomena (CWP) research consortium.  He was formerly the Woodside Professor in Computational Geoscience, and an Associate Professor jointly appointed in the School of Earth and Environment and School of Physics at the University of Western Australia.  Jeffrey received a BScH (Physics) from Queen’s University, an MSc (Geophysics) from the University of British Columbia, and a PhD (Geophysics) from the Stanford Exploration Project at Stanford University.  Jeffrey’s research interests include 3D wave propagation, 3D/4D seismic imaging and velocity inversion, near-surface geophysics, and scientific high-performance computing.

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