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Fred Pollitz

Supervisory Research Geophysicist

Contact Info


Short Biography

Fred Pollitz is a research geophysicist with the U.S. Geological Survey.  He received his Ph.D in Geophysics (long-period seismology) from Princeton University in 1989, advised by Tony Dahlen.  As a postdoctoral researcher he switched focus to crustal deformation studies, motivated initially through collaboration with Dr. Selwyn Sacks at the Carnegie Institution of Washington.  With the USGS since 2000, he has continued to work on problems related to crustal deformation and long-period seismology.



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Current Projects

(1) Rationalizing postseismic crustal deformation. This research makes use of GPS, InSAR, and/or GRACE gravity observations made after many land-based events (M7.3 1992 Landers, M7.1 1999 Hector Mine) and oceanic interplate events (M9.2 2004 Sumatra, M8.8 2010 Chile, M9.0 2011 Tohoku).  

(2) Regional surface wave tomography.  Using broadband recordings of seismic surface waves from USArray, this work constrains the 3D shear wave velocity structure in the crust and shallow mantle of the continental US. 

(3) Interpreting shear-wave energy generated by near-surface explosions.  With forward modeling of the seismic wavefields recorded in SAFOD downhole arrays, collaborative research with Justin Rubinstein and Bill Ellsworth investigates how S wave energy is produced by explosive sources at offsets ranging from 10s of meters to several km.

 


Software

VISCO1D-v3 is a program package to calculate quasi-static deformation on a layered spherical Earth from a specified input source (fault plane parameters) at specified points on the surface or at depth.  It uses a spherical harmonic expansion of the global deformation field and evaluates a sum of viscoelastic normal modes in a semi-analytic computation.  It is available at http://earthquake.usgs.gov/research/software/


Contact Information

Fred Pollitz
345 Middlefield Road
Menlo Park, CA 94025-3561
fpollitz@usgs.gov
650-329-4821
650-329-5143 - Fax
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