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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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Publications

Pollitz, F.F., Bürgmann, R., Stein, R.S., and Sevilgen, V., The Profound Reach of the 11 April 2012 M 8.6 Indian Ocean Earthquake: Short-Term Global Triggering Followed by a Longer-Term Global Shadow, Bull. Seismol. Soc. Am., doi: 10.1785/0120130078 (2014) [Download File]

Pollitz, F.F. and Mooney, W., Seismic structure of the central US crust and upper mantle: Uniqueness of the Reelfoot Rift, Earth Planet. Sci. Lett., (2013) http://dx.doi.org/10.1016/j.epsl.2013.05.042i [Download File]

Hearn, E.H., Pollitz, F.F., Thatcher, W.R., and Onishi, C.T., How do `ghost transients’ from past earthquakes affect GPS slip rate estimates on southern California faults?, Geochem. Geophys. Geosys., DOI: 10.1002/ggge.20080. [Download File]

Pollitz, F.F., Wech, A., Kao, H., and Burgmann, R., Annual modulation of non-volcanic tremor in northern Cascadia, J. Geophys. Res., 118, 2445-2459 (2013). [Download File]

Pollitz, F.F., Rubinstein, J., and Ellsworth, W., Source characterization of near-surface chemical explosions at SAFOD, Bull. Seismol. Soc. Am., 102, 1348-1360 (2012). [Link]

Volkan Sevilgen, Ross S. Stein, and Fred F. Pollitz, Stress imparted by the great 2004 Sumatra earthquake shut down transforms and activated rifts up to 400 km away in the Andaman Sea, Proc Natl Acad Sci USA, doi: 10.1073/pnas.1208799109 [includes animation] [Link]

Pollitz, F.F., Stein, R.S. (USGS), Sevilgen, V., and Bürgmann, R., The 11 April 2012 M=8.6 East Indian Ocean earthquake triggered large aftershocks worldwide, Nature, doi: 10.1038/nature11504 [Download File]

Pollitz, F.F., Burgmann, R., and Thatcher, W., Illumination of rheological mantle heterogeneity by the M7.2 2010 El Mayor-Cucapah earthquake, Geochem. Geophys. Geosys., 13, DOI: 10.1029/2012GC004139 [Download File]

Pollitz, F.F., High-frequency Born synthetic seismograms based on coupled normal modes, Geophys. J. Int., 187, 1420-1442 (2011). [Link]

Pollitz, F.F., Brooks, B., Tong, X., Bevis, M.G., Foster, J.H., Burgmann, R., Smalley, R., Vigny, C., Socquet, A., Ruegg, J.-C., Campos, J., Barrientos, S., Parra, H., Baez Soto, J. C., Cimbaro, S., and Blanco, M., Coseismic slip distribution of the February 27, 2010 Mw 8.8 Maule, Chile earthquake, Geophys. Res. Lett., L09309, doi:10.1029/2011GL047065 (2011). [Download File]

Obrebski, M., Allen, R., Pollitz, F.F., and Hung, S.-H., Lithosphere-asthenosphere interaction beneath the western US from the joint inversion of body-wave travel times and surface-wave phase velocites, Geophys. J. Int., 185, 1003-1021 (2011). [Download File]

Pollitz, F.F., Epistemic uncertainty in California-wide synthetic seismicity simulations, Bull. Seismol. Soc. Am., 101, 2481-2498 (2011). [Download File]

Ryder, I., Burgmann, R., and Pollitz, F.F., Lower crustal relaxation beneath the Tibetan Plateau and Qaidam Basin following the 2001 Kokoxili earthquake, Geophys. J. Int., 187, 613-630 (2011). [Download File]

Pollitz, F.F., Burgmann, R., and Banerjee, P., Geodetic slip model of the 2011 M9.0 Tohoku Earthquake, Geophys. Res. Lett., 38, doi:10.1029/2011GL048632 (2011). [Download File]

Pollitz, F.F., Probabilistic seismic hazard in the San Francisco Bay area based on seismicity simulation, Proceedings of the Third Conference on Earthquake Hazards in the Eastern San Francisco Bay area, California Geological Survey (2010).

Pollitz, F.F., and Thatcher, W. On the resolution of shallow mantle viscosity structure using post-earthquake relaxation data: Application to the 1999 Hector Mine, California, earthquake, J. Geophys. Res., Q06008, doi:10.1029/2010JB007405 (2010). [Download File]

Panet, I., Pollitz, F.F., Mikhailov, V., Diament, M., Banerjee, P., and Grijalva, K., Upper mantle rheology from GRACE and GPS postseismic deformation after the 2004 Sumatra-Andaman earthquake, Geochem. Geophys. Geosyst., Q06008, doi:10.1029/2009GC002905 (2010). [Download File]

Pollitz, F.F., McCrory, P., Wilson, D., Svarc, J., Puskas, C., and Smith, R.B., Viscoelastic-cycle model of interseismic deformation in the northwestern United States, Geophys. J. Int., 181, 665-696 (2010). [Download File]

Pollitz, F.F. and Snoke, J.A., Rayleigh-wave phase-velocity maps and three-dimensional shear-velocity structure of the western US from local non-plane surface-wave tomography, Geophys. J. Int., 180, 1153-1169 (2010). [Download File]

Pollitz, F.F., A viscoelastic earthquake simulator, with application to the San Francisco Bay region, Bull. Seismol. Soc. Am., 99, 1760-1785 (2009). [Download File]

Boyd, O.S., Pollitz, F.F., Zeng, Y., Hardebeck, J.L., Bufe, C.G., and Wesson, R.L., Time-dependent probabilistic hazard maps for Alaska, AGU Monograph on Tectonics of Alaska (2008).

Pollitz, F.F., McCrory, P., Svarc, J., and Murray, J.R., Dislocation models of interseismic deformation in the western United States, J. Geophys. Res., 113, B04413, doi:10.1029/2007JB005174 (2008).

Pollitz, F.F., Banerjee, P., Grijalva, K., Nagarajan, B., and Burgmann, R., Effect of 3D viscoelastic structure on postsiesmic relaxation from the M=9.2 Sumatra earthquake, Geophys. J. Int., 172, 189-204 (2008). [Download File]

Thatcher, W. and Pollitz, F.F., Temporal evolution of continental lithospheric strength in actively deforming regions, GSA Today, 18, 4-11 (2008). [Download File]

Pollitz, F.F. and Schwartz, D., Probabilistic seismic hazard in the San Francisco Bay area based on a simplified viscoelastic-cycle model of fault interactions, J. Geophys. Res., 113, B05409, doi:10.1029/2007JB005227 (2008). [Download File]

Han, S.-C., Sauber, J, Luthcke, S. B., Ji, C., and Pollitz, F. F., Implications of postseismic gravity change following the great 2004 Sumatra-Andaman earthquake from the regional harmonic analysis of GRACE intersatellite tracking data, J. Geophys. Res., 113, No. B11, B11413, doi:10.1029/2008JB005705 (2008). [Download File]

Pollitz, F.F., Finite frequency tomography of crustal structure in the San Francisco Bay region, Geophys. J. Int., 171, 630-656 (2007). [Download File]

Panet, I., Mikhailov, V., Diament, M., de Viron, O., King, G., Pollitz, F., Holschneider, M., and Biancale, R., Co-seismic and post-seismic signatures of tha Sumatra December 2004 and March 2005 earthquakes in GRACE satellite gravity, Geophys. J. Int., doi:10.1111/j.1365-246X.2007.03525.x (2007). [Download File]

Geist, E.L., Titov, V.V., Arcas, D., Pollitz, F.F., and Bilek, S.L., Implications of the December 26, 2004 Sumatra-Andaman earthquake on tsunami forecast and assessment models for great subduction zone earthquakes, Bull. Seismol. Soc. Am., 97, S240-S270 (2007). [Download File]

Banerjee, P., Pollitz, F.F., and Burgmann, R., Coseismic slip distributions of the 26 December 2004 Sumatra-Andaman and 28 March 2005 Nias earthquakes from GPS static offsets, Bull. Seismol. Soc. Am., 97, S86-S102 (2007). [Download File]

Pollitz, F.F., A new class of earthquake observations, Science, 313, 619-620 (2006). [Link]

Pollitz, F.F. and Johnston, M.J.S., Direct test of static-stress versus dynamic-stress triggering of aftershocks, Geophys. Res. Lett., 33, L15318, doi:10.1029/2006GL026764 (2006). [Download File]

Pollitz, F.F., Body-wave traveltime and amplitude shifts from asymptotic travelling-wave coupling, Geophys. J. Int., 167, 705-736 (2006). [Download File]

Pollitz, F.F., Nyst, M., Nishimura, T., and Thatcher, W., Inference of postseismic deformation mechanisms of the 1923 Kanto earthquake, Japan, J. Geophys. Res., 111, B0548, doi:10.1029/2005JB003901 (2006). [Download File]

Pollitz, F.F. and Vergnolle, M., Mechanical deformation model of the western U.S. instantaneous velocity field, Geophys. J. Int., 167, 421-444 (2006). [Download File]

Pollitz, F.F., Banerjee, P., and Burgmann, R., Postseismic relaxation following the great 2004 Sumatra-Andaman earthquake on a compressible self-gravitating Earth, Geophys. J. Int., 167, 397-420 (2006). [Download File]

Pollitz, F.F., Banerjee, P., Burgmann, R., Hashimoto, M., and Choosakul, N., Stress changes along the Sunda trench following the 26 December 2004 Sumatra-Andaman and 28 March 2005 Nias earthquakes, Geophys. Res. Lett., 33, L06309, 10.1029/2005GL02455 (2006). (2006). [Download File]

Nyst, M., Nishimura, T., Hamada, N., Pollitz, F.F., and Thatcher, W., The 1923 Kanto earthquake re-evaluated using a newly augmented geodetic data set, J. Geophys. Res., 111, B11306 (2006). [Download File]

Pollitz, F.F. and Fletcher, J.P., Waveform tomography of crustal structure in the South San Francisco Bay region, J. Geophys. Res., B08308, doi:10.1029/2005JB003509 (2005).

Pollitz, F.F., Nyst, M., Nishimura, T., and Thatcher, W., Coseismic slip distribution of the1923 Kanto earthquake, Japan, J. Geophys. Res., 100, B11408, doi:10.1029/2005JB003638 (2005). [Download File]

Arnadottir, T., Jonsson,S., Pollitz, F.F., Jiang, W., and Feigl, K., Post-seismic deformation following the June 2000 earthquake sequence in the south Iceland seismic zone, J. Geophys. Res., 110, B12308, doi:10.1029/2005JB003701 (2005). [Download File]

Pollitz, F.F., Transient rheology of the upper mantle beneath central Alaska inferred from the crustal velocity field following the 2002 Denali earthquake, J. Geophys. Res., B08407, doi:10.1029/2005JB003672 (2005). [Download File]

Banerjee, P., Pollitz, F.F., and Burgmann, R., Size and duration of the great 2004 Sumatra-Andaman earthquake from far-field static offsets, Science, 308, 1769-1772 (2005). [Download File]

Pollitz, F.F., and Nyst, M.C.J., A physical model for strain accumulation in the San Francisco Bay region, Geophys. J. Int., 160, 302-317 (2005). [Download File]

Pollitz, F.F., Bakun, W., and Nyst, M.C.J., A physical model for strain accumulation in the San Francisco Bay region, II: Stress evolution since 1838, J. Geophys. Res, 109, B11408, doi:10.1029/2004JB003003 (2004). [Download File]

Thomas, C., Livermore, R.A., and Pollitz, F.F., Motion of the Scotia Sea Plates, Geophys. J. Int., 155, 789-804 (2003).

Vergnolle, M., Pollitz, F.F., and Calais, E., Constraints on the viscosity of the continental crust and mantle from GPS measurements and postseismic deformation models in Western Mongolia, J. Geophys. Res., 108, 2502, doi:10.1029/2002JB002374 (2003). [Download File]

Pollitz, F.F., Vergnolle, M., and Calais, E., Fault interaction and stress triggering of 20th century earthquakes in Mongolia, J. Geophys. Res. 108, 2503, doi:10.1029/2002JB002375 (2003). [Download File]

Pollitz, F.F., Transient rheology of the uppermost mantle beneath the Mojave Desert, California, Earth Planet. Sci. Lett., 215, 89-104 (2003). [Download File]

Pollitz, F.F., Postseismic relaxation theory on a laterally heterogeneous viscoelastic model, Geophys. J. Int., 155, 57-78 (2003). [Download File]

Pollitz, F.F., The relationship between the instantaneous velocity field and the rate of moment release in the lithosphere, Geophys. J. Int., 153, 595-608 (2003). [Download File]

Pollitz, F.F., Kellogg, L., and Bürgmann, R., Sinking mafic body in a reactivated lower crust: A mechanism for stress concentration at the New Madrid Seismic Zone, Bull. Seismol. Soc. Am., 91, 1882-1897 (2001). [Download File]

Pollitz, F.F., Peltzer, G., and Bürgmann, R., Mobility of continental mantle: Evidence from postseismic geodetic observations following the 1992 Landers earthquake, J. Geophys. Res., 105, 8035-8054 (2000). [Download File]

Pollitz, F.F., Bürgmann, R., and Segall, P., Joint estimation of afterslip rate and postseismic relaxation following the 1989 Loma Prieta earthquake, J. Geophys. Res., 103, 26975-26992 (1998). [Download File]

Pollitz, F.F., Bürgmann, R., and Romanowicz, B., Viscosity of oceanic asthenosphere inferred from remote triggering of earthquakes, Science, 280, 1245-1249 (1998). [Download File]




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).  Current research focusses on the coseismic and postseismic deformation associated with the M9.0 Tohoku earthquake.

(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 upper 200 km of the western US.  It provides new details about western US seismic structure and reveals the relationships between seismic velocity structure and other geophysical observables (e.g. elastic plate thickness, heat flow, and crustal strain rates).  As the array continues to move eastward, it will illuminate the nature of ancient rifts and collisional structures in the central and eastern US.

 


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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