• Home
• About
• ScrippsNews
• Magazine
• Research
• Students
• Ships
• Support Scripps
• Jobs at Scripps
• SIO Only

SHEARER, PETER

Professor of Geophysics

Degrees:

• B.S., Yale University, Connecticut
• Ph.D., UCSD, Scripps Institution Oceanography

Research Interests:

• Structure of Earth's mantle and core
• Earthquake properties
• Seismicity of southern California
• Seismic processing methods

Courses Recently Taught:

• SIO 1: The Planets
• SIO 227A: Introduction to Seismology
• SIO 233: Intro to Computing at SIO
• SIO1: The Planets
• SIO227A: Introduction to Seismology
• SIO227C: Advanced Seismology II
• SIO233: Intro to Computing at SIO
• SIO239: Special Topics in Geophysics

Honors and Awards:

• Elected National Academy of Sciences, 2009
• AGU Gutenberg Lecture, 2005
• AGU Excellence in Refereeing, 2003
• SIO Outstanding Graduate Teaching Award, 2003
• Fellow, American Geophysical Union, 1999

Mentoring:

• Oki, Satoko (Post Doc; 2007-2008)
• Rychert, Catherine (Post Doc; 2007-2009)
• Cochran, Elizabeth (Post Doc; 2005-2006)
• Lawrence, Jesse (Post Doc; 2004-2007)
• Allman, Bettina (Graduate; 2003-2008)
• Ishii, Miaki (Post Doc; 2003-2005)
• Walker, Kris (Post Doc; 2003-2008)
• Wein, Agatha (Masters; 2003-2004)
• Lin, Guoqing (Graduate; 2002-2007)
• Bulow, Renee (Graduate; 2001-2007)
• Hardebeck, Jeanne (Post Doc; 2000-2003)
• Hutko, Alexander (Masters; 2000-2002)
• Warren, Linda (Graduate; 1997-2003)
• Astiz, Luciana (Post Doc; 1994-1999)
• Flanagan, Megan (Post Doc; 1994-1998)
• Richards-Dinger, Keith (Graduate; 1993-2000)
• Kendall, Michael (Post Doc; 1992-1993)
• Aster, Richard (Post Doc; 1991-1991)
• Earle, Paul (Graduate; 1991-1997)
• Bhattacharyya, Joydeep (Graduate; 1989-1996)
• Aster, Richard (Graduate; 1987-1991)

2010. Lin, G., C. H. Thurber, H. Zhang, E. Hauksson, P. M. Shearer, F. Waldhauser, T. M. Brocher and J. Hardebeck, A California statewide three-dimensional seismic velocity model from both absolute and differential times, Bull. Seismol. Soc. Am., 100, 225-240, doi: 10.1785/0120090028.

2010. Rychert, C. A. and P. M. Shearer, Resolving crustal thickness using SS waveform stacks, Geophys. J. Int., 180, 1128–1137, doi:10.1111/j.1365-246X.2009.04497.x.

2010. Rychert, C. A., P. M. Shearer and K. M. Fischer, Scattered wave imaging of the lithosphere-asthenosphere boundary, Lithos, 120, 173–185, doi: 1016/j.lithos.2009.12.006.

2010, Shearer, P. and R. Bürgmann, Lessons learned from the 2004 Sumatra-Andaman megathrust rupture, Annu. Rev. Earth Planet. Sci., 38, 103–131, doi: 10.1146/annurev-earth-040809-152537.

2010. Castro, R., P. M. Shearer, L. Astiz, M. Suter, C. Jacques-Ayala and F. Vernon, The long-lasting aftershock series of the 3 May 1887 MW 7.5 Sonora earthquake in the Mexican Basin and Range Province, Bull. Seismol. Soc. Am., 100, 1153–1164, doi: 10.1785/0120090180.

2010. Buehler, J. S., and P. M. Shearer, Pn tomography of the western United States using USArray, J. Geophys. Res., 115, doi: 10.1029/2009JB006874.

2009. Allmann, B. B., and P. M. Shearer, Global variations of stress drop for moderate to large earthquakes, J. Geophys. Res., 114, doi: 10.1029/2009JB005821.

2009. Shearer, P. M., and G. Lin, Evidence for Mogi doughnut behavior in seismicity preceding small earthquakes in southern California, J. Geophys. Res., 114, doi: 10.1029/2009JB005982.

2009. Walker, K. T., and P. M. Shearer, Illuminating the near-sonic rupture velocities of the intracontinental Kokoxili Mw 7.8 and Denali fault Mw 7.9 strike-slip earthquakes with global P wave back projection imaging, J. Geophys. Res., 114, doi: 10.1029/2008JB005738.

2009. Cochran, E. S., Y.-G. Li, P. M. Shearer, S. Barbot, Y. Fialko, and J. E. Vidale, Seismic and geodetic evidence for extensive, long-lived fault damage zones, Geology, 37, 315–318, doi: 10.1130/G25306A.1.

2009. Rychert, C. A., and P. M. Shearer, A global view of the lithosphere-asthenosphere boundary, Science, 324, doi: 10.1126/science.1169754.

2009. Zhang, J., P. Gerstoft, and P. M. Shearer, High-frequency P-wave seismic noise driven by ocean winds, Geophys. Res. Lett., 36, doi: 1029/2009GL037761.

2009. Lin, G., and P. M. Shearer, Evidence for water-filled cracks in earthquake source regions, Geophys. Res. Lett., 36, L17315, doi:10.1029/2009GL039098.

2009. Shearer, P.M., Introduction to Seismology, Second Edition, Cambridge University Press, Cambridge.

2008. Walker, K. T., M. A. Zumberge, M. A. H. Hedlin and P. M. Shearer, Methods for determining infrasound phase velocity direction with an array of line sensors, J. Acoust. Soc. Am., 124, 2090–2099, doi: 10.1121/1.2968675.

2008. Oki, S., and P. M. Shearer, Mantle Q structure from S-P differential attenuation measurements, J. Geophys. Res., 113, doi: 10.1029/2007JB005567.

2008. Shearer, P. M., and P. S. Earle, Observing and modeling elastic scattering in the deep Earth, in Advances in Geophysics, Volume 50: Earth Heterogeneity and Scattering Effects on Seismic Waves, H. Sato and M. C. Fehler (ed.), Elsevier Ltd., Oxford, p. 167-193.

2008. Lawrence, J. F., and P. M. Shearer, Imaging mantle transition zone thickness with SdS-SS finite-frequency sensitivity kernels, Geophys. J. Int., 174, 143–158, doi: 10,1111/j.1365-246X.2007.03673.x.

2008. Allmann, B.P., P. M. Shearer, and E. Hauksson, Spectral discrimination between quarry blasts and earthquakes in southern California, Bull. Seismol. Soc. Am., 98, 2073–2079, doi: 10.1785/0120070215.

2008. Peng, Z., K. D. Koper, J. E. Vidale, F. Leyton, and P. Shearer, Inner-core fine-scale structure from scattered waves recorded by LASA, J. Geophys. Res., 113, doi: 10.1029/2007JB005412.

2008. Lin, G., P. M. Shearer and E. Hauksson, A search for temporal variations in station terms in southern California from 1984 to 2002, Bull. Seismol. Soc. Am., 98, 2118–2132, doi: 10.1785/0120070243.

2008. Gerstoft, P., P. M. Shearer, N. Harmon, and J. Zhang, Global P, PP, and PKP wave microseisms observed from distant storms, Geophys. Res. Lett., 35, doi: 100.1029/2008GL036111.

2008. Houser, C., G. Masters, M. Flanagan, and P. Shearer, Determination and analysis of long-wavelength transition zone structure using SS precursors, 
Geophys. J. Int., 174, 178–194, doi:10.1111/j.1365-246X.2008.03719.x.

2008. Houser, C., G. Masters, P. Shearer, and G. Laske, Shear and compressional velocity models of the mantle from cluster analysis of long-period waveforms, 
Geophys. J. Int., 174, 195–212, doi:10.1111/j.1365-246X.2008.03763.x.

2007. Prieto, G.A., D.J. Thomson, F.L. Vernon, P.M. Shearer, and R.L. Parker, Confidence intervals of earthquake source parameters, Geophys. J. Int., 168, 1227-1234, doi: 10.1111/j.1365-246X.2006.03257.x.

2007. Guzofski, C.A., J.H. Shaw, G. Lin, and P.M. Shearer, Seismically active wedge structure beneath the Coalinga anticline, San Joaquin basin, California, J. Geophys. Res., 112, B3, B03S05, doi:10.1029/2006JB004465.

2007. Lin, G., and P. Shearer, Estimating local Vp/Vs ratios within similar event clusters, Bull. Seismol. Soc. Am., 97, 379-388, doi: 10.1785/0120060115.

2007. Allmann, B.P., and P.M. Shearer, A high-frequency secondary event during the 2004 Parkfield earthquake, Science, 318, 1279, doi: 10.1126/science.1146537.

2007. Allmann, B.P., and P.M. Shearer, Spatial and temporal stress drop variations in small earthquakes near Parkfield, California, J. Geophys. Res., 112, B4, B04305, doi:10.1029/2006JB004395.

2007. Bulow, R.C., C.L. Johnson, B.G. Bills, and P.M. Shearer, Temporal and spatial properties of some deep moonquake clusters, J. Geophys. Res., 112, doi: 10.1029/2006JE002847.

2007. Shearer, P.M., Seismic scattering in the deep Earth, in Treatise on Geophysics, Volume 1: Deep Earth Structure, Schubert, G. (ed.), Elsevier Ltd., Oxford, p. 695-730.

2007. Ishii, M., P.M. Shearer, H. Houston, and J.E. Vidale, Teleseismic P wave imaging of the 26 December 2004 Sumatra-Andaman and 28 March 2005 Sumatra earthquake ruptures using the Hi-net array, J. Geophys. Res., 112, B11307, doi:10.1029/2006JB004700.

2007. Plesch, A., J.H. Shaw, C. Benson, W.A. Bryant, S. Carena, M. Cooke, J. Dolan, G. Fuis, E. Gath, L. Grant, E. Hauksson, T. Jordan, M. Kamerling, M. Legg, S. Lindvall, H. Magistrale, C. Nicholson, N. Niemi, M. Oskin, S. Perry, G. Planansky, T. Rockwell, P. Shearer, C. Sorlien, M. P. Suss, J. Suppe, J. Treiman, and R. Yeats, Community fault model (CFM) for southern California, Bull. Seismol. Soc. Am., 97, 1793–1802.

2007. Lin, G., P. M. Shearer, E. Hauksson and C. H. Thurber, A three-dimensional crustal seismic velocity model for southern California from a composite event method, J. Geophys. Res., 112, doi: 10.1029/2007JB004977.

2007. Lin, G., P. M. Shearer and E. Hauksson, Applying a three-dimensional velocity model, waveform cross correlation, and cluster analysis to locate southern California seismicity from 1981 to 2005, J. Geophys. Res., 112, B12309, doi: 10.1029/2007JB004986.

2006. Lawrence, J. F., and P. M. Shearer, A global study of transition zone thickness using receiver functions, J. Geophys. Res., 111, B06307, doi:10.1029/2005JB003973

2006. Warren, L.M. and P.M. Shearer, Systematic determination of earthquake rupture directivity and fault planes from analysis of long-period P-wave spectra, Geophys. J. Int., 164, 46-62, doi: 10.1111/j.1365-246X.2005.02769.x

2006. Hauksson, E., and P. M. Shearer, Attenuation models (Qp and Qs) in three dimensions of the southern California crust: Inferred fluid saturation at seismogenic depths, J. Geophys. Res., 111, B05302, doi:10.1029/2005JB003947

2006. Lawrence, J. F., P. M. Shearer, and G. Masters, Mapping attenuation beneath North America using waveform cross-correlation and cluster analysis, Geophys. Res. Lett., 33, L07315, doi:10.1029/2006GL025813

2006. Lin, G., P. Shearer and Y. Fialko, Obtaining absolute locations for quarry seismicity using remote sensing data, Bull. Seismol. Soc. Am., 96, 722-728, doi: 10.1785/0120050146

2006. Shearer, P. M., G. A. Prieto, and E. Hauksson, Comprehensive analysis of earthquake source spectra in southern California, J. Geophys. Res., 111, B06303, doi:10.1029/2005JB003979

2006. Vidale, J. E., and P. M. Shearer, A survey of 71 earthquake bursts across southern California: Exploring the role of pore fluid pressure fluctuations and aseismic slip as drivers, J. Geophys. Res., 111, B05312, doi:10.1029/2005JB004034

2006. Lawrence, J. F., and P. M. Shearer, A global study of transition zone thickness using receiver functions, J. Geophys. Res., 111, B06307, doi:10.1029/2005JB003973.

2006. Lin, G. and P. Shearer, The COMPLOC earthquake location package, Seismol. Res. Lett., 77, 440-444.

2006. Cochran, E.S., and P.M. Shearer, Infrasound events detected with the Southern California Seismic Network, Geophys. Res. Lett., 33, L19803, doi:10.1029/2006GL026951.

2006. Lawrence, J.F., and P.M. Shearer, Constraining seismic velocity and density for the mantle transition zone with reflected and transmitted waveforms, Geochem. Geophys. Geosyst., 7, Q10012, doi:10.1029/2006GC001339.

2006. Vidale, J.E., K.L. Boyle, and P.M. Shearer, Crustal earthquake bursts in California and Japan: Their patterns and relation to volcanoes, Geophys. Res. Lett., 33, L20313, doi:10.1029/2006GL027723.

2006. Prieto, G.A., R.L. Parker, F.L. Vernon, P.M. Shearer and D.J. Thomson, Uncertainties in earthquake source spectrum estimation using empirical Green functions, in Earthquakes: Radiated Energy and the Physics of Faulting, AGU Geophysical Monograph Series 170, doi:10.1029/170GM08.

2005. Bulow, R.C., C.L. Johnson and P.M. Shearer, New events discovered in the Apollo lunar seismic data, J. Geophys. Res., 110, doi: 10.1029/2005JE002414

2005. Hauksson, E. and P. Shearer, Southern California hypocenter relocation with waveform cross-correlation, Part 1: Results using the double-difference method, Bull. Seismol. Soc. Am., 95, 896-903, doi: 10.1785/0120040167

2005. Ishii, M., P.M. Shearer, H. Houston and J.E. Vidale, Extent, duration and speed of the 2004 Sumatra-Andaman earthquake imaged by the Hi-Net array, Nature, doi: 10.1038/nature03675

2005. Lin., G. and P. Shearer, Tests of relative earthquake location techniques using synthetic data, J. Geophys. Res., 110, B4, B04304, doi: 10.1029/2004JB003380

2005. Shearer, P., E. Hauksson and G. Lin, Southern California hypocenter relocation with waveform cross-correlation, Part 2: Results using source-specific station terms and cluster analysis, Bull. Seismol. Soc. Am., 95, 904-915, doi: 10.1785/0120040168

2005. Walker, K.T., M. Ishii and P.M. Shearer, Rupture details of the 28 March 2005 Sumatra Mw 8.6 earthquake imaged with teleseismic P waves, Geophys. Res. Lett., 32, L24303, doi: 10.1029/2005GL024395

2005. Warren, L.M. and P.M. Shearer, Using the effects of depth phases on P-wave spectra to determine earthquake depths, Bull. Seismol. Soc. Am., 95, 173-184

2004. Grant, L.B. and P.M. Shearer, Activity of the offshore Newport-Inglewood Rose Canyon fault zone, coastal southern California, from relocated microseismicity, Bull. Seismol. Soc. Am., 94, 747-752

2004. Hauksson, E., P. Shearer and J. Vidale, Converting advances in seismology into earthquake science, EOS Trans. AGU (article), 85, 3-8

2004. Konter J.G., H. Staudigel, S.R. Hart and P.M. Shearer, Seafloor seismic monitoring of an active submarine volcano: Local seismicity at Vailulu'u Seamount, Samoa, Geochem. Geophys. Geosyst., 5, Q06007, doi: 10.1029/2004GC000702

2004. Prieto, G., P.M. Shearer, F.L. Vernon and D. Kilb, Earthquake source scaling and self-similarity estimation from stacking P and S spectra, J. Geophys. Res., 109, B8, B08310, doi :10.1029/2004JB003084

2004. Shearer, P.M. and P.S Earle, The global short-period wavefield modelled with a Monte Carlo seismic phonon method, Geophys. J. Int., 158, 1103-1117

2004. Wolfe, C.J., P.G. Okubo, G. Ekstrom, M. Nettles and P.M. Shearer, Characteristics of deep (>= 13 km) Hawaiian earthquakes and Hawaiian earthquakes west of 155.55W, Geochem. Geophys. Geosyst., 5, Q04006, doi: 10.1029/2003GC000618

2003. Bergman, M. and P. Shearer, Preface to SEDI Special Issue, Phys. Earth Planet. Int., 140, 1-2

2003. Hardebeck, J.L. and P.M. Shearer, Using S/P amplitude ratios to constrain the focal mechanisms of small earthquakes, Bull. Seismol. Soc. Am., 93, 2434-2444

2003. Shearer, P.M., J.L. Hardebeck, L. Astiz, and K.B. Richards-Dinger, Analysis of similar event clusters in aftershocks of the 1994 Northridge, California, earthquake, J. Geophys. Res., 108(B1), 2035, doi: 10.1029/2001JB000685

2003. Wolfe, C.J., P.G. Okubo and P.M. Shearer, Mantle fault zone beneath Kilauea volcano, Hawaii, Science, 300, 478-480

2002. Fialko, Y., D. Sandwell, D. Agnew, M. Simons, P. Shearer and B. Minsters, Deformation on Nearby Faults Induced by the 1999 Hector Mine Earthquake, Science, 297, 1858-1862

2002. Hardebeck, J.L. and P.M. Shearer, A new method for determining first-motion focal mechanisms, Bull. Seismol. Soc. Am., 92, 2264-2276

2002. Hedlin, M.A.H., and P.M. Shearer, Probing mid-mantle heterogeneity using PKP coda waves, Phys. Earth Planet. Int., 130, 195-208

2002. Shearer, P.M., Parallel fault strands at 9-km depth resolved on the Imperial Fault, Southern California, Geophys. Res. Lett., 29(14), doi: 10.1029/2002GL015302

2002. Warren, L.M., and P.M. Shearer, Mapping lateral variations in upper mantle attenuation structure by stacking P and PP spectra, J. Geophys. Res., 107(B12), 2342, doi: 10.1029/2001JB001195

2002. Reif, C., P.M. Shearer and L. Astiz, Evaluating the performance of global seismic stations, Seismol. Res. Lett., 73, 46-56

2001. Earle, P.S. and P.M. Shearer, Distribution of fine-scale mantle heterogeneity from observations of Pdiff coda, Bull. Seismol. Soc. Am., 91, 1875-1881

2001. Nikolaidis, R.M., Y. Bock, P.J. de Jonge, P. Shearer, D.C. Agnew and M.V. Domselaar, Seismic wave observations with the Global Positioning System, J. Geophys. Res., 106, 21,897-21,916

2001. Schulte-Pelkum, V., G. Masters and P.M. Shearer, Upper-mantle anisotropy from long-period P polarization, J. Geophys. Res., 106, 21,917-21,934

2001. Shearer, P.M., Improving global seismic event locations using source-receiver reciprocity, Bull. Seismol. Soc. Am., 91, 594-603

2000. Astiz, L., and P.M. Shearer, Earthquake relocations in the inner Continental Borderland, offshore southern California, Bull. Seismol. Soc. Am., 90, 425-449

2000. Astiz, L., P.M. Shearer and D.C. Agnew, Precise relocations and stress-change calculations for the Upland earthquake sequence in southern California, J. Geophys. Res., 105, 2937-2853

2000. Hedlin, M.A.H. and P.M. Shearer, An analysis of large scale variations in small-scale mantle heterogeneity using Global Seismic Network recordings of precursors to PKP, J. Geophys. Res., 105, 13,655-13,673

2000. Richards-Dinger, K.B. and P.M. Shearer, Earthquake locations in southern California obtained using source specific station terms, J. Geophys. Res., 105, 10,939-10,960

2000. Shearer, P.M., Upper mantle seismic discontinuities, in Earth's Deep Interior: Mineral Physics and Tomography from the Atomic to the Global Scale, AGU Geophysical Monograph 117, 115-131

2000. Sheehan, A.F., P.M. Shearer, H.J. Gilbert and K.G. Dueker, Seismic migration processing of P-SV converted phases for mantle discontinuity structure beneath the Snake River Plain, western United States, J. Geophys. Res., 105, 19,055-19,065

2000. Warren, L.M. and P.M. Shearer, Investigating the frequency dependence of mantle Q by stacking P and PP spectra, J. Geophys. Res., 105, 25,391-25,402

1999. Flanagan, M.P. and P.M. Shearer, A map of topography on the 410-km discontinuity from PP precursors, Geophys. Res. Lett., 26, 549-552

1999. Shaw, J.H. and P.M. Shearer, An elusive blind-thrust fault beneath metropolitan Los Angeles, Science, 283, 1516-1518

1999. Shearer, P.M. and M.P. Flanagan, Seismic velocity and density jumps across the 410- and 660-kilometer discontinuities, Science, 285, 1545-1548

1999. Shearer, P.M., M.P. Flanagan and M.A.H. Hedlin, Experiments in migration processing of SS precursor data to image upper mantle discontinuity structure, J. Geophys. Res., 104, 7229-7242

1999. Levander, A., E.D. Humphreys, G. Ekstrom, A.S. Meltzer and P.M. Shearer, Proposed project would give unprecedented look under North America, EOS Trans. AGU (article), 80, 245-251

1999. Shearer, P.M., Introduction to Seismology, Cambridge University Press, Cambridge

1998. Earle, P.S. and P.M. Shearer, Observations of high-frequency scattered energy associated with the core phase PKKP, Geophys. Res. Lett., 25, 405-408

1998. Flanagan, M.P. and P.M. Shearer, Global mapping of topography on transition zone velocity discontinuities by stacking SS precursors, J. Geophys. Res., 103, 2673-2692

1998. Flanagan, M.P. and P.M. Shearer, Topography on the 410-km seismic velocity discontinuity near subduction zones from stacking of sS, sP, and pP precursors, J. Geophys. Res., 103, 21,165-21,182

1998. Shearer, P.M., Evidence for a fault at 18 km depth beneath Oak Ridge, southern California, from a cluster of small earthquakes, Bull. Seismol. So. Am., 88, 1327-1336

1998. Shearer, P.M., M.A.H. Hedlin and P.S. Earle, PKP and PKKP precursor observations: Implications for the small-scale structure of the deep mantle and core, The Core-Mantle Boundary Region, AGU Geodynamics Series, 28, 37-55

1997. Earle, P.S. and P.M. Shearer, Observations of PKKP precursors used to estimate small-scale topography on the core-mantle boundary, Science, 277, 667-670

1997. Hedlin, M.A.H., P.M. Shearer and P.S. Earle, Seismic evidence for small-scale heterogeneity throughout the Earth's mantle, Nature, 387, 145-150

1997. Richards-Dinger, K.B. and P.M. Shearer, Estimating crustal thickness in southern California by stacking PmP arrivals, J. Geophys. Res., 102, 15,211-15,224

1997. Shearer, P.M. and L. Astiz, Locating nuclear explosions using waveform cross-correlation, 19th Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty, Proceedings, 301-309

1997. Shearer, P.M., Improving local earthquake locations using the L1-norm and waveform cross-correlation: Application to the Whittier Narrows, California, aftershock sequence, J. Geophys. Res., 102, 8269-8283

1996. Astiz, L., P. Earle and P. Shearer, Global stacking of broadband seismograms, Seis. Res. Lett., 67, 8-18

1996. Bhattacharyya, J., G. Masters and P. Shearer, Global variations of shear wave attenuation in the upper mantle, J. Geophys Res., 101, 22,273-22,289

1996. Shearer, P.M., Transition zone velocity gradients and the 520-km discontinuity, J. Geophys. Res., 101, 3053-3066

1995. Haase, J.S., P.M. Shearer and R.C. Aster, Constraints on temporal variations in velocity near Anza, California, from analysis of similar event pairs, Bull. Seismol. Soc. Am., 85, 194-206

1995. Kendall, J.-M. and P.M. Shearer, Structure of the lowermost mantle beneath the southwest Pacific, southeastern Asia and Australasia, Phys. Earth Planet. Int., 92, 85-98

1995. Masters, T.G. and P.M. Shearer, Seismic properties of the Earth: elastic and anelastic, Global Earth Physics, A Handbook of Physical Constants, AGU Reference Shelf 1, 88-103

1995. Shearer, P.M., Seismic discontinuities in Earth's upper mantle, McGraw Hill Yearbook of Science and Technology, McGraw Hill, New York, 79-81

1995. Shearer, P.M., Seismic studies of the upper mantle and transition zone, Reviews of Geophysics, Supplement, U.S. National Report to IUGG 1991-1994, 321-324

1994. Kendall, J.-M. and P.M. Shearer, Lateral variations in D" thickness from long-period shear-wave data, J. Geophys. Res., 99, 11,575-11,590

1994. Shearer, P.M., Constraints on inner core anisotropy from ISC PKP(DF) data, J. Geophys. Res., 99, 19,647-19,659

1994. Shearer, P.M., Global seismic event detection using a matched filter on long-period seismograms, J. Geophys. Res., 99, 13,713-13,725

1994. Earle, P.S. and P.M. Shearer, Characterization of global seismograms using an automatic picking algorithm, Bull. Seismol. Soc. Am., 84, 366-376

1994. Shearer, P.M., Imaging Earth's seismic response at long periods, EOS Trans. AGU (article), 75, 449-452

1993 (this article also appeared in AGU's Geophysics News 1993, p 7-8). Shearer, P.M., Imaging Earth's upper mantle, EOS Trans. AGU (article), 74, 602

1993. Phipps Morgan, J. and P.M. Shearer, Seismic constraints on mantle flow and topography of the 660-km discontinuity: evidence for whole-mantle convection, Nature, 365, 506-511

1993. Bhattacharyya, J., P. Shearer and G. Masters, Inner core attenuation from short-period PKP(BC) versus PKP(DF) waveforms, Geophys. J. Int., 114, 1-11

1993. Shearer, P.M., Global mapping of upper mantle reflectors from long-period SS precursors, Geophys. J. Int., 115, 878-904

1992. Shearer, P., A mantle thermometer, Nature (News and View), 356, 662-663

1992. Shearer, P.M. and T.G. Masters, Global mapping of topography on the 660 km discontinuity, Nature, 355, 791-796

1992. Aster, R.C. and P.M. Shearer, Initial shear wave particle motions and stress constraints at the Anza Seismic Network, Geophys. J. Int., 108, 740-748

1991. Shearer, P.M., Constraints on upper-mantle discontinuities from observations of long-period reflected and converted phases, J. Geophys. Res., 96, 18,147-18,182

1991. Aster, R.C. and P.M. Shearer, High-frequency borehole seismograms recorded in the San Jacinto Fault Zone, Southern California, Part 1. Polarizations, Bull. Seismol. Soc. Am., 81, 1057-1080

1991. Aster, R.C. and P.M. Shearer, High-frequency borehole seismograms recorded in the San Jacinto Fault Zone, Southern California, Part 2. Attenuation and site effects, Bull. Seismol. Soc. Am., 81, 1081-1100

1991. Aster, R.C., P.M. Shearer, and J.C. Berger, Reply to Comment on ``Quantitative measurements of shear wave polarizations at the Anza Seismic Network, Southern California: implications for shear wave splitting and earthquake prediction'', J. Geophys.

1991. Minster, J.B., S.M. Day, and P.M. Shearer, The transition to the elastic regime in the vicinity of an underground explosion, AGU Geophys. Monograph, 65, 229-238

1991. Shearer, P.M. and K.M. Toy, PKP(BC) versus PKP(DF) differential travel times and aspherical structure in the Earth's inner core, J. Geophys. Res., 96, 2233-2247

1991. Shearer, P.M., Imaging global body-wave phases by stacking long-period seismograms, J. Geophys. Res., 96, 20,353-20,364

1990. Shearer, P.M., Seismic imaging of upper-mantle structure with new evidence for a 520-km discontinuity, Nature, 344, 121-126

1990. Aster, R.C., P.M. Shearer, and J. Berger, Quantitative measurements of shear wave polarizations at the Anza Seismic Network, Southern California: implications for shear wave splitting and earthquake prediction, J. Geophys. Res., 95, 12,449-12,473

1990. Masters, T.G. and P.M. Shearer, Summary of seismological constraints on the structure of the Earth's core, J. Geophys. Res., 95, 21,691-21,695

1990. Shearer, P.M. and T.G. Masters, The density and shear velocity contrast at the inner core boundary, Geophys. J. Int., 102, 491-498

1989. Chapman, C.H. and P.M. Shearer, Ray tracing in azimuthally anisotropic media: 2. Quasi-shear wave coupling, Geophys. J., 96, 65-83

1989. Hyndman, R.D. and P.M. Shearer, Water in the lower continental crust: Modelling magnetotelluric and seismic reflection results, Geophys. J. Int., 98, 343-365

1989. Shearer, P.M. and C.H. Chapman, Ray tracing in azimuthally anisotropic media: 1. Results for models of aligned cracks in the upper crust, Geophys. J., 96, 51-64

1988. Shearer, P.M., K.M. Toy, and J.A. Orcutt, Axi-symmetric earth models and inner core anisotropy, Nature, 333, 228-232

1988. Shearer, P.M. and C.H. Chapman, Ray tracing in anisotropic media with a linear gradient, Geophys. J., 94, 575-580

1988a. Shearer, P.M., Cracked media, Poisson's ratio, and the structure of the upper oceanic crust, Geophys. J., 92, 357-362

1988b. Shearer, P.M., The fossil roots of continents, Nature (News and View), 335, 11-12

1988c. Shearer, P.M., Synthetic seismogram modeling of shear-wave splitting in VSP data from The Geysers, California, Geophys. Res. Lett., 15, 1085-1088

1987. Shearer, P.M., Slow waves in young basalt, Nature (News and View), 330, 312-313

1987. Shearer, P.M. and J.A. Orcutt, Surface and near-surface effects on seismic waves - theory and borehole seismometer results, Bull. Seismol. Soc. Am., 77, 1168-1196

1987. Whitmarsh, R.B., J.A. Orcutt, T.H. Jordan, R.G. Adair, and P.M. Shearer, Velocity bounds on the seismic structure of Mesozoic crust and upper mantle in the Southwest Pacific Basin from downhole observations at Deep Sea Drilling Project Hole 595B, In

1987a. Shearer, P.M., J.A. Orcutt, T.H. Jordan, R.B. Whitmarsh, I.I. Kim, R.G. Adair, and M.S. Burnett, The Ngendei seismic refraction experiment at DSDP Hole 595B: ocean bottom seismometer data and evidence for crustal and upper mantle anisotropy, Initia

1987b. Shearer, P.M., R.G. Adair, J.A. Orcutt, and T.H. Jordan, Simultaneous borehole and ocean bottom seismometer recordings of earthquakes and explosions: results from the 1983 Ngendei experiment at Deep Sea Drilling Project Hole 595B, Initial Rep. Deep

1986. Shearer, P.M. and J.A. Orcutt, Compressional and shear wave anisotropy in the oceanic lithosphere - the Ngendei seismic refraction experiment, Geophys. J. R. Astron. Soc., 87, 967-1003

1986. Shearer, P.M., Anisotropy in the oceanic lithosphere - the Ngendei seismic refraction experiment, University of California, San Diego, Ph.D. dissertation

1985. Shearer, P. and J. Orcutt, Anisotropy in the oceanic lithosphere - theory and observations from the Ngendei seismic refraction experiment in the south-west Pacific, Geophys. J. R. Astron. Soc., 80, 493-526

1982. Shearer, P. and D. Oppenheimer, A dipping moho and crustal low-velocity zone from Pn arrivals at the Geysers-Clearlake, California, Bull. Seismol. Soc. Am., 72, 1551-1566