Peter Shearer

Professor/Researcher

Room: Munk Lab 330

Institute of Geophysics and Planetary Physics,
Scripps Institution of Oceanography,
University of California San Diego,
La Jolla, CA 92093-0225, USA.

Telephone: (858) 534-2260

Email: pshearer@ucsd.edu

Website: http://mahi.ucsd.edu/shearer/index.html

Research Summary for 2006: Download PDF (216.905KB)

Research Interests:

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

Courses Taught:

• ERTH211 (Research Seminar)
• SIO1 (The Planets)
• SIO227A (Introduction to Seismology)
• SIO227C (Advanced Seismology II)
• SIO233 (Intro to Computing at SIO)
• SIO239 (Special Topics in Geophysics)
• SIO296 (Special Topics/Marine Biology)
• SIO298 (Spec Studies/Marine Sciences)
• SIO299 (Research)

Recent publications: ^†

• 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. 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. 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.
• 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. 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. 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.
• 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. 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.
• 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. 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. 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. 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. 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. 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. 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.
• 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. 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. 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. 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. 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. 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. 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. 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. 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.
• 2006. Lin, G. and P. Shearer, The COMPLOC earthquake location package, Seismol. Res. Lett., 77, 440-444.
• 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. 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
• 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
• 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. 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. 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. 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. 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. 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
• 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
• 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. 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. 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. Hauksson, E., P. Shearer and J. Vidale, Converting advances in seismology into earthquake science, EOS Trans. AGU (article), 85, 3-8
• 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
• 2003. Wolfe, C.J., P.G. Okubo and P.M. Shearer, Mantle fault zone beneath Kilauea volcano, Hawaii, Science, 300, 478-480
• 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. 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. Bergman, M. and P. Shearer, Preface to SEDI Special Issue, Phys. Earth Planet. Int., 140, 1-2
• 2002. Reif, C., P.M. Shearer and L. Astiz, Evaluating the performance of global seismic stations, Seismol. Res. Lett., 73, 46-56
• 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. 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. Hedlin, M.A.H., and P.M. Shearer, Probing mid-mantle heterogeneity using PKP coda waves, Phys. Earth Planet. Int., 130, 195-208
• 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. 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
• 2001. Shearer, P.M., Improving global seismic event locations using source-receiver reciprocity, Bull. Seismol. Soc. Am., 91, 594-603
• 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. 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. 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
• 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
• 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. 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. 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. 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. 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. Astiz, L., and P.M. Shearer, Earthquake relocations in the inner Continental Borderland, offshore southern California, Bull. Seismol. Soc. Am., 90, 425-449
• 1999. Shearer, P.M., Introduction to Seismology, Cambridge University Press, Cambridge
• 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., 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. Shearer, P.M. and M.P. Flanagan, Seismic velocity and density jumps across the 410- and 660-kilometer discontinuities, Science, 285, 1545-1548
• 1999. Shaw, J.H. and P.M. Shearer, An elusive blind-thrust fault beneath metropolitan Los Angeles, Science, 283, 1516-1518
• 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
• 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
• 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. 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. 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. 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
• 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
• 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. 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. 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. 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
• 1996. Shearer, P.M., Transition zone velocity gradients and the 520-km discontinuity, J. Geophys. Res., 101, 3053-3066
• 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. Astiz, L., P. Earle and P. Shearer, Global stacking of broadband seismograms, Seis. Res. Lett., 67, 8-18
• 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
• 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. 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. 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. 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
• 1994. Shearer, P.M., Imaging Earth's seismic response at long periods, EOS Trans. AGU (article), 75, 449-452
• 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., Global seismic event detection using a matched filter on long-period seismograms, J. Geophys. Res., 99, 13,713-13,725
• 1994. Shearer, P.M., Constraints on inner core anisotropy from ISC PKP(DF) data, J. Geophys. Res., 99, 19,647-19,659
• 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
• 1993. Shearer, P.M., Global mapping of upper mantle reflectors from long-period SS precursors, Geophys. J. Int., 115, 878-904
• 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. 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 (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
• 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
• 1992. Shearer, P.M. and T.G. Masters, Global mapping of topography on the 660 km discontinuity, Nature, 355, 791-796
• 1992. Shearer, P., A mantle thermometer, Nature (News and View), 356, 662-663
• 1991. Shearer, P.M., Imaging global body-wave phases by stacking long-period seismograms, J. Geophys. Res., 96, 20,353-20,364
• 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. 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. 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. 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. 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. 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
• 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
• 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. 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. Shearer, P.M., Seismic imaging of upper-mantle structure with new evidence for a 520-km discontinuity, Nature, 344, 121-126
• 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
• 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. Chapman, C.H. and P.M. Shearer, Ray tracing in azimuthally anisotropic media: 2. Quasi-shear wave coupling, Geophys. J., 96, 65-83
• 1988c. Shearer, P.M., Synthetic seismogram modeling of shear-wave splitting in VSP data from The Geysers, California, Geophys. Res. Lett., 15, 1085-1088
• 1988b. Shearer, P.M., The fossil roots of continents, Nature (News and View), 335, 11-12
• 1988a. Shearer, P.M., Cracked media, Poisson's ratio, and the structure of the upper oceanic crust, Geophys. J., 92, 357-362
• 1988. Shearer, P.M. and C.H. Chapman, Ray tracing in anisotropic media with a linear gradient, Geophys. J., 94, 575-580
• 1988. Shearer, P.M., K.M. Toy, and J.A. Orcutt, Axi-symmetric earth models and inner core anisotropy, Nature, 333, 228-232
• 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
• 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
• 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
• 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. Shearer, P.M., Slow waves in young basalt, Nature (News and View), 330, 312-313
• 1986. Shearer, P.M., Anisotropy in the oceanic lithosphere - the Ngendei seismic refraction experiment, University of California, San Diego, Ph.D. dissertation
• 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
• 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