Gabi's Home Page .

The very first time I visited IGPP in 1990, I encountered a plaque reminding us that this site has been inhabited for thousands of years before IGPP was built. Before Europeans first set foot on the local coast in 1542, this was the land of the Kumeyaay Indigenous People. Today, the Kumeyaay continue to maintain their political sovereignty and cultural traditions as vital members of the San Diego community. I am honored to work and live on their land which they call Mat Kulaaxuuy.
my view, almost

the 40th; another one
Mr. S.

LAST MODIFIED: 8 August 2024 (new pubs)
MODIFIED: 1 March 2021 (new pubs)
MODIFIED: 19 May 2016 (new office number)
MODIFIED: 20 August 2013 (link to CRUST1.0 added)
Work Address: Gabi Laske
              IGPP-0225
              U.C. San Diego
              La Jolla, Ca 92093-0225

Office phone: (858) 534-8774 
Fax:          (858) 534-5332 
Email:        glaske@ucsd.edu
.

Courses

SIO15 (Natural Disasters) Web site
SIO 227b 2004 Web site
A brief page on volcanoes and volcanism in S.D. county

Publications

Directions to my office

Geophysics at Karlsruhe, the place I come from.

Black Forest Observatory, the quietest site on Earth

Projects:

The Hawaiian PLUME Experiment

The centerpiece of this project is a two-phase OBS deployment to image the Hawaiian mantle plume and its plumbing system.
The phases operated between January 2005 and June 2007. First results for evidence of a deep-reaching mantle plume have been published in December 2009.
This work is funded by the OCE section of NSF. Matching funds are provided by the SIO director's office.

A Global Crustal Model at 1x1 degrees (August 2013)

 This model is a comprehensive update of our previous global crustal models CRUST 5.1 and CRUST2.0. CRUST1.0 takes advantage of our digital 1deg sediment map (see below) and our new (and ongoing) compilation crustal database.
This and related work has been funded by NSF, DoD and an IGPP-mini grant with LLNL.

OBS Orientations

PhD student Adrian Doran wrote a Python computer program for automated determination of Rayleigh wave arrival angles, and ulitmately the orientation of the horizontal seismometer components. The program, DLOPy, is applicable to any instrument but is particularly useful for free-fall ocean bottom seismometers for which the orientation is unknown. The current version of the program relies on data retrieval through OBSPY.
This work is funded by the EAR and OCE sections of NSF.

Reference Earth Model Web Site

The time has come to revisit the question of spherically-symmetric reference Earth models and to begin the process of developing reference 3D models and datasets.
This Web site will be maintained to collect and distribute data, models and computer code from and to participants of the REM initiative.
This work is funded by the CSEDI section of NSF.

A global digital map of sediment thickness

This work has not been published (yet) but the sediment model is available to download (and widely used). Please provide feedback. This work was done in our spare time and funded by NSF.

The Scripps 3D mantle models

This page points you to our collection of 3D mantle models (old and new).
This work is a continuing effort to burn our spare time and, yes, funded by NSF.

Normal Modes and the Rotation of the Inner Core (July 2002)

 This page summarizes a contribution to an AGU Monograph on the Inner Core. This work was presented at the SEDI meeting July 2002, Lake Tahoe, CA, USA and AGU meetings.
This research was funded by NSF.

Project SWELL

 Seismic Wave Exploration of the Lower Lithosphere beneath the Hawaiian Swell.
We do have a model of 3D shear velocity structure beneath the pilot array.

This work is funded by the MG&G section of OCE-NSF.

CRUST 2.0: A global crustal model

 This model superseded CRUST5.1 and has been widely used. We no longer support the model since CRUST1.0 was released in July 2013 but we still provide the link here. We strongly recommend to use CRUST1.0 instead.

CRUST 5.1: A new global crustal model

 In collaboration with Walter D. Mooney (USGS, Menlo Park)

Global Maps of Long-Period Surface Wave Dispersion

Polarization of Long-Period Surface Waves/Station Misalignment

Publications:

 2024 -

Blackman, D.K., Talavera-Soza, S., Hung, R.-J., Collins, J.A. and Laske, G. , Pacific seafloor in the 40-52 Myr old portion of the Molokai to Murray corridor. Marine Geol., 469, 107246, doi: 10.1016/j.margeo.2024.107246, 2024. Paper at  : Marine Geology

2021 - 2023

Harmon, N., Laske, G., Crawford, W. and Rychert, C., Tilt Corrections for Normal Mode Observations on Ocean Bottom Seismic Data, an example from the PI-LAB experiment. Seismica, 1(1), doi: 10.26443/seismica.v1i1,196, 2022. Paper at  : Seismica

Frazer, W.D., Doran, A.K. and Laske, G. , Benchmarking automated Rayleigh-wave arrival angle measurements for USArray seismograms. Seismol. Res. Lett., 93(2A), 763-776, doi: 10.1785/0220210189, 2022. Paper at  : SRL

Mir, R.R., Parvez, I.A., Laske, G. and Gaur, V.K., Sensor orientation and noise analysis of the Kashmir-Zanskar seismic network: an appraisal from 2014 to 2020. J. Seismology, 18, doi: 10.1007/s10950-022-10090-z, 2022. Paper at  : Journal of Seismology

Ringler, A.T., Mason, D.B., Laske, G., Storm, T. and Templeton, M., Why do my squiggles look funny? A gallery of compromised seismic signals. Seismic. Res. Lett., 92(6), 3873-3886, doi: 10.1785/0220210094, 2021. Paper at  : SRL

Laske, G., Observations of Earth's normal modes on broadband ocean bottom seismometers. Frontiers in Earth Science, 9 doi: 10.3389/feart.2021.679958, 2021. Paper at  : Frontiers

Doran, A.K. and Laske, G., Melt-affected ocean crust and uppermost mantle near Hawaii - clues from ambient-noise phase velocity and seafloor compliance. Geophys. J. Int., 224, 843-857, doi: 10.1093/gji/ggaa470, 2021. Reprint upon request to glaske@ucsd.edu  : paper at GJI

2018 - 2020

Pachhai, S., Masters, G. and Laske, G., Probabilistic estimation of structure coefficients and their uncertainties, for inner-core sensitive modes, using matrix autoregression. Geophys. J. Int., 221, 1366--1383, doi: 10.1093/gji/ggaa077, 2020. Reprint upon request to glaske@ucsd.edu  : paper at GJI

Laske, G., Book Review of 'Seismic Ambient Noise' edited by Nori Kanata, Lucia Gualtieri and Andreas Fichtner. Geophys. J. Int., 221, 1667-1668, doi: 10.1093/gji/ggaa101, 2020. pdf reprint Paper at GJI

Lindner, F., Walter, F., Laske, G. and Gimbert, F., Glaciohydraulic seismic tremors on an Alpine glacier. The Cryosphere, 14, 287-308, doi:10.5194/tc-14-287-2020, 2020. Reprint upon request to glaske@ucsd.edu  : paper at The Cryosphere

Doran, A.K., Rapa, M., Laske, G., Babcock, J. and McPeak, S., Calibration of Differential Pressure Gauges Through in Situ Testing. Earth and Space Science, 6, doi:10.1029/2019EA000783, 2019. Reprint upon request to glaske@ucsd.edu  : paper at ESS

Doran, A.K. and Laske, G., Seismic structure of marine sediments and upper oceanic crust surrounding Hawaii. J. Geophys. Res., 124, 2038-2056, doi: 10.1029/2018jb016548, 2019. Reprint upon request to glaske@ucsd.edu  : paper at JGR

Lindner, F., Laske, G., Walter, F., and Doran, A.K., Crevasse-induced Rayleigh-wave azimuthal anisotropy on Glacier de la Plaine Morte, Switzerland, Ann. Glaciology, doi: 10.1017/aog.2018.25, 2018 Reprint upon request to glaske@ucsd.edu  : paper at Ann. Glac.

2015 - 2017

Agius, M.R., Rychert, C.A., Harmon, N. and Laske, G., Mapping the mantle transition zone beneath Hawaii from Ps receiver functions: Evidence for a hot plume and cold mantle downwellings. Earth Planet. Sci. Lett., 474, 226-236, 2017. Reprint upon request to glaske@ucsd.edu  : paper at EPSL

Blackman, D.K., Boyce, D.E., Castelnau, O., Dawson, P.R. and Laske, G., Effects of crystal preferred orientation on upper-mantle flow near plate boundaries: rheologic feedbacks and seismic anisotropy, Geophys. J. Int., 210, 1481-1493, 2017. Reprint upon request to glaske@ucsd.edu  : paper at GJI

Doran, A.K. and Laske, G., Ocean-bottom seismometer instrument orientations via automated Rayleigh-wave arrival angle measurements.Bull. Seismol. Soc. Am., 107, doi: 10.1785/0120160165, 2017. Reprint upon request to glaske@ucsd.edu  : paper at BSSA

Berger, J., Laske, G., Babcock, J. and Orcutt, J., An ocean bottom seismic observatory with near real-time telemetry. Earth and Space Science, 3, 68-77, DOI:10.1002/2015EA000137, 2016. Reprint upon request to glaske@ucsd.edu  : paper at ESS

Doran, A.K. and Laske, G., Infragravity waves and horizontal seafloor compliance. Journal of Geophysical Research, 121, 260-278, doi:10.1002/2015JB012511, 2016. Reprint upon request to glaske@ucsd.edu  : paper at JGR

Thomas, C. and Laske, G., D" observations in the Pacific from PLUME ocean bottom seismometer recordings. Geophysical Journal International, 200, 849-860, doi:10.1093/gji/ggu441, 2015. Reprint upon request to glaske@ucsd.edu  : paper at GJI

Laske, G. and Widmer-Schnidrig, R., Normal Mode & Surface Wave Observations. in: "Treatise on Geophysics, Volume 1: Seismology and Structure of the Earth", Vol. 1 (2nd edition), 117-165, 2015. pdf reprint

2012 - 2014

Ma, Z. Masters, T.G., Laske, G. and Pasyanos, M., A comprehensive dispersion model of surface wave phase and group velocity for the globe. Geophysical Journal International, 199, 113-135, doi:10.1093/gji/ggu246, 2014. Reprint upon request to glaske@ucsd.edu  : paper at GJI

Pasyanos, M.E., Masters, T.G. Laske, G. and Ma Z., LITHO1.0: An updated crust and lithospheric model of the Earth. Journal of Geophysical Research, 119, 2153-2172, doi:10.1002/2013jb010626, 2014. Reprint upon request to glaske@ucsd.edu  : paper at JGR

Rychert, C.A., Laske, G., Harmon, N. and Shearer, P.M., Seismic imaging of melt in a displaced Hawaiian plume. Nature Geoscience, 6, 657-660, doi:10.1038/ngeo1878, 2013. Reprint upon request to glaske@ucsd.edu  : paper at Nature Geoscience

Brown, P.G. and 31 co-authors, A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors. Nature, 238-241, doi:10.1038/nature12741, 2013. Reprint upon request to glaske@ucsd.edu  : paper at Nature

Collins, J.A., Wolfe, C.J. and Laske, G., Shear wave splitting at the Hawaiian hot spot from the PLUME land and ocean bottom seismometer deployments. Geochemistry Geophysics Geosystems. 13 DOI:10.1029/2011gc003881, 2012. Reprint upon request to glaske@ucsd.edu  : paper at G-cubed

Yang, Z.H., Sheehan, A.F., Collins, J.A. and Laske, G., The character of seafloor ambient noise recorded offshore New Zealand: Results from the MOANA ocean bottom seismic experiment. Geochemistry Geophysics Geosystems, 13, DOI: 10.1029/2012GC004201, 2012. Reprint upon request to glaske@ucsd.edu   paper at G-cubed

2009 - 2011

Laske, G., Markee, A., Orcutt, J.A. Wolfe, C.J., Collins, J.A., Solomon, S.C., Detrick, R.S., , Bercovici, D. and Hauri, E.H., Asymmetric Shallow Mantle Structure beneath the Hawaiian Swell - Evidence from Rayleigh Waves Recorded by the PLUME network. Geophys. J. Int., 187, 1725-1742, 2011. download reprint (incl supplement)   paper at gji

Anchieta, M.C., Wolfe, C.J., Pavlis, G.L., Vernon, F.L., Eakins, J.A., Solomon, S.C., Laske, G. and Collins, J.A., Seismicity around the Hawaiian Islands Recorded by the PLUME Seismometer Networks: Insight into Faulting near Maui, Molokai, and Oahu. Bull. Seismol. Soc. Am., 101, 1742-1758, 2011. Reprint upon request to glaske@ucsd.edu   paper at BSSA

Tian, Y., Zhou, Y., Sigloch, K., Nolet, G. and Laske, G., Structure of North American mantle constrained by simlutaneous inversion of multiple-frequency $SH, SS$ and Love waves. J. Geophys. Res., 116, B02307, doi:10.1029/2010JB007704, 2011. Reprint upon request to glaske@ucsd.edu   paper at JGR

Wolfe, C.J., Solomon, S.C., Laske, G., Collins, J.A., Detrick, R.S., Orcutt, J.A., Bercovici, D. and Hauri, E.H., Mantle P-wave velocity structure beneath the Hawaiian hotspot. Earth Planet Sci. Lett., 303, 267-280, 2011. Reprint upon request to glaske@ucsd.edu   paper at EPSL

Leahy, G.M., Collins, J.A., Wolfe, C.J., Laske, G. and Solomon, S.C., Underplating of the Hawaiian Swell: evidence from teleseismic receiver functions. Geophys. J. Int., 183, 313-329, 2010. Reprint upon request to glaske@ucsd.edu   paper at GJI

Wolfe, C.J., Solomon, S.C., Laske, G., Collins, J.A., Detrick, R.S., Orcutt, J.A., Bercovici, D. and Hauri, E.H., Mantle Shear-wave Velocity Structure Beneath the Hawaiian Hot Spot. Science, 326, 1388-1390, 2009. Reprint upon request to glaske@ucsd.edu   paper at Science

Laske, G., Collins, J.A., Wolfe, C.J., Solomon, S.C., Detrick, R.S., Orcutt, J.A., Bercovici, D. and Hauri, E.H., 2009. Probing The Hawaiian Hot Spot With New Ocean Bottom Instruments, EOS Trans. AGU, 90, 362-363. complete pdf (incl. supplement)   paper at EOS

Weber, M. and the DESERT Working Group (68 authors), Anatomy of the Dead Sea Transform from Lithospheric to Microscopic Scale. Rev. Geophys., 47, RG2002, 2009. Reprint upon request to glaske@ucsd.edu paper at RG   corrigendum

Grad, M., Tiira, T. and ESC Working Group (62 authors), The Moho depth map of the European Plate, Geophys. J. Int., 176, 279-292, 2009. Reprint upon request to glaske@ucsd.edu   paper at GJI

2008 and prior

Houser, C., Masters, G., Shearer, P. and Laske, G., Shear and compressional velocity models of the mantle from cluster analysis of long-period waveforms. Geophys. J. Int., 174, 195-212, 2008. Reprint upon request to glaske@ucsd.edu   paper at GJI

Laske, G., Weber, M. and the DESERT Working Group, Lithosphere Structure Across the Dead Sea Transform as Constrained by Rayleigh Waves Observed During the DESERT Experiment. Geophys. J. Int., 173, 593-610, 2008. pdf   paper at GJI

Laske, G., Phipps Morgan, J. and Orcutt, J.A., The Hawaiian SWELL Pilot Experiment - Evidence for Lithosphere Rejuvenation from OCean Bottom Surface Wave Data. GSA Special Paper 430, doi: 10.1130/2007.2430(11), 2007.   pdf preprint
NB: the GSA reprint available at GSA does not include the supplements that are available online at GSA.

Laske, G. and Widmer-Schnidrig, R., Normal Mode & Surface Wave Observations. in: "Treatise on Geophysics, Volume 1: Seismology and Structure of the Earth", Vol. 1, 67-125, 2007. pdf preprint
NB: author order in the print version/book is reverse and wrong.

Zhou, Y., Nolet, G., Dahlen, F.A. and Laske, G., Global upper mantle structure from finite-frequency surface-wave tomography. J. Geophys. Res., 111, B04304, doi:10.1029/2005/JB003677, 2006. Reprint upon request to glaske@ucsd.edu   paper at JGR

Zhou, Y., Dahlen, F.A., Nolet, G. and Laske, G., Finite-frequency effects in global surface-wave tomography. Geophys. J. Int., 163, 1087-1111, 2005. Reprint upon request to glaske@ucsd.edu   paper at GJI

Park, J., Song, T.A., Tromp, J., Okal, E., Stein, S., Roult, G., Clevede, E., Laske, G., Kanamori, H., Davis, P., Berger, J., Braitenberg, C., Vam Camp, M., Lei, X., Sun, H., Xu, H. and Rosat, S. Earth's Free Oscillations Excited by the 26 December 2004 Sumatra-Andaman Earthquake. Science, 308, 1139-1144, 2005. pdf   paper at Science

Butler, R., Lay, T., Creager, K., Earle, P., Fischer, K., Gaherty, J., Laske, G., Leith, B., Park, J., Ritzwoller, M., Tromp, J. and Wen, L., The Global Seismographic Network Surpasses Its Design Goal. EOS Trans. AGU, 85, 225-229, 2004. pdf   paper at EOS

Laske, G. and Masters, G., The Earth's Free Oscillations and the Differential Rotation of the Inner Core. AGU Geodynamics series, "Earth's Core; Dynamics, Structure, Rotation", Vol. 31, 5-21, 2003. pdf preprint   Reprint upon request to glaske@ucsd.edu

Cotte, N. and Laske, G., Testing group velocity maps for Eurasia Geophys. J. Int., 150, 639-650, 2002. glaske@ucsd.edu   paper at GJI

Laske, G. and Cotte, N., Surface Wave Waveform Anomalies at the Saudi Seismic Network, Geophys. Res. Let., 28, 4383-4386, 2001. pdf   paper at GRL

Masters, G., Laske, G. and Gilbert, F., Large-scale Earth Structure from Analyses of Free-Oscillation Splitting and Coupling, In: E. Boschi, G. Ekstroem and A. Morelli (eds.) "Problems in Geophysics for the New Millenium", Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy, 255-288, 2000.
pdf preprint of appendix

Masters, G., Laske, G. and Gilbert, F., Matrix autoregressive analysis of free-oscillation coupling and splitting. Geophys. J. Int. (Knopoff Festschrift), 143, 478-489, 2000. pdf   pdf at GJI

Zürn, W., Laske, G., Widmer-Schnidrig, R. and Gilbert, F., Observation of Coriolis coupled modes below 1 mHz, Geophys. J. Int., 143, 113-118, 2000. pdf   paper at GJI

Masters, G., Laske, G. and F. Gilbert, Autoregressive Estimation of the Splitting Matrix of Free-Oscillation Multiplets. Geophys. J. Int., 141, 25-42, 2000. pdf   pdf at GJI

Masters, G., Laske, G. Bolton, H. and A. Dziewonski, The relative behavior of shear velocity, bulk sound speed, and compressional velocity in the mantle: implications for chemical and thermal structure. AGU Monograph series, "Seismology and Mineral Physics", Vol. 117, 63-87, 2000. pdf.

Laske, G. and G. Masters, Limits on differential rotation of the inner core from an analysis of the Earth's free oscillations. Nature, 402, 66-68, 1999. pdf   paper at Nature

Laske, G., Phipps Morgan J. and J.A. Orcutt, First results from the Hawaiian SWELL Pilot Experiment. Geophys. Res. Let., 26, 3397-3400, 1999. pdf   paper at GRL

Laske, G. and G. Masters, Surface wave polarization data and global anisotropic structure. Geophys. J. Int., 132, 508-520, 1998. pdf   pdf at GJI

Mooney, W.D., G. Laske and G. Masters, CRUST 5.1: A global crustal model at 5 x 5 degrees. J. Geophys. Res., 103, 727-747, 1998.
Reprint upon request to glaske@ucsd.edu   paper at JGR

Laske, G. and G. Masters, Constraints on global phase velocity maps by long-period polarization data. J. Geophys. Res., 101, 16,059-16,075, 1996.
Reprint upon request to glaske@ucsd.edu   paper at JGR

Masters, G., S. Johnson, G. Laske and H. Bolton, A shear-velocity model of the mantle. Phil. Trans. R. Soc. London A, 354, 1285-1411, 1996.   paper at PhilTrans

Laske, G., Global observation of off-great circle propagation of long-period surface waves. Geophys. J. Int., 123, 245-259, 1995. pdf   pdf at GJI

Laske G., G. Masters and W. Zürn, Frequency-dependent polarization measurements of long period surface waves and their implications for global phase velocity maps. Phys. Earth Planet. Int., 84, 111-137, 1994. pdf   paper at PEPI

Laske G., Frequency-dependent polarization measurements of long period surface waves and their implications for global phase velocity maps. Doctoral Thesis, Universität Karlsruhe, Germany, 1993.

Zürn W., H.-G. Wenzel and G. Laske, High quality data drom LaCoste-Romberg gravimeters with electrostatic feedback: A challenge for superconducting gravimeters. Bull. d'Informations Marees Terrestres, 110, 7940-7952, 1991.

Koptschalitsch, G., Die Anwendung der zeitvariablen Filterung bei der Eigenschwingungsanalyse, Diploma Thesis, Universität Karlsruhe, Germany, 1987.

Mechie, J., C. Prodehl and G. Koptschalitsch, Ray path interpretation of the crustal structure beneath Saudi Arabia. Tectonophysics, 131, 333-352, 1986. paper at Tectonophysics

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Directions to IGPP:

 Show me the MAP.

From I5 (southbound), go west on La Jolla Village Dr., ~1.25 Miles left on La Jolla Shores Dr., in ~.75 miles, near the bottom of the hill the road makes a sharp left turn. Just after this bend turn Right onto Biological Grade (watch for bikers!). This road makes a sharp left in about 100 yards follow it through a parking lot etc. until you come to parking lot P10.

From I5 (northbound), go west on La Jolla Parkway, down the hill. Turn right at second traffic light (Hotel La Jolla on the right). Continue for ~1.5 Miles. You will pass the IGPP bridge. After that bridge, turn left onto Biological Grade. From there, see above.

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