UCSC Costa Rica Seismogenic Zone project public archive

(includes station information for Costa Rica seismic networks through 2005)

  *click on illustration for a larger view
Shown are Nicoya-CRSEIZE earthquakes (red squares), the Nicoya seismic deployment (yellow triangles), and high resolution bathymetry and topography (Ranero et al., Nature 2003; GTOPO30). Seismicity shown in this image are similar to the high resolution, low error (1 sigma vert and horiz. < 0.5 km ) results from Newman et al.(2002).

*click on illustration for a larger view
Shown are the highest quality Osa-CRSEIZE relocated aftershocks (red circles)of the 1999 Quepos earthquake (yellow star).  The Osa seismic deployment (blue triangles), regions of concentrated mainshock moment release (star and square marked 2 respectively from Bilek et al. 2003), and high resolution bathymetry and topography (Ranero et al., Nature 2003) also shown. DeShon et al. [2003] report relocations of local seismicity (grey circles) and well-constrained (GAP≤180º, ≥10 P&S-wave arrivals) aftershocks (red circles) .

Shown are high-resolution Nicoya-CRSEIZE earthquakes (red circles), the Nicoya seismic deployment (triangles), and previously published refraction and reflection data (blue lines; Christeson et al. 1999; Sallares et al., 1999, 2001; Ye et al., 1996).   Simultaneous inversion of P and S-P times from 611 small magnitude earthquakes yielded hypocenters, a 3D P-wave velocity model, and a 3D compressional/shear velocity (Vp/Vs) model.  We used the program SIMULPS13Q for this study.  Velocity models are available by requesst.

        Waveforms for all land stations are currently available through the IRIS DMC http://www.iris.edu/about/DMC/
        OBS waveforms available upon request through L.Dorman http://www-mpl.ucsd.edu/cg/people/ldorman.html

    • Newman, A.V., S.Y. Schwartz, V. Gonzalez, H.R. DeShon, J.M. Protti, and L.M. Dorman (2002), Along-strike variability in the seismogenic zone below Nicoya Peninsula, Costa Rica, Geophysical Research Letters, 29, 1977, doi: 10.1029/2002GL015409. Download PDF version
    • DeShon, H.R., S.Y. Schwartz, S.L. Bilek, L.M. Dorman, V. Gonzalez, J.M. Protti, E.R. Flueh, and T.H. Dixon (2003), Seismogenic zone structure of the southern Middle America Trench, Costa Rica, J. of Geophysical Research, 108, doi:10.1029/2002JB002294  Download PDF version
    • DeShon, H.R., S.Y. Schwartz, A.V. Newman, V. Gonzalez, J.M. Protti, L.M. Dorman, T. Dixon, E. Norabuena and E. Flueh (2006), Seismogenic zone structure beneath the Nicoya Peninsula, Costa Rica, from 3D local earthquake P- and S-wave tomography, Geophysical J. International, 164, 109-124, doi:10.1111/j.1365-246X.2005.02809.x. Download PDF version (14.2 MB)
    • Schwartz, S.Y. and H.R. DeShon (2007), Evidence for multiple mechanical transitions along the updip limit, Nicoya Peninsula, Costa Rica, in The Seismogenic Zone of Subduction Thrust Faults, eds. T. Dixon and J.C. Moore, Columbia University Press, New York, (in press).
    • Hansen, S.E., S.Y. Schwartz, and H.R. DeShon (2006), Earthquake relocation and focal mechanism determination using waveform cross-correlation, Nicoya Peninsula, Costa Rica, Bull. Seismological Society America, 96 (3): 1003-1011. Download PDF version
    • Brown, K.M., M. Tryon, H.R. DeShon, L.M. Dorman, and S.Y. Schwartz (2005), Transient fluid pulsing and seismic tremor: Evidence of episodic creep at the updip edge of the seismogenic zone, Costa Rica? Earth Planetary Science Letters, 238, 189-203. Download PDF
    • <>DeShon, H.R., and S.Y. Schwartz (2004), Evidence for serpentinization of the forearc mantle wedge along the Nicoya Peninsula, Costa Rica, Geophysical Research Letters, 31, L21611, doi:10.1029/2004GL021179. PDF available by request
    • Norabuena, E., T.H. Dixon, S.Y. Schwartz, H.R. DeShon, M. Protti, L. Dorman, E.R. Flueh, P. Lundgren, A. Newman, F. Pollitz, D. Sampson (2004), Geodetic and seismic constraints on seismogenic zone processes in Costa Rica, J. of Geophysical Research, 109, B11403, doi:10.1029/2003JB002931. PDF available by request

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    Recent seismic arrays
           in Costa Rica

    Observatorio Vulcanologico y Sismologico de Costa Rica
    Universidad Nacional, Heredia, Costa Rica

    Red Sismologica Nacional (ICE/UCR)
    Instituto Costarricense de Electricidad &
    Universidad de Costa Rica, San Jose, Costa Rica

    GEOMAR/Christian-Albrechts Univ. of Kiel
    Kiel, Germany

    Zurich, Switzerland
    • Merged OVSICORI & RSN arrival information 
      • available for 1/1985 - 8/1998
      • contact Stephan Husen for further info

    Network uptimes in Costa Rica.  Recent > 6.0 magnitude earthquakes offshore Costa Rica are indicated in red.  Quepos mainshock refers to the 20 August 1999 Mw 6.9 underthrusting event offshore Quepos (central CR), Nicoya outer rise mainshock refers to the 21 July 2000 normal faulting event offshore the Nicoya Peninsula, and Osa mainshock to the 16 June, 2002 6.4 underthrusting event northwest of the Osa Peninsula
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    Questions? Please contact Heather DeShon hdeshon@geology.wisc.edu
    Updated June 8 10:39 CST 2006