2012 IRIS Workshop

3D Double Difference Velocity Tomography of Costa Rica and Nicaragua

Melissa M. Moore-Driskell:University of Memphis, Heather R. DeShon: University of Memphis, Wolfgang Rabbel:Christian-Albrechts-University, Martin Thorwart: Christian-Albrechts-University, Yvonne Dzier:

The Nicaragua/Costa Rica segment of the Middle America subduction zone exhibits seismogenic zone characteristics that are strongly dependent on plate structure, temperature, and fluid-related processes. We use the double difference local earthquake tomography approach tomoDD. Results show improved hypocentral locations of seismogenic zone earthquakes and compressional and shear velocity structure of the seismogenic zone extending approximately 400 km along strike from Nicaragua through central Costa Rica.

Full-resolution graphics file in original format: 0078.ai

Acknoweldgements: We would like to gratefully acknowledge the faculty, staff, and students of University of California-Santa Cruz, the Observatorio Vulcanologico y Sismologico de Costa Rica, and Scripps Institution of Oceanography for their work collecting the CRSEIZE data, and the work of faculty, students and staff of Christian Albrechts University of Kiel and GEOMAR who operated the SFB experiments. The acquisition and initial processing of the data from the JAC, QUE, and NICAT arrays were sponsored by the German Science Foundation (DFG) within the Collaborative Research Program SFB 574. Thanks to the Geophysical Instrument Pool Potsdam (GIPP) at Geoforschungszentrum Potsdam for providing the land seismometers for the JAC, QUE and NICAT arrays and IFM_GEOMAR for the OBS stations. We thank Haijiang Zhang for providing the programs for the Wavelet-AIC picker and tomoDD. We also thank M. Protti, V. Gonzalez, S.Y. Schwartz, S.L. Bilek, A.V. Newman, A. Ghosh, G.T. Farmer, A.M. Thomas, M. Avants, and C.

Keywords: tomography, subduction

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