A seismic investigation of the influence of upper-mantle structure and dynamics on faulting, extension, and rifting in the Sea of Cortez (Gulf of California), Mexico.
Lamont-Dohert Earth Observatory (LDEO)
Woods Hole Oceanographic Inst (WHOI)
Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE)
15 Ocean-Bottom Seismographs (OBS) were deployed in the southern Gulf of California from the R/V New Horizon in Oct 2005
14 OBS were recovered in Oct 2006.
Hundreds of local, regional, and teleseismic earthquakes were recorded. Analyses are underway, check here for updates.
Deployment of a wide-band OBS in the Gulf of California from the R/V New Horizon in Oct 2005. Seismometer is housed in the green sphere, while recording, power, and communications devices are enclosed in the black cylindrical pressure cases. Instrument sinks to seafloor (1-3 km depth) due to its own weight. After recording for 1 year, the anchor (bottom plate) is released, and instrument returns to surface, driven by buoyancy of glass spheres housed in the yellow cases. Instrumentation was provided by the Scripps Institute of Oceanography's OBS facility, as part of the US National Ocean Bottom Seismograph Instrument Pool (OBSIP).
Promotional flyer -- PDF
Experiment map and status (4/07) -- PDF
Cruise Report, deployment -- PDF (10 Mb)
Cruise Report, recovery -- PDF
Southern Gulf Earthquake catalog -- electronic supplement to Sumy et al., The mechanisms of earthquakes and faulting in the southern Gulf of California, Bull. Seism. Soc. Am., 2012 -- PDF
Long Period noise suppression -- poster presentation -- PDF
Rayleigh Wave velocities from ambient noise correlation -- poster presentation -- PDF (15 Mb)
Underway data and other experiment information is archived in the Marine Geoscience Data System, under the expedition name SCOOBA1NH.
OBS data will be archived in the IRIS Data Management Center and will be openly available in October, 2009.
Funding for this experiment was provided by the US National Science Foundation, through the MARGINS program.
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