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  • 1
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    Coordinating OBS Parks in Europe (2012)
    Copernicus Publications (EGU)
    In:  [Talk] In: EGU General Assembly 2012, 22.04.-27.04.2012, Vienna, Austria . Geophysicas Research Abstracts .
    Details
    Publication Date: 2012-12-27
    Description: Within Europe there are more than 380 Ocean Bottom Seismometers (OBS) distributed across 10 instrument parks in 6 countries. At least 120 of these OBS are wideband or broadband, over 260 can be deployed for at least 6 months at a time and 140 for at least one year. New parks are planned in two other European countries, which should add over 70 OBSs to this “fleet”. However, these parks are under the control of individual countries or universities and hence to date this has made it difficult to organize large-scale experiments, especially for seismologists without marine experience. There has recently been an initiative to coordinate the use of these distributed instruments and their data products, to encourage large-scale experiments, possibly with onshore and offshore components, by seismologists who have not necessarily used OBSs before. The ongoing or planned developments include: Helping scientists with marine-specific formalities such as ship requests; clearer explanations of the noise floors of OBS instrumentation; improved clarity of instrument pricing and availability; standardized data output formats and data validation; and archiving in established seismological data centers. These efforts should allow improved experiment design in scientifically interesting regions with an offshore component and an easier, clearer way to organize large-scale, multi-country experiments. We will present details of this initiative to help organize large-scale experiments, the particularities of OBS sensors and marine deployments, the available instrumentation and new developments.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 2
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    Ocean bottom seismics (2011)
    Springer
    In:  In: Encyclopedia of Solid Earth Geophysics, Vol. 1-2. , ed. by Gupta, H. K. Encyclopedia of Earth Sciences Series . Springer, Heidelberg, Germany, pp. 901-918. 1. ed. ISBN 978-90-481-8701-0
    Details
    Publication Date: 2020-08-03
    Type: Book chapter , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Book chapter
  • 3
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    The seismogenic zone in the Central Costa Rican Pacific margin: high-quality hypocenters from an amphibious network (2014)
    Springer
    In:  International Journal of Earth Sciences, 103 (7). pp. 1747-1764.
    Details
    Publication Date: 2017-05-23
    Description: Transition from subduction of normal to thickened oceanic crust occurs in the central portion of the Costa Rican margin, where large interplate earthquakes (M * 7) and abundant interseismic seismicity have been associated with subduction of bathymetric highs. We relocated *1,300 earthquakes recorded for 6 months by a combined on- and offshore seismological network using probabilistic earthquake relocation in a 3D P-wave velocity model. Most of the seismicity originated at the seismogenic zone of the plate boundary, appearing as an 18° dipping, planar cluster from 15 to 25–30 km depth, beneath the continental shelf. Several reverse focal mechanisms were resolved within the cluster. The upper limit of this interseismic interplate seismicity seems to be controlled primarily by the overlying-plate thickness and coherency, which in turn is governed by the erosional processes and fluid release and escape at temperatures lower than *100 to 120° C along the plate boundary. The downdip limit of the stick–slip behaviour collocates with relative low temperatures of *150 to 200° C, suggesting that it is controlled by serpentinization of the mantle wedge. The distribution of the interseismic interplate seismicity is locally modified by the presence of subducted seamounts at different depths. Unlike in northern Costa Rica, rupture of large earthquakes in the last two decades seems to coincide with the area defined by the interseismic interplate seismicity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00531-013-0955-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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