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| Titel |
Preliminary results of receiver function analyses at three sites across the Bransfield Strait, Antarctica |
| VerfasserIn |
C. Martínez Arévalo, F. Mancilla, J. Almendros, J. L. Aznarte, G. Alguacil |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250031010
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| Zusammenfassung |
| In February 2008, in the framework of the International Polar Year
2008-2009 under grant POL2006-08663 of the spanish Ministry of Education,
we deployed three broadband seismometers at points forming a N-S profile
across the Bransfield Strait, Antarctica, in the region between the South
Shetland Islands and the Antarctic Peninsula. This region is very
interesting from a tectonic point of view, due to the opening of the rift
of the Bransfield and the presence of the South Shetland microplate. For
logistic reasons, our instruments where located in the vicinity of the
Antarctic bases Juan Carlos I (Livingston Island), Gabriel de Castilla
(Deception Island), and Primavera (Antarctic Peninsula). Each seismic
station consisted of a broad-band, three-component electrolitic
seismometer equiped with a 24-bit data acquisition system. The energy was
provided by wind generators and solar panels connected to a battery bank,
a combination that has been able to provide enough power at all sites,
even during the Antarctic winter. All components were designed to function
under the extreme conditions of the Antarctic weather. The main objective
of this experiment was to use receiver function techniques on teleseism
data to investigate the structure of the crust under the sites, in order
to compare with other studies and shed light on the structure and
tectonics of the region. During this past year, we have recorded several
tens of teleseisms at distances appropriate for receiver function
analyses. Preliminary results will add information on critical issues
regarding the structure of the Bransfield Strait region. Although the
Earth models obtained will contain extra information, we are specially
interested in the determination of the depth of the Moho at each site, a
controversial point in this area. These results will be compared with
estimates obtained by different techniques. We are also interested in the
determination of the vertical extent of the magma chamber recently imaged
by high-resolution seismic tomography under Deception Island volcano. |
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