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| Titel |
Monitoring of gas and seismic energy release: new results from the multi-parametric benthic observatory SN-4 at MARsite location (Gulf of Izmit, Turkey) |
| VerfasserIn |
Davide Embriaco, Giuditta Marinaro, Francesco Frugoni, Stephen Monna, Giuseppe Etiope, Luca Gasperini, Alina Polonia, Fabrizio Del Bianco, M. Namik Çağatay, Umut B. Ulgen, Paolo Favali |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097798
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| Publikation (Nr.) |
 EGU/EGU2014-13412.pdf |
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| Zusammenfassung |
| Episodic gas seepage occurs at the seafloor in the Gulf of Izmit (Sea of Marmara, NW
Turkey) along the submerged segment of the North Anatolian Fault (NAF), which ruptured
during the 1999 Mw7.4 Izmit earthquake, and caused tectonic loading of the fault
segment in front of the Istanbul metropolitan area. Marmara site was selected as
one EMSO (European Multidisciplinary Seafloor and water column Observatory)
node where establish a permanent sea-bottom observatory. An autonomous and
long-term multiparametric benthic observatory (SN-4) was deployed in order to
study gas seepage and seismic energy release along the NAF. SN-4 operated in the
gulf at the western end of the 1999 Izmit earthquake rupture for about one-year at
166 m water depth. The SN-4 payload included a three-component broad-band
seismometer, as well as gas and oceanographic sensors. We analysed data collected
continuously for 161 days in the first part of the experiment, from October 2009 to March
2010. The main objective of our work was to verify whether tectonic deformation
along the NAF could trigger methane seepage. Results from the SN-4 experiment
in the Sea of Marmara suggest that neither low-magnitude local seismicity, nor
regional events affect intensity and frequency of gas flows from the seafloor. The
SN-4 observatory was recently re-deployed in the same site for another one year
mission (September 2013) in the framework of MARsite (New Directions in Seismic
Hazard assessment through Focused Earth Observation in the Marmara Supersite)
EC project which aims assessing the “state of the art” of seismic risk evaluation
and management at European level by long-term monitoring activities in Marmara
Sea.
References
EMSO web site: http://www.emso-eu.org
MARsite web site: http://www.marsite.eu/ |
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