Publication Date:
2024-05-09
Description:
After the 1999 Ìzmit earthquake (Mw7.4), along the North-Anatolian Fault (NAF), an
increase in gas emissions from the seafloor of the Sea of Marmara was observed.
Using a multidisciplinary approach, that includes a combined analysis of high-resolution marine geophysical and gas-geochemical data, we determined the character of gas/fluid emissions and their spatial relationship with tectonic structures in the Darıca Basin (Gulf of Ìzmit), close to the western termination of the 1999 earthquake surface rupture. Data collected during several oceanographic expeditions allowed us to investigate
the fine structure of active fault branches, as well as the geochemical signature of the cold seeps. We observed that gas emissions at the seafloor of the Darıca Basin are mostly constituted by biogenic CH4, and are aligned along strike-slip and transtensional
fault segments. Although maximum CH4 concentrations were measured in correspondence of transtensional strands, we suggest that the biogenic CH4 emissions
found along strike-slip segments, showing a relatively low gas background noise and a potential to increase during seismic events, are more suitable to study relationships
between gas expulsion and the earthquake cycle.
Description:
Published
Description:
371-384
Description:
4.5. Studi sul degassamento naturale e sui gas petroliferi
Description:
JCR Journal
Description:
restricted
Keywords:
cold seeps
;
earthquake cycle
;
Ìzmit earthquake
;
Gulf of Ìzmit
;
North Anatolian Fault (NAF)
;
Sea of Marmara
;
seafloor observatories
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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