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Gas and seismicity within the Istanbul seismic gap
1Ifremer, Département Ressources Physiques et Ecosystèmes de fond de Mer (REM), Plouzané, F-29280, France. louis.geli@ifremer.fr.
Scientific Reports
|May 3, 2018
Summary
Micro-seismicity in the Sea of Marmara is influenced by gas overpressuring, not just tectonic forces. This finding is crucial for understanding earthquake hazards in the Istanbul seismic gap.
Area of Science:
- Geophysics
- Seismology
- Geology
Background:
- Micro-seismicity is key for earthquake hazard assessment.
- Seismicity in the Sea of Marmara's North Anatolian Fault (NAF) has been studied post-1999 earthquakes.
- Previous interpretations focused solely on tectonic drivers for fault behavior.
Purpose of the Study:
- To investigate the role of hydrocarbon gas sources in micro-seismicity.
- To analyze aftershocks of the July 25, 2011, M 5.1 earthquake in the western Sea of Marmara.
- To understand the mechanical behavior of the Main Marmara Fault (MMF).
Main Methods:
- Analysis of micro-seismic events following a moderate earthquake.
- Correlation of seismic activity with known hydrocarbon gas sources.
- Geological interpretation of fault zones and gas migration pathways.
Main Results:
- A significant portion of aftershocks occurred within a gas-overpressured zone (1.5-5 km depth).
- Pressurized gas migration is expected along the Main Marmara Fault towards surface sediments.
- Gas-related processes are identified as a contributing factor to micro-seismicity.
Conclusions:
- Micro-seismicity in the Istanbul offshore domain requires considering both tectonic and gas-related processes.
- Gas overpressuring influences seismic activity along the Main Marmara Fault.
- A comprehensive interpretation of micro-seismicity necessitates integrating geological and seismic data.
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