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Arctic megaslide at presumed rest
Wolfram H Geissler1, A Catalina Gebhardt1, Felix Gross2
1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
Arctic slopes show signs of instability, with evidence of past failures and active gas reservoirs. Further study is needed to determine if the area is preconditioned for future large-scale geohazards.
Area of Science:
- Geology
- Geophysics
- Arctic Science
Background:
- Slope failures are significant geohazards in the Arctic.
- The Hinlopen/Yermak Megaslide is a major past event.
Purpose of the Study:
- Analyze hydroacoustic and seismic data for signs of instability.
- Investigate past and potential future slope failures.
- Understand the role of gas hydrates and fluids in slope stability.
Main Methods:
- 2D high-resolution seismic data acquisition and analysis.
- Hydroacoustic data interpretation.
- Bathymetric data analysis.
Main Results:
- Evidence of incipient slope instability found.
- Minor slide deposits and internally-deformed layers indicate past incomplete failure.
- Active gas reservoir at the base of the gas hydrate stability zone identified.
- Widespread methane seepage detected on adjacent shelves.
Conclusions:
- Over-pressured fluids likely played a role in past slope failures.
- The current state of the studied slope (fully preconditioned or slowly deforming) remains uncertain.
- Further monitoring is crucial for assessing future geohazard risks.
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