TY  - JOUR
A1  - Overduin, Pier Paul
A1  - Haberland, Christian
A1  - Ryberg, Trond
A1  - Kneier, Fabian
A1  - Jacobi, Tim
A1  - Grigoriev, Mikhail N.
A1  - Ohrnberger, Matthias
T1  - Submarine permafrost depth from ambient seismic noise
JF  - Geophysical research letters
N2  - Permafrost inundated since the last glacial maximum is degrading, potentially releasing trapped or stabilized greenhouse gases, but few observations of the depth of ice-bonded permafrost (IBP) below the seafloor exist for most of the arctic continental shelf. We use spectral ratios of the ambient vibration seismic wavefield, together with estimated shear wave velocity from the dispersion curves of surface waves, for estimating the thickness of the sediment overlying the IBP. Peaks in spectral ratios modeled for three-layered 1-D systems correspond with varying thickness of the unfrozen sediment. Seismic receivers were deployed on the seabed around Muostakh Island in the central Laptev Sea, Siberia. We derive depths of the IBP between 3.7 and 20.7m15%, increasing with distance from the shoreline. Correspondence between expected permafrost distribution, modeled response, and observational data suggests that the method is promising for the determination of the thickness of unfrozen sediment.
KW  - submarine permafrost
KW  - ambient noise
KW  - Siberia
KW  - continental shelf
Y1  - 2015
U6  - https://doi.org/10.1002/2015GL065409
SN  - 0094-8276
SN  - 1944-8007
VL  - 42
IS  - 18
SP  - 7581
EP  - 7588
PB  - American Geophysical Union
CY  - Washington
ER  -