Research output: Contribution to journal › Article › peer-review
Ground-truthing 11-to 12-kHz side-scan sonar imagery in the Norwegian-Greenland Sea : Part I: Pockmarks on the Vestnesa Ridge and Storegga slide margin. / Vogt, PR; Gardner, J; Crane, K; Sundvor, E; Bowles, F; Cherkashev, G.
In: Geo-Marine Letters, Vol. 19, No. 1-2, 09.1999, p. 97-110.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Ground-truthing 11-to 12-kHz side-scan sonar imagery in the Norwegian-Greenland Sea
T2 - Part I: Pockmarks on the Vestnesa Ridge and Storegga slide margin
AU - Vogt, PR
AU - Gardner, J
AU - Crane, K
AU - Sundvor, E
AU - Bowles, F
AU - Cherkashev, G
PY - 1999/9
Y1 - 1999/9
N2 - Numerous small (50- to 300-m-diameter) strong-backscatter objects were imaged on the 1200- to 1350-m deep crest of Vestnesa Ridge (Fram Strait) and along the 900- to 1000-m deep northeast margin of the Storegga slide valley. Ground-truthing identified most of these objects;Is 2- to 10-m-deep pockmarks, developed within soft, acoustically stratified silty clays (typical wet bulk density: 1400-1600 kg m(-3); sound speed: 1480-1505 ms(-1); porosity, 65-75%; shear strength: 5-10 kPa; water content: 80-120%; and thermal conductivity: 0.8-0.9 W m(-1) deg C-1 in the top 3 m). Gas wipeouts, enhanced reflectors, and reflector discontinuities indicate recent or ongoing activity, but the absence of local heat flow anomalies suggests that any upward fluid flows are modest and/or local.
AB - Numerous small (50- to 300-m-diameter) strong-backscatter objects were imaged on the 1200- to 1350-m deep crest of Vestnesa Ridge (Fram Strait) and along the 900- to 1000-m deep northeast margin of the Storegga slide valley. Ground-truthing identified most of these objects;Is 2- to 10-m-deep pockmarks, developed within soft, acoustically stratified silty clays (typical wet bulk density: 1400-1600 kg m(-3); sound speed: 1480-1505 ms(-1); porosity, 65-75%; shear strength: 5-10 kPa; water content: 80-120%; and thermal conductivity: 0.8-0.9 W m(-1) deg C-1 in the top 3 m). Gas wipeouts, enhanced reflectors, and reflector discontinuities indicate recent or ongoing activity, but the absence of local heat flow anomalies suggests that any upward fluid flows are modest and/or local.
KW - FRAM STRAIT
KW - SEDIMENTATION
U2 - 10.1007/s003670050098
DO - 10.1007/s003670050098
M3 - статья
VL - 19
SP - 97
EP - 110
JO - Geo-Marine Letters
JF - Geo-Marine Letters
SN - 0276-0460
IS - 1-2
ER -
ID: 35934319