skip to main content

DOE PAGESDOE PAGES

Title: Sediment gravity flows triggered by remotely generated earthquake waves

Recent great earthquakes and tsunamis around the world have heightened awareness of the inevitability of similar events occurring within the Cascadia Subduction Zone of the Pacific Northwest. We analyzed seafloor temperature, pressure, and seismic signals, and video stills of sediment–enveloped instruments recorded during the 2011–2015 Cascadia Initiative experiment, and seafloor morphology. Our results led us to suggest that thick accretionary prism sediments amplified and extended seismic wave durations from the 11 April 2012 Mw8.6 Indian Ocean earthquake, located more than 13,500 km away. These waves triggered a sequence of small slope failures on the Cascadia margin that led to sediment gravity flows culminating in turbidity currents. Previous studies have related the triggering of sediment–laden gravity flows and turbidite deposition to local earthquakes, but this is the first study in which the originating seismic event is extremely distant (> 10,000 km). The possibility of remotely triggered slope failures that generate sediment–laden gravity flows should be considered in inferences of recurrence intervals of past great Cascadia earthquakes from turbidite sequences. In conclusion, future similar studies may provide new understanding of submarine slope failures and turbidity currents and the hazards they pose to seafloor infrastructure and tsunami generation in regions both with andmore » without local earthquakes.« less
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [1] ; ORCiD logo [1]
  1. Univ. of Washington, Seattle, WA (United States)
  2. U.S. Geological Survey, Seattle, WA (United States); Univ. of Washington, Seattle, WA (United States)
Publication Date:
Grant/Contract Number:
FE0013998; 1339635
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 122; Journal Issue: 6; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Research Org:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; turbidites; earthquakes
OSTI Identifier:
1474278
Alternate Identifier(s):
OSTI ID: 1402347

Johnson, H. Paul, Gomberg, Joan S., Hautala, Susan L., and Salmi, Marie S.. Sediment gravity flows triggered by remotely generated earthquake waves. United States: N. p., Web. doi:10.1002/2016JB013689.
Johnson, H. Paul, Gomberg, Joan S., Hautala, Susan L., & Salmi, Marie S.. Sediment gravity flows triggered by remotely generated earthquake waves. United States. doi:10.1002/2016JB013689.
Johnson, H. Paul, Gomberg, Joan S., Hautala, Susan L., and Salmi, Marie S.. 2017. "Sediment gravity flows triggered by remotely generated earthquake waves". United States. doi:10.1002/2016JB013689. https://www.osti.gov/servlets/purl/1474278.
@article{osti_1474278,
title = {Sediment gravity flows triggered by remotely generated earthquake waves},
author = {Johnson, H. Paul and Gomberg, Joan S. and Hautala, Susan L. and Salmi, Marie S.},
abstractNote = {Recent great earthquakes and tsunamis around the world have heightened awareness of the inevitability of similar events occurring within the Cascadia Subduction Zone of the Pacific Northwest. We analyzed seafloor temperature, pressure, and seismic signals, and video stills of sediment–enveloped instruments recorded during the 2011–2015 Cascadia Initiative experiment, and seafloor morphology. Our results led us to suggest that thick accretionary prism sediments amplified and extended seismic wave durations from the 11 April 2012 Mw8.6 Indian Ocean earthquake, located more than 13,500 km away. These waves triggered a sequence of small slope failures on the Cascadia margin that led to sediment gravity flows culminating in turbidity currents. Previous studies have related the triggering of sediment–laden gravity flows and turbidite deposition to local earthquakes, but this is the first study in which the originating seismic event is extremely distant (> 10,000 km). The possibility of remotely triggered slope failures that generate sediment–laden gravity flows should be considered in inferences of recurrence intervals of past great Cascadia earthquakes from turbidite sequences. In conclusion, future similar studies may provide new understanding of submarine slope failures and turbidity currents and the hazards they pose to seafloor infrastructure and tsunami generation in regions both with and without local earthquakes.},
doi = {10.1002/2016JB013689},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 122,
place = {United States},
year = {2017},
month = {5}
}