scholarly journals A 2-D tomographic model of the Juan de Fuca plate from accretion at axial seamount to subduction at the Cascadia margin from an active source ocean bottom seismometer survey

2016 ◽  
Vol 121 (8) ◽  
pp. 5859-5879 ◽  
Author(s):  
G. Horning ◽  
J. P. Canales ◽  
S. M. Carbotte ◽  
S. Han ◽  
H. Carton ◽  
...  
Keyword(s):  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Juan De Fuca Plate ◽  
Active Source ◽  
Cascadia Margin ◽  
Juan De Fuca ◽  
Axial Seamount

The Alaska Amphibious Community Seismic Experiment

2020 ◽  
Vol 91 (6) ◽  
pp. 3054-3063 ◽  
Author(s):  
Grace Barcheck ◽  
Geoffrey A. Abers ◽  
Aubreya N. Adams ◽  
Anne Bécel ◽  
John Collins ◽  
...  
Keyword(s):  
Strong Motion ◽  
Seismic Survey ◽  
Absolute Pressure ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Alaska Peninsula ◽  
Outer Rise ◽  
Kodiak Island ◽  
Active Source ◽  
Seismic Experiment

Abstract The Alaska Amphibious Community Seismic Experiment (AACSE) is a shoreline-crossing passive- and active-source seismic experiment that took place from May 2018 through August 2019 along an ∼700  km long section of the Aleutian subduction zone spanning Kodiak Island and the Alaska Peninsula. The experiment featured 105 broadband seismometers; 30 were deployed onshore, and 75 were deployed offshore in Ocean Bottom Seismometer (OBS) packages. Additional strong-motion instruments were also deployed at six onshore seismic sites. Offshore OBS stretched from the outer rise across the trench to the shelf. OBSs in shallow water (<262  m depth) were deployed with a trawl-resistant shield, and deeper OBSs were unshielded. Additionally, a number of OBS-mounted strong-motion instruments, differential and absolute pressure gauges, hydrophones, and temperature and salinity sensors were deployed. OBSs were deployed on two cruises of the R/V Sikuliaq in May and July 2018 and retrieved on two cruises aboard the R/V Sikuliaq and R/V Langseth in August–September 2019. A complementary 398-instrument nodal seismometer array was deployed on Kodiak Island for four weeks in May–June 2019, and an active-source seismic survey on the R/V Langseth was arranged in June 2019 to shoot into the AACSE broadband network and the nodes. Additional underway data from cruises include seafloor bathymetry and sub-bottom profiles, with extra data collected near the rupture zone of the 2018 Mw 7.9 offshore-Kodiak earthquake. The AACSE network was deployed simultaneously with the EarthScope Transportable Array (TA) in Alaska, effectively densifying and extending the TA offshore in the region of the Alaska Peninsula. AACSE is a community experiment, and all data were made available publicly as soon as feasible in appropriate repositories.

PETROLOGY AND PETROGENESIS OF ANDESITES FROM AXIAL SEAMOUNT, JUAN DE FUCA RIDGE

2017 ◽  
Author(s):  
Sara Renea Mills ◽  
◽  
Micheal Perfit ◽  
David A. Clague ◽  
Jennifer Brophy Paduan
Keyword(s):  
Juan De Fuca Ridge ◽  
Fuca Ridge ◽  
Juan De Fuca ◽  
Axial Seamount

The northern limit of the subducted Juan de Fuca Plate system

1998 ◽  
Vol 103 (B11) ◽  
pp. 26949-26961 ◽  
Author(s):  
John F. Cassidy ◽  
Robert M. Ellis ◽  
Costas Karavas ◽  
Garry C. Rogers
Keyword(s):  
Northern Limit ◽  
Juan De Fuca Plate ◽  
Juan De Fuca ◽  
Plate System

Comparison of the S/N ratios of low-frequency hydrophones and geophones as a function of ocean depth

1981 ◽  
Vol 71 (5) ◽  
pp. 1649-1659
Author(s):  
Thomas M. Brocher ◽  
Brian T. Iwatake ◽  
Joseph F. Gettrust ◽  
George H. Sutton ◽  
L. Neil Frazer
Keyword(s):  
Nova Scotia ◽  
Continental Margin ◽  
Low Frequency ◽  
Weather Conditions ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Scotian Shelf ◽  
Ocean Bottom Seismometers ◽  
Particle Velocities ◽  
Refraction Data

abstract The pressures and particle velocities of sediment-borne signals were recorded over a 9-day period by an array of telemetered ocean-bottom seismometers positioned on the continental margin off Nova Scotia. The telemetered ocean-bottom seismometer packages, which appear to have been very well coupled to the sediments, contained three orthogonal geophones and a hydrophone. The bandwidth of all sensors was 1 to 30 Hz. Analysis of the refraction data shows that the vertical geophones have the best S/N ratio for the sediment-borne signals at all recording depths (67, 140, and 1301 m) and nearly all ranges. The S/N ratio increases with increasing sensor depth for equivalent weather conditions. Stoneley and Love waves detected on the Scotian shelf (67-m depth) are efficient modes for the propagation of noise.

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