scholarly journals Seismotectonics of the Horseshoe Abyssal Plain and Gorringe Bank, eastern Atlantic Ocean: Constraints from ocean bottom seismometer data

2017 ◽  
Vol 122 (1) ◽  
pp. 63-78 ◽  
Author(s):  
Ingo Grevemeyer ◽  
Dietrich Lange ◽  
Heinrich Villinger ◽  
Susana Custódio ◽  
Luis Matias
Keyword(s):  
Atlantic Ocean ◽  
Abyssal Plain ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Eastern Atlantic Ocean ◽  
Gorringe Bank

Discovery of Late Jurassic fossils inside modern sediments at Gorringe Bank (Eastern Atlantic Ocean) and some geological implications.

Terra Nova ◽  
2004 ◽  
Vol 16 (6) ◽  
pp. 331-337 ◽  
Author(s):  
Maria Alessandra Conti ◽  
Giovanni de Alteriis ◽  
Maria Concetta Marino ◽  
Giovanni Pallini ◽  
Renato Tonielli
Keyword(s):  
Atlantic Ocean ◽  
Late Jurassic ◽  
Eastern Atlantic Ocean ◽  
Geological Implications ◽  
Gorringe Bank

A Hemisessile Sea Anemone from the Porcupine Abyssal Plain, North Atlantic Ocean: Iosactis Vagabunda gen. nov., sp. nov.

1997 ◽  
Vol 77 (4) ◽  
pp. 1011-1025 ◽  
Author(s):  
Karin Riemann-Zürneck
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic Ocean ◽  
Benthic Fauna ◽  
Time Lapse ◽  
Abundant Species ◽  
Sea Anemone ◽  
Abyssal Plain ◽  
The North ◽  
New Family ◽  
Eastern Atlantic Ocean

The Porcupine Abyssal Plain in the north-eastern Atlantic Ocean is subject to periodical deposition of phytodetritus and has a highly diverse benthic fauna dependent on this source of organic matter. Among the most abundant species from the northern study site of the Institute of Oceanographic Sciences Deacon Laboratory (IOSDL) at ~48°50′N 16°30′W, 4850 m, is Iosactis vagabunda gen. nov., sp. nov. (Cnidaria: Actiniaria, Iosactiidae fam. nov.), a small endomyarian sea anemone. The fact that this species is a burrower, with a smooth, unspecialized column, and a rounded aboral end provided with a central pit, makes it stand out from the other families of endomyarian anemones and prompted the establishment of the new family Iosactiidae. There is evidence that the closest relatives of the new family are the ‘deep water actiniids’ (e.g. Bolocera, Liponema, Leipsiceras), and the Andresiidae. Long-term in situ time-lapse photographs indicate a unique behaviour of this anemone in that it moves out of its hole at times, presumably exhibiting a hemisessile lifestyle in this peculiar abyssal habitat.

scholarly journals Mercury in North-Eastern Atlantic Ocean Water

Nature ◽  
1971 ◽  
Vol 232 (5306) ◽  
pp. 112-112 ◽  
Author(s):  
T. M. LEATHERLAND ◽  
J. D. BURTON ◽  
M. J. MCCARTNEY ◽  
F. CULKIN
Keyword(s):  
Atlantic Ocean ◽  
Ocean Water ◽  
Eastern Atlantic Ocean ◽  
North Eastern

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.

An ocean-bottom seismometer capsule

1974 ◽  
Vol 64 (4) ◽  
pp. 1251-1262
Author(s):  
William A. Prothero
Keyword(s):  
Seismic Event ◽  
Field Tests ◽  
Data Interpretation ◽  
Seismic Signal ◽  
Digital Data ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Event Trigger ◽  
Analog Output ◽  
Predetermined Time

abstract An ocean-bottom seismometer capsule containing a 1-Hz vertical seismometer and triggered digital recording system has been developed and tested off the coast of San Diego. The output of the seismometer is continuously digitized at 64, 128, or 256 samples per second. The digital data is mixed with a time code and passed through a 256 sample shift register which acts as a delay line. It is then mixed with synchronization characters, serialized, encoded, and recorded on a SONY TC800B tape recorder which is turned on when a seismic event occurs. The event trigger occurs when the seismic signal jumps to at least twice the time-averaged input signal. Data are recovered using the same recorder for playback and a decoder which provides an analog output for field data interpretation or a digital output for computer analysis. The capsule itself falls freely to the ocean bottom. After a predetermined time it is released from a 150-lb steel tripod and floats to the surface. A dual timer and explosive bolt system provides a high recovery reliability. A number of seismic events have been measured in field tests and the system has proven to be extremely simple to check out, diagnose, and deploy.

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