Results 171 to 180 of about 13,020 (209)
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Facies, 2012
Carbonate sedimentation concurrent with submarine volcanism is very rare in the geologic record but is well displayed in the Early to Middle Miocene Conejo Volcanics of the central Santa Monica Mountains of southern California. Limestone occurs as lenticular deposits on the surface of composite flows units, as matrix within breccia of pebble- to cobble-
Robert J. Stanton, John M. Alderson
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Carbonate sedimentation concurrent with submarine volcanism is very rare in the geologic record but is well displayed in the Early to Middle Miocene Conejo Volcanics of the central Santa Monica Mountains of southern California. Limestone occurs as lenticular deposits on the surface of composite flows units, as matrix within breccia of pebble- to cobble-
Robert J. Stanton, John M. Alderson
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Submarine Volcanism Identification with Neural Networks
Volcanic feature identification on topographic maps is an emerging area that can leverage advanced machine learning techniques. However, the field faces challenges due to the scarcity of current labeled volcanic data, class imbalances, and limitations in existing models.Jialei Qiu +3 more
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Submarine volcanism in the Sicilian Channel revisited
Marine GeologyHighlights • New geophysical data and samples redefine submarine volcanism in Sicilian Channel. • Three dominant bands of volcanism are distinguished. • Ancient, eroded structures aligned at 120° are tied to faulted banks in the north. • Younger band of similarly aligned volcanism in the south is linked to grabens. •
Micallef, Aaron +19 more
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Volcanic events associated with an enigmatic submarine earthquake
Geophysical Journal International, 2000Summary On 1996 September 4, a submarine earthquake occurred underneath the Smith Caldera near Tori-Shima on the Izu-Bonin arc, Japan. Its mechanism was a CLVD with the principal tensile dipole in the vertical direction. The tsunami magnitude Mt of 7.5 was significantly larger than not only the body wave magnitude, mb, of 5.6 but also the moment ...
H. Sugioka +3 more
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A submarine perspective of the Honolulu Volcanics, Oahu
Journal of Volcanology and Geothermal Research, 2006Lavas and volcaniclastic deposits were observed and collected from 4 submarine cones that are part of the Honolulu Volcanics on Oahu, Hawaii. The locations of these and a few additional, but unsampled, vents demonstrate that nearly all the vents are located on or very close to the shoreline of Oahu, with the most distal vent just 12 km offshore.
David A. Clague +5 more
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Active Submarine Volcanism in the Austral Islands
Science, 1970An active submarine volcano has been found on a southeastward extension of the Austral Islands chain. Its last eruption, in May 1967, was detected by North Pacific hydrophones. The position computed by sofar was 32 kilometers northwest of that found in a search by echo sounder, 29°01′S, 140°17′W. The minimum depth encountered was 460 meters.
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Geologic implications of microfossils in submarine volcanics
Bulletin Volcanologique, 1971Samples of basalt and palagonite tuff-breccia dredged from the East Pacific Rise and Eickelberg Ridge in the northeast Pacific contain Foraminifera, diatoms, and other microorganisms associated with sediments. Microfossils are found in large vesicles in the interior of the rock. Palagonite tuff-breccias include sediments containing microfossils.
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Volcanic-Island Lateral Collapses and Their Submarine Deposits
2020Landslide deposits offshore many volcanic islands provide evidence of catastrophic lateral collapses. These deposits span a larger volume range than their continental equivalents, and can generate devastating tsunamis. All historical volcanic-island lateral collapses have occurred in arc settings, and have been characterised by rapid failure and ...
Sebastian F. L. Watt +2 more
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Multi-sensor acoustic evidence of submarine volcanism across diverse tecto-volcanic regimes
2023Submarine volcanism and associated submarine venting can be observed using multibeam bathymetry, seafloor backscatter, water-column backscatter, and sub-bottom acoustic profiling. While numerous volcanically-driven gas accumulation and venting phenomena can be observed through these techniques (such as water-column acoustic flares, subsurface acoustic ...
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