Tectono‐magmatic processes investigated at deep‐water flanks of Hawaiian volcanoes

Naka, Jiro; Takahasi, Eitaro; Clague, David A.; Garcia, M. O.; Hanyu, Takeshi; Herrero‐Bervera, Emilio; Ishibashi, Jun Ichiro; Ishizuka, Osamu; Johnson, K. T. M.; Kanamatsu, Toshiya; Kaneoka, Ichiro; Lipman, Peter W.; Malahoff, Alexander; McMurtry, Gary M.; Midson, Brian; Moore, James G.; Morgan, Julia K.; Naganuma, Takeshi; Nakajima, Katsuji; Oomori, Tamotsu; Pietruszka, A. J.; Satake, Kenji; Sherrod, David R.; Shibata, Tomo; Shinozaki, Ken; Sisson, T. W.; Smith, John R.; Takarada, S.; Thomber, C.; Trusdell, Frank A.; Tsuboyama, Nohiro; Ui, Tadao; Umino, Susumu; Uto, Kozo; Yokose, Hisayoshi

doi:10.1029/00eo00152

Cited by 21 publications

(6 citation statements)

References 5 publications

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“…Such interbedding was also observed at nearby ODP site 1223A (Figures 1 and 6; Stephen, Kasahara, et al, 2003). The limited scatter between the other pelagic velocity profiles may be caused by a lesser degree of volcanic interbedding, which has been found in the uppermost sediments surrounding the Hawaiian islands both on and off the Swell (Naka et al, 2000(Naka et al, , 2002 and has been identified in sediments over 500 km from the islands (Rehm & Halbach, 1982). We assumed linear velocity-depth gradients for both types of sediments, although many studies have found nonlinear concave down velocity-depth relationships (e.g., Hamilton, 1979;Ruan et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Doran

Laske

2019

JGR Solid Earth

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We present models of compressional and shear velocity structure of the oceanic sediments and upper crust surrounding the Hawaiian islands. The models were derived from analysis of seafloor compliance data and measurements of Ps converted phases originating at the sediment‐bedrock interface. These data were estimated from continuous broadband ocean bottom seismometer acceleration and pressure records collected during the Plume‐Lithosphere Undersea Mantle Experiment, an amphibious array of wideband and broadband instruments with an aperture of over 1,000 km. Our images result from a joint inversion of compliance and Ps delay data using a nonlinear inversion scheme whereby deviation from a priori constraints is minimized. In our final model, sediment thickness increases from 50 m at distal sites to over 1.5 km immediately adjacent to the islands. The sedimentary shear velocity profiles exhibit large regional variations. While sedimentary structure accounts for the majority of the compliance signal, we infer variations in shear velocity in the uppermost bedrock on the order of ±5%. We also require relatively high values of Poisson's ratio in the uppermost crust. Lower crustal velocities are generally seen to the north and west of the islands but do not appear well correlated with the Hawaiian Swell bathymetry. A region of strong low velocity anomalies to the northeast of Hawaii may be associated with the Molokai fracture zone.

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Section: Resultsmentioning

confidence: 99%

Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Doran

Laske

2019

JGR Solid Earth

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“…Crumpler et al (1996) suggest the blocks might represent slide material derived from the volcano flank. The blocks do resemble, at least superficially, landslides shed from the Hawaiian islands, particularly those north of Oahu-e.g., the Nuuanu landslide (Moore et al, 1989(Moore et al, , 1995Naka et al, 2000). However, there is no obvious source on the flank.…”

Section: Flankmentioning

confidence: 99%

Tharsis Tholus: an unusual martian volcano

Plescia

2003

Icarus

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Tharsis Tholus is unusual martian shield volcano in that the edifice is cut by a series of large normal faults that appear to penetrate the entire volcano. Northeast-trending narrow graben also cut the flank. The large normal faults may be caused by loading of a ductile subsurface layer allowing failure of the edifice; the narrow graben are typical tensional faults. The flank is heavily mantled by aeolian material. Despite the bulbous appearance, the overall morphology of Tharsis Tholus suggests it is a basaltic shield. Crater counts indicate an age of early Hesperian placing Tharsis Tholus in the middle of the period of activity that built the other small Tharsis volcanoes. Published by Elsevier Inc.

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“…The fluffy deposit was composed mostly of CaCO 3 (calcite) and amorphous iron, and high γ‐ray emission was observed in the same area (Hattori & Okano 1998). The low‐temperature vent (6.9°C) at the base of Loihi Seamount (4772 m deep), Hawaii, showed yellow patches (Naka et al . 2000).…”

Section: Resultsmentioning

confidence: 99%

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

Ogawa¹,

Takeuchi²,

Hattori³

et al. 2002

Island Arc

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The manned submersible Shinkai 2000 investigated yellow patches on the near‐summit slope of Shiribeshi Seamount in the Japan Sea. Yellowish patches are often associated with seepage, and the possibility of seepage at Shiribeshi Seamount was tested by the following four lines of observation: (i) high subsurface temperature was measured at a ring‐like patch, although no increase in subsurface temperature was observed at other patches; (ii) high gamma ray (γ‐ray) intensity from the thorium series was recorded in the patch zone; (iii) the yellowish deposit was composed of calcite, quartz and amorphous iron compound, as seen at the yellowish patches in other seeps and volcanoes; (iv) lipid phosphate, a measure of microbial abundance, in sediments of the ring‐like patch was determined, and the recorded microbial abundance was higher inside the patch than outside it. The four lines of observation are explained consistently by postulating that the seepage of warm fluid contained Fe and γ‐ray sources. A hydrothermal origin of the yellow patches is not ruled out for the extinct but young (0.9 Ma) arc volcano.

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Tectono‐magmatic processes investigated at deep‐water flanks of Hawaiian volcanoes

Cited by 21 publications

References 5 publications

Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Tharsis Tholus: an unusual martian volcano

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

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