The geology of the New Hebrides

Mawson, Douglas

doi:10.5962/bhl.part.12911

Cited by 24 publications

(25 citation statements)

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“…sea-level. 5 The present writer's field observations accord with these published statements, which indicate a recent, lengthened stand of the sea along the Maine coast at a level nearly 20 feet higher than the existing high-tide level.…”

Section: Field Observationssupporting

confidence: 92%

“…The marks of the old strand may be drowned, or else elevated to heights which are not to be directly correlated with the heights of the old strand in undisturbed rocks. 5. In special cases the eustatic shift may locally cause a change in the tidal range, affecting the datum if this be high tide.…”

Section: Field Observationsmentioning

confidence: 97%

“…However, he gives the average elevation of the Irish beaches as 15 feet. 5 may be connected with the difference of datum-levels assumed in the two countries. Ordnance datum in Ireland is 8 feet below Ordnance datum for Great Britain (mean water-level at Liverpool, which is practically the same as in Ireland).…”

Section: Field Observationsmentioning

confidence: 99%

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A Recent Worldwide Sinking of Ocean-level

Daly

1920

Geol. Mag.

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LOCAL uplift and local sinking of the earth's surface have been fully demonstrated for past geological epochs. The amounts of these movements have generally been stated with reference to the present sea-level, and for the greater movements the statements of magnitudes are not seriously impaired by the fact that general sea-level itself has been shifting, upwards and downwards, through geological time. Among the causes for general or “eustatic” shifts of sea-level are: appropriate crustal movements whereby the volume of the ocean basin has been changed; delta-building and volcanic eruption on the sea-floor, the displacement of sea-water not being compensated by crustal sinking; volcanic addition of new water to the ocean; subtraction of water which becomes chemically bound during the alteration of rocks; glaciation on land, lowering sea-level by the abstraction of water from the ocean; deglaciation on land, raising sea-level; changes in the earth's centre of gravity and in her speed of rotation.

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Section: Field Observationssupporting

confidence: 92%

Section: Field Observationsmentioning

confidence: 97%

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A Recent Worldwide Sinking of Ocean-level

Daly

1920

Geol. Mag.

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“…8) produced a flank collapse in hydrothermally altered (and weakened) rocks that generated a 12-m-high local tsunami in 1878. Historical records from Port Resolution indicate a large landslide temporarily blocked the mouth of the bay (PATTON, 1894) and uplifted the west side of the bay by 6 m (PATTON, 1894;LAWRIE, 1898;MAWSON, 1905). The 1878 Port Resolution tsunami is likely to have resulted from an earthquake triggered submarine landslide.…”

Section: Thermal Alterationmentioning

confidence: 99%

Island Edifice Failures and Associated Tsunami Hazards

Keating¹

2000

Pure and Applied Geophysics

137

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Volcanic ocean islands are prone to structural failure of the edifice that result in landslides that can generate destructive tsunamis. These island landslides range enormously in size, varying from small rock falls to giant sector failures involving tens of cubic kilometers of debris. A survey of literature has allowed us to identify twenty-three processes that contribute to edifice collapse. These have been divided into endogenetic and exogenetic sources of edifice failure. Endogenetic sources of instability and failure include unstable foundations, volcanic intrusions, thermal alteration, edifice pore pressures, unbuttressed structures, and buried faults. Exogenetic sources of instability and failure include collapse of subaerial or submarine deposits, endo-upwelling, karst megaporosity, fractures, oversteepening, overloading, sea-level change, marine erosion, weathering including hurricanes, glacial response, volcanic activity, regional uplift or subsidence, tectonic seismicity and anthropogenic agents. While the endogenetic sources dominate during periods of active volcanism and cone building, the exogenetic sources may cause failure at any time. Tsunamis, both small and large, are associated with these edifice failures.

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“…The exposures were discovered by Mallick and Greenbaum (1975, p. 8, 9) of the New Hebrides Survey while they were mapping on Santo. They named the beds the Navaka Sands and the Kere Shell bed and identified the N avaka Sands with the Tasiriki foundation beds found by Mawson in 1905 on the southwes:t coast of Santo. The first fos•sils sent by Mallick and Greenbaum to the U.S.…”

Section: Paleontology Geographic and Geologic Distribution Of Speciesmentioning

confidence: 99%

Cenozoic fossil mollusks from western Pacific islands; gastropods (Eulimidae and Volutidae through Terebridae)

Ladd¹

1982

Professional Paper

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The geology of the New Hebrides

Cited by 24 publications

References 0 publications

A Recent Worldwide Sinking of Ocean-level

A Recent Worldwide Sinking of Ocean-level

Island Edifice Failures and Associated Tsunami Hazards

Cenozoic fossil mollusks from western Pacific islands; gastropods (Eulimidae and Volutidae through Terebridae)

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