Sub-Oceanic Changes

Milne, J. G.

doi:10.2307/1774597

Cited by 27 publications

(6 citation statements)

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“…Many ancient examples of submarine canyons and channels have now been recognized (see review by Whitaker, 1976), but detailed facies descriptions of their sedimentary fill remain rare. For the two slope channels described in this paper, it is argued that whereas the channels originated by a mechanism similar to that envisaged by Milne (1897), they then functioned as conduits that funnelled terrigenous sediment to deep water, ac argued by, for example, Shepard & Dill (1 966).…”

Section: Introductionmentioning

confidence: 77%

Trench‐slope channels from the New Zealand Jurassic: the Otekura Formation, Sandy Bay, South Otago

Carter

1979

Sedimentology

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The Otekura Formation (Early Jurassic, Pseudaucella zone) at Sandy Bay comprises part of a 10+ km thick, regressive, forearc shelf and slope sequence, the Hokonui facies belt of the Rangitata Geosyncline. The Otekura Formation is dominantly fine grained, being mostly mudstone, silty mudstone and siltstone. The sediments are volcanogenic throughout. The upper 150 m of the formation contains two 20 m thick, channelized bodies of medium‐thick bedded sandy flysch, each associated with thin bedded muddy flysch interpreted as overbank turbidites. Directional indicators within the channel sequence indicate emplacement from the south‐southwest. In contrast, rare turbidites that occur below the channel sequence, within the background mudstone sediment, were emplaced from the east, i.e. at right angles to the channelized flows. The immediately overlying Omaru Formation contains more abundant macrofossils, intraclastic conglomerates, and appreciable amounts of traction‐emplaced cross‐bedded sand. Bioturbated calcareous siltstones with an in situ molluscan fauna follow (Boatlanding Formation), and are of shelf origin. The Omaru Formation is therefore interpreted as a shelf‐slope break deposit, and the Otekura Formation as an upper slope facies. Reconnaissance studies indicate that the Otekura Formation is underlain by several kilometres of dominantly fine grained, deep water slope sediments, containing occasional sand and conglomerate filled channels similar to those here described in detail from the Otekura Formation. Such channels are inferred to form when a mass‐transported sand, derived from failure higher on the slope, ploughs erosively into the sea floor. After their incision, the channels served for a short time as conduits for downslope transport of sediment, the redeposited deposits of which are found filling each channel. Both channel fills at Sandy Bay are capped by thin‐bedded turbidites inferred to have overspilled from similar channels nearby on the slope.

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Section: Introductionmentioning

confidence: 77%

Trench‐slope channels from the New Zealand Jurassic: the Otekura Formation, Sandy Bay, South Otago

Carter

1979

Sedimentology

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“…Likewise, Milne (1897) alluded to three cable breaks that followed an earthquake off the Grand Banks, Newfoundland, in 1884, again without recognition of the precise cause.…”

Section: Insights Into Submarine Geohazards From Breaks In Subsea Telmentioning

confidence: 99%

Insights into Submarine Geohazards from Breaks in Subsea Telecommunication Cables

Carter¹,

Gavey²,

Talling³

et al. 2014

oceanog

167

121

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“…For one hour following the earthquake there occurred a sequence of breaks: number 1 cable was broken in two places (1 & Z), probably followed by the breakage of the cables between The reported cable breaks took place at epicentral distances between 1100 and 1300 km. They all occurred in areas where there have been many interruptions in the past, none of which was associated with seismic activity, Milne (1897). For instance, off the Rovuma River, cable number 1 had broken down at least eight times between the mid 1880s and 1908, very close to points 1 and 3 in Fig.…”

Section: S U B M a R I N E C A B L E B R E A K Smentioning

confidence: 79%

The Rukwa earthquake of 13 December 1910 in East Africa

Ambraseys

1991

Terra Nova

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We reappraised the Rukwa earthquake of 1910 in the East African Rift System. With a magnitude of 7.4, no earthquake in East Africa is known to be larger and it is rivalled only by the recent earthquake in southern Sudan on 20 May 1990. More than 80 per cent of the moment release in the Rift during the last 110 years is due to the Rukwa earthquake and its aftershocks that occurred between the Tanganyka and Nyasa systems. In spite of its large magnitude, the Rukwa earthquake caused very little damage to local types of dwellings and no loss of life. With increasing development of urban areas with modern types of houses, there is now increasing risk in East Africa from major earthquakes.

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Sub-Oceanic Changes

Cited by 27 publications

References 0 publications

Trench‐slope channels from the New Zealand Jurassic: the Otekura Formation, Sandy Bay, South Otago

Trench‐slope channels from the New Zealand Jurassic: the Otekura Formation, Sandy Bay, South Otago

Insights into Submarine Geohazards from Breaks in Subsea Telecommunication Cables

The Rukwa earthquake of 13 December 1910 in East Africa

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