Physiography of the Monterey Bay National Marine Sanctuary and implications about continental margin development

Greene, H. Gary; Maher, Norman; Paull, C. K.

doi:10.1016/s0025-3227(01)00261-4

Cited by 133 publications

(96 citation statements)

References 32 publications

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“…High slope angles (>20°) coincident with amphitheatre rims, slump headwalls and flute features suggest that retrogressive erosion was taking place and is comparable to active areas of mass wasting documented in, for example, Ascension Canyon, Monterey Bay, USA (Greene et al, 2002). Processes causing mass wasting include oversteepening of canyon walls and drainage basins, and undercutting of canyon walls by turbidity currents causing instability and subsequently slope failure (Greene et al, 2002and Lo Iacono et al, 2011 report the preferential erosion of the western flanks of Penmarc'h and Guilvinec canyons (Bay of Biscay) as evident by numerous gullies and flutes, while the eastern flanks are draped with soft sediment. The same pattern is described for the Dangeard and Explorer canyons (Fig.…”

Section: Canyon Evolutionmentioning

confidence: 74%

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Stewart

Davies

Guinan

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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The Celtic Margin is a complex area in terms of sedimentary dynamics and evolution, with a number of submarine canyons dissecting the continental slope and outer continental shelf. The complex terrain and diverse range of sea-bed sediments play a part in submarine canyons being described as areas of high habitat heterogeneity. This study has concentrated on the heads of two canyons: Dangeard (also known as Dangaard) and Explorer (first named here) located in UK territorial waters, in water depths between 138 and 1165 m. Multibeam echosounder, 2D reflection seismic and photographic ground-truthing data have been combined to map the sea-bed geomorphology, sedimentary features and canyon megafauna of these canyons. In addition, two previously unknown provinces of cold-water coral (CWC) mini-mounds were discovered on the interfluves of the Dangeard and Explorer canyons.The study area comprises a dendritic network of gullies feeding into the canyon thalwegs. Amphitheatre rims, where slope angles are commonly in excess of 20°, occur along the margins and heads of both canyons and are interpreted as drainage basins indicative of retrogressive mass-wasting in a shelfward direction.The CWC mini-mounds occur in water depths between 250 m and 410 m, with more than 400 mounds identified. They are up to 3 m in height and 50-150 m in diameter with no sub-surface expression, suggesting these mounds are, in geological terms, relatively young and possibly Holocene in age. Biological analyses revealed that the mounds form a habitat for ophiuroids and Munida associated with Lophelia pertusa coral rubble, suggesting these mini-mounds are not present-day living features.

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Section: Canyon Evolutionmentioning

confidence: 74%

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Stewart

Davies

Guinan

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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“…1). The Monterey Submarine Canyon, one of the largest canyons in the world (Shepard 1973), divides the bay into 2 nearly equal shallower shelves (up to 140 m deep and 10 to 15 km wide), with deeper waters over the canyon in the center of the bay (Greene et al 2002;Fig. 1).…”

Section: Study Areamentioning

confidence: 99%

Marine mammal response to interannual variability in Monterey Bay, California

Burrows¹,

Harvey²,

Newton³

et al. 2012

Mar. Ecol. Prog. Ser.

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The coastal upwelling ecosystem near Monterey Bay, California, is a productive yet variable ecosystem and an important foraging area for many mobile apex predators, such as marine mammals. Long-term studies are necessary to better understand how wide-ranging predators respond to temporal environmental variability; however, few of these studies exist. We conducted monthly shipboard line-transect surveys in Monterey Bay from 1997 to 2007. We identified 22 species of marine mammals, and calculated monthly and annual densities for the 12 most commonly sighted (focal) species. Species richness remained relatively constant (mean richness ± SE: 13.7 ± 0.396 species yr ) during the 1997/1998 El Niño event. There were no statistically significant differences in the densities of marine mammal species between warmer and cooler years. The community and species-specific responses of marine mammals to warm-water years differed depending on the mechanism of oceanographic variability. During the 1997/1998 El Niño (a basin-wide event), marine mammals aggregated in nearshore areas, such as Monterey Bay, with relatively greater productivity than offshore regions, whereas during anomalous upwelling conditions of 2005 (a more localized oceanographic event), marine mammals redistributed away from Monterey Bay to areas less affected by the anomaly.

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“…The San Gregorio-Hosgri (Dickinson et al 2005) is a well-documented significant right-lateral fault of Late Cenozoic age (,150 km displacement) and it parallels other, less significant faults in the area (Hall 1991). The offshore relationship of the Pacific plate to the terrane are largely unresolved (Greene et al 2002). However, it appears that the continental fragment is attached to the offshore Monterey oceanic plate as no known major faults separate the two (Ewing and Talwani 1991;Londsdale 1991).…”

Section: Geotectonic Background and Terminologymentioning

confidence: 99%

Tectonic underplating of trench sediments beneath magmatic arcs: the central California example

Ducea

Kidder

Chesley

et al. 2009

International Geology Review

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Physiography of the Monterey Bay National Marine Sanctuary and implications about continental margin development

Cited by 133 publications

References 32 publications

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Marine mammal response to interannual variability in Monterey Bay, California

Tectonic underplating of trench sediments beneath magmatic arcs: the central California example

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