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Nehalem Bank (Clatsop County, Oregon)

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Nehalem Bank
The Shale Pile
Nehaalem Bank is located off the Oregon coast in the Pacific Ocean
Nehaalem Bank is located off the Oregon coast in the Pacific Ocean
Nehalem Bank
Nehalem Bank
LocationPacific Ocean, near Tillamook Head
Coordinates45°54′00″N 124°33′00″W / 45.90000°N 124.55000°W / 45.90000; -124.55000
TypeBar
Ocean/sea sourcesPacific
Basin countriesUnited States
Surface area74.6 square kilometres (28.8 sq mi)
Max. depth160 metres (520 ft)
IslandsNo islands

Nehalem Bank is a bar, off the coast of Oregon, United States. It also has both rocky reefs and mud habitat, and is just northwest of Garibaldi Reef.[1][2][3]

Nehalem Bank runs between 150 metres (490 ft) and 200 metres (660 ft) deep, having an area of 74.6 square kilometres (28.8 sq mi).[4] It is located off Tillamook Head, hence is off Clatsop County, and is barely south of the mouth of the Columbia River and Astoria Canyon.[5] Nehalem Bank is north of Nehalem Bay.

Nehalem Bank is one of the three major offshore banks of Oregon, the other two being Heceta Bank and Coquille Bank.[6] Nehalem Bank compares in size to Heceta Bank.[7]

Fishing

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Nehalem Bank has been trawled, for shrimp.[8]

As of 2020, it is illegal to fish the Nehalem Bank with bottom trawl gear.[9]

Oceanography and Geology

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Nehalem Bank has underwater sea stacks and paleoshorelines. There are rocky remnants of former seacliffs which are bored with intertidal pholad clam holes, testifying to what the level of the sea once was.[5]

Methane seeps are found, on Nehalem Bank, also, on Heceta Bank and Coquille Bank. These sites have microbial communities, also known as bacterial mats, in patches close to the sources of methane bubbles. They use methane for their metabolism. Whether the methane could be used the generate power is problematic, introduces many questions.[10]

A north-and northwest-striking geologic fault, the Nehalem Bank Fault, crosses the Nehalem Bank, is estimated to slip 0.5 to 5 millimeters per year.[11][12] In the forearc of the Cascadia Subduction Zone, this fault underlies the continental shelf.[13]

See also

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References

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  1. ^ Gockel, Catherine (December 9, 2016). "Oregon Department of Fish and Wildlife" (PDF). Retrieved 2020-12-27.
  2. ^ Gockel, Catherine. "Offshore Seafood Processors in Federal Waters Off the Coast of Washington and Oregon (WAG520000)" (PDF). EPA. Retrieved 2020-12-27.
  3. ^ Hannah, Robert. "Information Reports Number 2014-03" (PDF).
  4. ^ Hannah, Robert. "Effects of trawling for ocean shrimp (Pandalus jordani) on macroinvertebrate abundance and diversity at four sites near Nehalem Bank, Oregon" (PDF).
  5. ^ a b Embley, Bob. "Mapping Ancient Shorelines". Retrieved 2020-12-26.
  6. ^ Milstein, Michael (March 8, 2008). "Oregon tsunami may turn out bigger than thought". Retrieved December 28, 2020.
  7. ^ McNeill, Lisa C. (August 2000). "Tectonics of the Neogene Cascadia forearc basin: Investigations of a deformed late Miocene unconformity" (PDF). Retrieved 2020-12-28.
  8. ^ Hannah, Robert. "Fish Division Oregon Department of Fish and Wildlife" (PDF).
  9. ^ Floyd, Mark (June 6, 2018). "Oregon's Methane Coast". Retrieved 2020-12-26.
  10. ^ "Nehalem Bank fault (Class A) No. 789".
  11. ^ Personius, Stephen F. "Map and data for Quaternary faults and folds in Oregon" (PDF).
  12. ^ Personius, S.F. (May 17, 2002). "Quaternary Fault and Fold Database of the United States". Retrieved 2020-12-28.
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General references

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Geologic references

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