Natural Oil Seeps in Southern California

[Leroy N. Soetoro]

https://incidentnews.noaa.gov/incident/8934/22546/26338

Crude oil and natural gas naturally enter the ocean at areas known as
“seeps.” The offshore seeps along the Southern California coast are
particularly visible, abundant, and well-studied.

Offshore seeps in Southern California add about 5 million gallons of oil
to the ocean annually, with wide year-to-year variation (National Academy
of Sciences, 2003).

Though from a natural source, oil from seeps shows similar appearance,
behavior, and effects as oil released during drilling and other human
activities.

Oil from seeps affects fish, birds, and wildlife; can impair surface
waters and shorelines; and can impact recreational activities.

What are seeps?
Seeps are areas where oil and natural gas naturally leak out of the ground
through fractures and sediments, in the same way freshwater springs bring
water to the surface.

How common are they in California?
The waters off Southern California host hundreds of known, naturally
occurring oil and gas seeps, with more documented on land. Although their
rate of release may vary over time, their locations are consistent and
predictable. Slicks from many larger seeps are visible by satellite, and
some are persistent enough to be features on navigation charts.

More at link.

What are the impacts of seep oil?
Oil from seeps has been found to be toxic to fish, sea stars, and shrimp,
with the toxic effects largely limited to the immediate seep area.

According to a 2014 study by Henkel et al., more than 1,000 birds
each year are oiled in Southern and Central California, primarily due to
natural seeps. The greatest number of oiled birds was found in Santa
Barbara County. Tarballs from seeps washing up on Southern California
beaches have long been a nuisance to beachgoers, while boaters moving
through slicks from natural seeps may detect noxious odors.

For more information about NOAA’s Office of Response and Restoration,
visit response.restoration.noaa.gov or call (301) 713-2989.

U.S. Department of Commerce | National Oceanic and Atmospheric
administration
May 2015

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