Oil-coated birds turning up on southern California beaches in recent weeks have raised concern about potential oil sources. The Coal Oil Point seep field, located offshore and adjacent to the University of California, Santa Barbara, is one of the biggest natural marine oil and gas seeps in the world and is the predominant source of oil to southern California waters. Extensive oil slicks have been observed near Coal Oil Point since the recent severe storms pummeled the region in January. These slicks are significantly larger than typically seen in the area, including just before the storms. Since 1994, scientists at UCSB have been studying the Coal Oil Point seep field, including using sonar to map the seepage.
Aerial photos off Coal Oil Point of a small portion of the Coal Oil Point seep field. Typical oil emissions from this seep area are shown in the left image (Current is to west, left). Right image shows typical conditions observed since the winter storms (Current is to east, right). Photos courtesy of Ira Leifer, UCSB, and Chris McCullough, Calif Dept of Conservation, Division Oil and Gas.
Recently UCSB scientists participated in aerial surveys of the northern channel. Current oil emissions appear to be many times pre-storm levels, estimated at 4,200 gallons per day. (Photos at www.ia.ucsb.edu/pa/1233-seep/)
New areas of seepage have appeared and were confirmed by boat surveys. Scientists at UCSB are studying a possible relationship between the storms and these increased oil emissions.
Gail Gallessich | EurekAlert!
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