Structure of the upper Monterey Submarine Fan Valley.
Hamlin, James Sherrill, Jr.
Von Schwind, J.J.
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Seismic and 3.5 kHz acoustic reflection profiles were collected over the Monterey Submarine Fan Valley on two separate cruises. The 3.5 kHz profiles show the flatness of the channel bottom and the difference in levee heights on either side of the channel . The seismic records show a channel migration by deposition The migration has been primarily to the southeast (to the left looking downstream) , with a few isolated cases of migration to the right downstream, possibly in response to a tendency to decrease the gradient of the channel in much the same way a subaerial stream will develop meanders in an attempt to decrease its gradient. It is felt that the horseshoe meander unique to this Fan Valley is related to this same mechanism and to the intersection with the Ascension Fan Valley. A secondary channel was observed beneath the western levee (right-hand levee looking downstream) of the Upper Monterey Submarine Fan Valley. It is believed that the Monterey Fan Valley and the secondary channel had different sources of sediment and that the secondary channel was deprived of its sediment supply approximately 1.9 million years ago.The thickness of sediments overlying basement beneath the Fan Valley was found to be about 800 m.
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