PubTalk 1/2007 — The Hidden World of the Golden Gate

Download Video
Right-click and save to download

Detailed Description

How tides, currents, and humans have created an array of sea-floor features

By Patrick Barnard, Marine Geologist, and Peter Dartnell, Physical Scientist

  • A century of technical advances allow scientists to identify and visualize spectacular sea-bottom features
  • Recent collaborative research outside the Golden Gate found that 100 million cubic yards of sediment disappeared in the past 50 years
  • Swift, powerful tidal currents have scoured the Golden Gate down to bedrock and moved massive amounts of sediment
  • Giant sand waves near the Golden Gate reach 30 feet in height and more than 700 feet in wavelength
  • Why is the sediment in this area mostly from local sources, while farther out to sea are masses of sediment derived from erosion of the Sierra Nevada?

Details

Image Dimensions: 200 x 136

Date Taken:

Length: 01:06:58

Location Taken: Menlo Park, CA, US

Transcript

Contact wmcesic@usgs.gov for transcript.