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Ground cracking and differential settlement owing to liquefaction of beach and Salinas River deposits damaged approach and abutment of bridge linking Moss Landing spit to the mainland, near Moss Landing Marine Laboratory in the Oct. 17, 1989, Loma Prieta earthquake. Links to 768x512, 192K JPG. Credit: J.C. Tinsley, U.S. Geological Survey. |
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Sand boil or sand volcano measuring 2 m (6.6 ft) in length erupted in median of Interstate Highway 80 west of the Bay Bridge toll plaza when ground shaking transformed loose water-saturated deposit of subsurface sand into a sand-water slurry (liquefaction) in the Oct. 17, 1989, Loma Prieta earthquake. Vented sand contains marine-shell fragments. Links to 512x768, 224K JPG. Credit: J.C. Tinsley, U.S. Geological Survey. |
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Astronaut Carl Walz installs MGM test cell on STS-79. Operations on STS-89 will be essentially the same. Links to 1536x1052-pixel, 416K JPG. Credit: NASA/Johnson Space Center. |
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Author: Dave Dooling
Curator: Bryan Walls
NASA Official: John M. Horack