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.
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.
Astronaut Carl Walz installs MGM test cell on STS-79. Operations
on STS-89 will be essentially the same. Links to