This preview shows page 1. Sign up to view the full content.
Unformatted text preview: how strong the ground is going to shake where you are Weak sediments amplify the seismic shaking 1989 Loma Prieta M W 6.9 o Probably occurred on the Sargent fault, a subsidiary strand of the SAF o Nucleated ~ 15 km NE of Santa Cruz S.F. Bay o Avg. depth of the Bay is 4 ft, basically a big mudflat o The bay is a drowned, old river channel o Redwood poles in thick mud are the basis of the Bay Bridge because they couldnt piledrive down to the bedrock The Cypress Structure o A double-deck freeway in Emeryville (next to Oakland) o The slower the shear wave velocity, the weaker the sediment 1868 Great San Francisco Eq M W 7.0now called the Hayward Eq o Buildings on bayfill could not withstand earthquakes Relearned same lesson in 1906 Eq...
View Full Document
This note was uploaded on 01/27/2009 for the course GEOL 240Lxg taught by Professor 12:30-01:50pm during the Fall '07 term at USC.
- Fall '07