Difference between revisions 113734841 and 113734843 on dewiki

[[Image:122-38HaywardFault.jpg|thumb|300px|For recent activity in the region shown on this map see [http://quake.wr.usgs.gov/recenteqs/FaultMaps/122-38.htm the USGS map for this location.] With appropriate browser settings the "live" maps will also show all of the names of faults shown on the map as you rollover with the cursor.]]

(contracted; show full)
A severe earthquake is more likely to disable the offshore causeway portions of [[Interstate 80 (California)|Interstate Highway 80]] (the [[Eastshore Freeway]]), since it is built on fill placed in the 1930s atop mudflats whose upper layers were deposited in the 19th century as a result of extensive [[placer mining|hydraulic gold mining]] in the distant [[Sierra Nevada (U.S.)|Sierra Nevada]] mountain foothills. This soft mud is expected to amplify earthquake shaking, and the 
fill on top of the mudmud supporting the heavy fill may liquefy, and so possibly cause major disruption of the highway due to failure by sinking of the highway and by differential movement of large sections. (More modern construction for these conditions employs linked and "floating" - in mud - lightweight [[concrete]] and plastic foam box structures to support a road.) Similar conditions underly the eastern approach roads the Bay Bridge. Better, but still locally poor soils underlie the portion of [[Interstate 880 (California)|Interstate Highway 880]] that extends to the South Bay region from the eastern terminus of the [[San Francisco-Oakland Bay Bridg(contracted; show full)[[Category:Geography of Alameda County, California]]
[[Category:Geography of Contra Costa County, California]]
[[Category:Geography of the San Francisco Bay Area]]
[[Category:Napa County, California]]
[[Category:Solano County, California]]
[[Category:Seismic faults of California]]

[[fr:Faille de Hayward]]