Liquefaction severity California

[sbatta]

What does liquefaction severity 6 mean for a lot when it is also on fault line? Does building department even allow to build there? If yes, how expensive is it going to be?

 

[bimr]

As you can see from the link, it on the low end of severity. One would be able to build there. It will depend on the location and what you are trying to construct.

Very sparsely distributed minor ground effects include sand boils up to 0.5m (1.5 ft) in diameter, minor ground fissures with openings up to 0.1m (0.3 ft) wide, ground settlement up to 25 mm (1 in.). Effects lie primarily in areas of recent deposition and shallow groundwater surface, such as active floodplains.

http://web.mst.edu/~rluna/us60eq/LSI.htm

 

[cvg]

why would you want to build right on a fault? you may not be permitted to build there. even if you manage to engineer it properly and get the permits, the property values will still be lousy.

 

[racookpe1978]

California "faults" tend to be (locally) very small across - One visible section of the San Andres north of San Francisco is visible in a road cut on the north of Golden Gate as a band of crushed rock less than 4 feet across. But across the whole valley, multiple "strings" of faults and segments are often found. The fault zone movement (of high displacement sideways) is much more than just the distance across the fault line itself - and that fault line may have dozens - if not hundreds - of individual "faults" that make up the whole "line"

Liquefaction is a very, very localized effect in landfill areas, and even more so on slopes where the hill slumps in 100 - 150 circles. Is stable for 1/4 mile, then slumps again. A few rains later, another hill (otherwise looking identical) slumps nearby - but then stays still for ten years.

In the 1989 earthquake when several buildings sunk their first and second floors into the land fill on the Bay side of the city, one building sunk 15 feet. the one next door did not move.

 

[sbatta]

So it's hard to predict what happens? Is there any value in building stricter than code for seismic ground? What about using SIP panels? Nothing can help if ground sinks I understand that but is it going to help if house is built according to code?