Quote:
Originally Posted by dd74
I've heard this theory before. I was told that many houses in the Hollywood Hills are built on rock, and will best withstand a major earthquake. Anything near or on the coast, however, is as good as collapsed.
BTW: felt just a slight jolt and roll where I live.
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During the Northridge quake we saw the direct results of this on our water distribution system. The really old pipes over in the Santa Sussana hills had minimal damage if any. On the other side of the valley over by the Marr Ranch out in to Tapo Canyon, tons of broken pipes. Million gallon water tanks moved 15 inches snapping fittings. A lot was learned from that quake, like vertical accelerations CAN exceed one G.