Unformatted text preview: astating...things weakened,
then it's last straw and collapses; also people
think it's over…then you feel another again)
19 - buildings collapsing, being weakened, buildings shifted off foundations
Northridge; damage 20 - also where education comes in…how buildings are created in relation to earthquakes Seismogram of early aftershocks following the Northridge
earthquake, magnitude 3.0 to 5.9. There was a sharp drop
in aftershock frequency in the first four days.
21 7 - nature of structures - absolute devastation: buildings didn't have best foundaitions Earthquake destruction
Amount of structural
damage depends on - structural integrity was low…many people die Intensity and
duration of the
the structure - what building is built on:
- built on hard ignious = feel some shaking vs sedimentary ...
feel it more… then loose sediment, and mud
22 - ripping action, see where chunk is downthrown
Effects of Earthquakes:
Shaking: as the EQ waves
move through the area
fracturing and ________
of the ground surface Fault Scarp
23 - if loose sediment, sand/mud: means all spaces between particles is empty space, ﬁlled by water Effects of Earthquakes:
Liquefaction of the ground - water loobs particles so can...
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- Fall '14