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Science Forum Index » Geology - Earthquakes Forum » first motion solutions...
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| Skywise... |
 Posted: Tue Jul 29, 2008 4:58 pm |
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| George... |
| Posted: Tue Jul 29, 2008 8:53 pm |
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"Skywise" <into at (no spam) oblivion.nothing.com> wrote in message
news:qoMjk.6$su.3 at (no spam) newsfe24.ams2...
Given the location, I was half expecting it to show thrust movement. Thanks
for the links, Brian.
George |
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| rick++... |
| Posted: Wed Jul 30, 2008 6:36 am |
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The main plate tectonic boundary, about 60 miles to the north,
has a westward kink in it. So theres a wide compressive zone
of splay faults and microplates along side it.
I used to work for a now defunct geology company very near
the epicenter. When I jogged through the orange orchards
and oil fields in the area I notice many hill slopes were much
steeper the angle of repose. This indicates active tectonics
that gets ahead of erosion. (Dont ask me about flood terraces
in the Santa Ana basin!).
A concern in a recent issue of Science journal is whether the
L.A. region could repeat what happened in Sichuan China in
May and trigger an "uber-quake" from a cascade of several
smaller faults breaking in a row. Some seismologists thought
Sichuan was just a moderately risky area until multiple faults
broke together. In L.A. you could have the Elsinor-Chino-Whittier-
downtown-L.A. -San Fernando possibly cascading, but unlikely.
US seismologists have been building stress-models of this
scenario in the computer. But reality throws surprise balls
sometimes. |
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| Skywise... |
| Posted: Wed Jul 30, 2008 8:57 pm |
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"rick++" <rick303 at (no spam) hotmail.com> wrote in news:1b050437-4f2d-4b1e-abd6-
33d2c46014ca at (no spam) 27g2000hsf.googlegroups.com:
Quote: A concern in a recent issue of Science journal is whether the
L.A. region could repeat what happened in Sichuan China in
May and trigger an "uber-quake" from a cascade of several
smaller faults breaking in a row.
Was not Landers the first "obvious" instance of this occuring?
I seem to recall scientists were quite put back by the result.
Off the top of my head recalling the faults here, I don't think
there's much possibility of it occuring in the LA Basin proper.
I'll have to look at the maps again in detail.
Brian
--
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html
Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html
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