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Science Forum Index » Geology - Earthquakes Forum » May an epicenter shift in following earthquakes(or...
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| Skype... |
 Posted: Wed May 14, 2008 7:24 am |
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| Can an epicenter possibly shift in aftershocks? |
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| Hatunen... |
| Posted: Wed May 14, 2008 1:33 pm |
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On Wed, 14 May 2008 10:24:02 -0700 (PDT), Skype
<hi.steven.tu at (no spam) gmail.com> wrote:
Quote: Can an epicenter possibly shift in aftershocks?
They almost always do after an earthquake has relieved the stress
in the area of the epicenter. There's been some fascinating info
on how earthquakes have marched along a major fault in Turkey
over the last century of so, with a heavily populated area next
in line.
--
************* DAVE HATUNEN (hatunen at (no spam) cox.net) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps * |
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| Thomas A. Russ... |
| Posted: Fri May 16, 2008 11:27 am |
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Skype <hi.steven.tu at (no spam) gmail.com> writes:
Quote: Can an epicenter possibly shift in aftershocks?
Well, I suppose the answer is yes and no.
First, it helps to be clear what an "epicenter" is. We'll start with a
different point, namely the "focus" or "hypocenter". That is the point
down inside the earth where the slipping for a particular earthquake
begins. This is usually far underground. The "epicenter" is the point
on the earth's surface directly above the starting point.
Now, that just indicates where an earthquake fault rupture STARTS. The
rupture then moves along the fault plane and it is actually an AREA that
ruptures. In very large earthquakes, the distance of the rupture is
measured in hundreds of kilometers.
Aftershocks are additional earthquakes that follow a large earthquake.
Each one is an earthquake itself. They are called aftershocks because
they are adjustments or reactions to the stress redistribution in the
main shock. Each aftershock will have its own epicenter, which will
almost always be in a different place than the epicenter of the main
shock.
So, for any given earthquake, there is one epicenter and it does not
move. Each aftershock will have its own epicenter which will typically
be in a different place from the main shock's epicenter.
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Thomas A. Russ, USC/Information Sciences Institute |
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| Aidan Karley... |
| Posted: Mon May 19, 2008 6:32 am |
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In article <mvbm241b5kogg6parhqb8ajf6ifbq1q6gn at (no spam) 4ax.com>, Hatunen wrote:
Quote: There's been some fascinating info
on how earthquakes have marched along a major fault in Turkey
over the last century of so,
North Anatolian Fault (or Fault Zone, if you want to be picky).
Quote: with a heavily populated area next
in line.
The big question is, will the next one be in Istambul/
Constantinople, or will the series splay off into the Sea of Marmara?
Two friends of my family went to Turkey to see the 1999 total
eclipse ; I don't know exactly where they were when the quake hit, but
it woke Mike up but didn't wake Mary. Which prompted one of the more
unusual slogans on an eclipse-photo tee-shirt when I found out about
it.
--
Aidan Karley, FGS
Aberdeen, Scotland
Message written at Mon, 19 May 2008 11:21 +0100, now I'm back on
shore. |
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