On Jun 2, 9:00 pm, Petra <petras... at (no spam) hotmail.com> wrote:
On Jun 2, 6:37 am, Weatherlawyer <Weatherlaw... at (no spam) hotmail.com> wrote:
On May 31, 5:53 pm, Petra <petras... at (no spam) hotmail.com> wrote:
Hi Everyone,
Far field trigger up to present has not been acknowledged as having
any merit, but according to this article from Bret-bart that's
changing..
Quakes can be triggered from other side of globe: study
May 25 01:33 PM US/Eastern
A major quake such as the one that left at least 60,000 dead in
southwestern China this month can trigger other earthquakes half way
around the world, according to a study released Sunday. This
unexpected finding could one day help make better predictions about
the frequency and intensity of aftershocks, the lead researcher told
AFP. A team of geologists in the United States found that 12 out of 15
major quakes -- registering a magnitude of 7.0 or higher -- since 1990
generated surface waves that set off smaller seismic events in fault
systems on distant continents.
The China quake, which measured 8.0 on the Richter scale, was not
included in the study, which was published in the British journal
Nature Geoscience.
'It was known that these surface waves could travel,' explained co-
author Tom Parsons of the US Geological Survey.
'But most scientists thought these so-called dynamically-triggered
earthquakes were a special case. In fact they happen all the time,
everywhere, and that was something of a surprise,' he said in a phone
interview.
The terrible December 2004 mega-quake off the coast of Sumatra,
Indonesia, for example, provoked seismic events as far away as Alaska,
California and Ecuador.
There is a better than 95 percent likelihood that the earthquake rate
in distant areas will be much higher in the immediate aftermath of a
big quake than before or after, the study found.
And while the seismic movements triggered by far away quakes were
generally smaller -- in the three-to-five magnitude range -- there is
no reason they could not be as big or bigger than the first.
'They could be any size,' said Parsons, who in previous research
identified eight cases in the last quarter century in which a 7.0-or-
bigger earthquake led to another that was even larger.
To measure the impact elsewhere on the planet of major tremblors,
Parsons and colleagues analysed broadband seismographs from over 500
stations, part of a worldwide monitoring network.
By searching for the lowest frequencies and filtering out the highest,
they detected a sharp increase in the number of distant quakes
triggered by a main quake, even though the tectonic environment of the
two regions were independent.
'The big question is aftershocks, and what happens after you have a
big earthquake,' said Parons, adding that there are two competing
theories as to how such follow-on quakes are unleashed.
Static triggering occurs within a few fault lengths of the main
rupture, often in a cascading effect. But impact generally peters out
beyond a 100-to-200 kilometre (70-to-140 mile) radius.
The spike in quake activity further afield can only be explained by
dynamic triggering, explained Parsons.
Such seismic waves travelling along the surface of the earth 'keep
their amplitude and do not diminish that much even over great
distances,' he said.
The key to predicting the aftermath of a quake such as the one in
China will be teasing apart the role of static and dynamic
triggering.
'We can look at the aftershocks and start to learn, but we need to
know what percentage of those are dynamically triggered because the
effect isn't lasting, it's transient,' Parsons explained.
'Once those waves are gone, the effect is mostly over with, we really
don't have to worry about that any more.'
http://www.breitbart.com/article.php?id=080525173254.8uczuvwc&show_ar...
The term mendacious comes to mind from looking at the other articles
on the home page for the link. Which is a pity if the original
theorists are looking for truth.
Like the kingdom of heaven it is a seed that must produce fruit.
Truth, if followed instead of erroneous theories and ideals, will
eventually be arrived at. The only things putting the conclusion off
is the degree of discomfort involved for the researchers and the
attrition of meddlesome fools.
That or they are wrong.
But since some of their conclusions seem to align with my own, that
last is unlikely.- Hide quoted text -
- Show quoted text -
Hi Mike,
Perhaps it's more understandable for me because I used it a number of
times last
year to issue predictions including the M 4.6 in Israel with
successful results.
And to that end most scientists will tell you they can't predict
earthquakes using
any method and that's true because they have no hands-on practical
experience.
Hey, here's a link to my favorite music web site, see if you like it.
You can chose
your songs... Ashbury is pretty good as most of them....
http://www.morgan-page.com/
Is that a joke?
Sounds like stock stock Aitken and Waterman. Muzak for very sad
people.- Hide quoted text -
- Show quoted text -
