Re: La Palma (Canary Islands) Volcanic tremors or swarms ?
- From: Weatherlawyer <Weatherlawyer@xxxxxxxxxxx>
- Date: Fri, 18 Sep 2009 07:26:45 -0700 (PDT)
On Sep 18, 7:24 am, olympichunee <asteroidjacq...@xxxxxxx> wrote:
On Aug 27, 8:08 am, Belba Grubb <trungsister...@xxxxxxxxx> wrote:
(Apologies, if this is a double post--there were problems.)
On Aug 26, 11:34 am, "CENTRINO" <n...@xxxxxxxxxxxxxx> wrote:
I have been also considering the heavy lorries traffic. In fact, if you look
at the daily spectrogram, you can see how it starts to show activity from 6
to 21 hours, but at night it declines. You even may even gess when it is
saturday or sunday. May be that the those "sunday nature lovers" take sunday
to discover the island using the secondary road at 20 meters from the
sesismograph.
Ha! A seismogram calendar! :-)
It's hard to say for sure what those signals are from (and please do
remember that I am not a scientist, just an enthusiast. I actually do
medical transcription for a living). Today I was able to find a sample
seismogram of traffic signals:http://www.quake.utah.edu/helicorder/GIFs/misc/websamples.html
(the bottom example). As you also note, they say that cultural "noise"
can be spotted by checking the time period on the display. However, if
the August 16th EHIG signals were from routine cultural noise, I would
have expected more a pause between the very late night/early morning
hours (since it was a Sunday) and then a rather heavier concentration
from roughly 11 a.m. to, oh, maybe 4 or 5 p.m. local time; it seems
much more spread out over some 10 hours. Also the signals seem to have
more a sharp peak somewhere in the middle that both comes on fairly
suddenly and drops off relatively quickly. Actually the EHIG tracing
seems a bit more like the "quarry blasts" sample above. No one would
be doing blasting on a Sunday, though (I hope!). I wonder if there is
a nearby shooting range, perhaps, and they were having a meet; those
often happen on Sundays, although they don't generally start at 1 a.m.
and run until 11 p.m. Or perhaps maybe there had been rain at some
point earlier, and a bit of soil loosened up, resulting in rock falls
that day? Given the nearby road, though, it's probably human activity,
but ??? what kind.
I did find the daily webicorder for EHIG and others athttp://www.ign.es/ign/es/IGN/volcanologia_senales.jsp. There is
really much more activity visible on the tracing for August 16th than
for the 26th. Very interesting.
About the megatsunami ... Well, nearly all the volcanic islands produce such
slides in their geological lives. It does not make me to lose sleep over.
Perhaps in the very long term there is a stadistic chance for such an event.
That's a good outlook. Yes, there is a similar chance of a flank
failure in our Hawaiian Islands and in the beautiful Cook Inlet of
Alaska, which would affect Anchorage and other towns and villages in
that area. Nature seems to levy a tax of danger on some of its most
beautiful areas, whether near plate edges (Alaska) or intraplate
(Hawaii and the Canaries).
About webcams: In La Palma island volcanos tiself, I could not find any.
There is one webcam pointing towards the central caldera in the island and
highest peaks, (nearly 3000 M hight), Webcam Valle de Aridane El Paso
Tajuya inhttp://www.meteosurfcanarias.com/es/001371-webcam-tiempo-en-directo-p...
For the Teide, the third largest stratovolcano in the world, in the
neighboring Tenerife Island. About 7.000 meters tall from the ocean floor,
and nearly 4000 m over sea level you have:http://www.iac.es/eno.php?op1=3&op2=7
You may notice that there are, in both islands, two very important
astronomical observatories, with webcams. That's becouse, the trade winds
keep canary atmosphere clean and Tenerife and La Palma reach levels well
over the "sea of clouds" as we call it.
Thank you very much for the webcam links! No volcanic activity seen,
fortunately, but again, just as when I looked up the weather, I am
struck by what a pleasant place your land must be.
Here are some links on Canary Islands volcanism for anyone who is
interested (I didn't know much about it at all until this thread
started):http://vulcan.wr.usgs.gov/Volcanoes/CanaryIslands/description_canary_...
andhttp://www.volcano.si.edu/world/region.cfm?rnum=1803(notsure if
this one works) .
It's good news that historic eruptions there have been preceded by a
lot of seismicity. A Web search also showed that there is a lot of
controversy about the volcano hazards there, isn't there. That happens
everywhere. It's always so terribly difficult when natural hazards and
economic issues like tourism collide.
Teide, a Decade Volcano, is so beautiful! (I found a site about it
here:http://delteide.com/index.shtml)
There are also some observatories in Hawaii that look out over the
"sea of clouds." I searched one of my favorite sites, the Astronomy
Picture of the Day, and found some images related to Teide. Here is
the observatory there this past February, seen from a slightly
different perspective than one gets through the webcam (BG):http://antwrp.gsfc.nasa.gov/apod/ap090212.html
And this shows the quality of the images those telescopes can pick up:http://antwrp.gsfc.nasa.gov/apod/ap080630.html
¡Muy hermoso!
Ps. Excuse my english.
:-) Your English is *very* good. My Spanish would give you a big
laugh! I taught myself the basics when in New Mexico; and then a few
years ago, I got reading the online Spanish papers, particularly
elmundo.es and El Pais and so can read Spanish, particularly
Castilian, all right, but I can't speak it at all.
Regards! and again, thank you.
Barb
---------
"-Siempre que enseñes, enseña a la vez a dudar de lo que enseñes."
-- José Ortega y Gassett
I live in the West Coast of the US. I was wondering since you are
local of the Canaries, if you have reports of TREMORS, can you email
me and let me know ahead of time. Thank you. ASTEROIDJACQ...@xxxxxxxx
Ahead of what time?
Or is your ISP a certificate of incompetence?
(Yes I know that AOL used to provide a good service to those of us
outside the USA but one hears or used to hear stories.)
I believe the poster you asked information of lives in the USA too.
She likes to look at the seismogrammes available online. Something
that leaves me cold at the moment. I would rather look at a bag of
mushy peas and chips. (And remember the days we had real newspaper and
real salt and vinegar.)
A set up of such tremors if they are going to occur will usually
follow a
Let me see if I can remember....
Negative anomaly in one ocean and positive in the other, with the
state of the moon set to induce volcanic spells or would that be
tornadoes...
Can't remember....
Anyway look at the sea surface pressure charts for the North Pacific
and the North Atlantic, check the time of the lunar phase and compare
events similar to the one you are looking for.
HTH. (TIDIW,S.)
.
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