This all started when I noticed a strange spectrograph signature at the La Palma station, while I was looking at spectrograms from the recent
seismicity at El Hierro. THat will end up being the LAST pic I post in this thread- cause I want to take you chronologically through the events that I
have discovered. Note: This thread may take a while to load with all the pics.
By now I think most of us know the difference between those two- for the major threat to many countries from a mega tsunami comes from La Palma, not
El Hierro- if the west side of the volcano collapses- which has already started. This has been well documented, and please do some searches if you
need to about it.
But my main concern right now is that I believe I may have detected several episodes of lower amplitude volcanic tremor at La Palma, which I have
painstakingly gone back and traced, day by day, to have started- I believe- on October 28th, 2012. I will carefully differentiate each event with a
corresponding spectrograph from the station at El Hierro, to show that these events are not originating from the substantial seismicity there. I
believe they are local to La Palma, but I am happy to entertain your thoughts on why I may be wrong on that.
I went all the way back to June 1, 2012, day by day, so if anything happened before that, I don't know. Believe me, that was enough work in itself to
go that far back. But the current tremor events at La Palma began with the following event on October 28, 2012:
And here is the waveform view, with an arrow I have placed to show where this event began:
And to show that this did not come from El Hierro:
So the following pics will all be laid out like this- 1) Spectrograph of the event at La Palma, 2) Waveform view with arrow, marking start time and 3)
the corresponding spectrograph from the station at El Hierro, to show that the event did not originate from there. So get used to the 1,2,3.
October 30, 2012:
October 31, 2012:
November 1, 2012:
Now here is where I got concerned enough to want to start this thread, because this next tremor sequence ramps up the power considerably. This is the
March 3, 2013 sequence:
Look at that!
And in this case, it was possibly strong enough to propagate some 60 km all the way to El Hierro, if that's what we are seeing there!
And here is the event that got me started looking at this- it is a strange low frequency event on March 22, 2013, just a few days ago:
That again, does not appear to come from El Hierro!
So in closing, yeah, I'd say we better damn well keep an eye on that beast in case this escalates further, because it seems the tremor episodes have
been ramping up in power. Now even if an eruption does happen at La Palma, it doesn't mean necessarily that the side of the volcano is coming down,
causing the massive tsunami to hit the east coast of the USA. But if it does erupt, I have no doubt it is going to make one hell of a lot of people
nervous as crap, including me.
It is confusing watching La Palma also register the stronger seismicity from El Hierro. But hopefully I think I have shown through pulling the
corresponding El Hierro charts per each date, that these particular events are coming from somewhere at La Palma, not El Hierro- or darn close to La
Palma. Hopefully at least some professionals will at least take heed, and perhaps research this further. Cause I am done for now- but you better
believe I have my eyes glued to the charts at the IGN.
EDIT: For recent seismicity at El Hierro, also see this good thread started by Olivine:
edit on Mon Mar 25th 2013 by TrueAmerican because: (no reason given)