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Thu, Oct 13 2011 16:44:09

October 12th 14:30 event at El Hierro

Five geologist & scientists: @rschott @nchazarra @pabloj_gonzalez @Lumifg & @teideano from America and Spain talking about El Hierro the very same day the second? event toke place. Network thinking.

  1. rschott
    48 hrs & the volcanic tremor @ El Hierro is still going strong: http://t.co/g3jVhlY9 That's a lot of magma on the move. When will it emerge?
    rschott
    Wed, Oct 12 2011 00:24:51
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  2. nchazarra
    @Lumifg @rschott The situation seems very static, but it has been recorded a 2.6 earthquake one hour ago
    nchazarra
    Wed, Oct 12 2011 05:45:02
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  3. rschott
    @nchazarra @Lumifg It seems remarkable that none of the quakes recorded in the last two days are shallower than 10km: http://t.co/0l9Jvj5h
    rschott
    Wed, Oct 12 2011 06:56:39
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  4. Lumifg
    @nchazarra @rschott perhaps the volcanic tremor is covering up the detection of any other shallower quake.
    Lumifg
    Wed, Oct 12 2011 07:07:51
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  5. nchazarra
    @Lumifg @rschott Yes, that is a possible scenario, and that makes more important the decision of using a good seismic array to locate quakes
    nchazarra
    Wed, Oct 12 2011 07:13:52
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  6. pabloj_gonzalez
    Abrupt decrease of tremor amplitude in El Hierro. I mean really abrupt!! http://t.co/mkjbU24Z
    pabloj_gonzalez
    Wed, Oct 12 2011 11:11:12
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  7. pabloj_gonzalez
    Given that prior to reduction, an increase in higher frequencies occurred. Explosive events couldn't discarded. http://t.co/mkjbU24Z
    pabloj_gonzalez
    Wed, Oct 12 2011 11:13:35
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  8. nchazarra
    @pabloj_gonzalez Yeah, it's really a very abrupt change. Those higher frequencies could be from a great pressure release!
    nchazarra
    Wed, Oct 12 2011 11:19:44
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  9. rschott
    .@pabloj_gonzalez I agree. It looks like something changed rather dramatically. What's the word on the ground @teideano?
    rschott
    Wed, Oct 12 2011 11:20:24
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  10. pabloj_gonzalez
    @rschott @teideano We hope our man on ground. Could inform us. It could be a key point in the evolution of the volcanic phenomena.
    pabloj_gonzalez
    Wed, Oct 12 2011 11:22:17
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  11. rschott
    @nchazarra I think you may have hit the nail on the head. Not my area of expertise, but I like your explanation of abrupt frequency change.
    rschott
    Wed, Oct 12 2011 11:30:47
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  12. nchazarra
    @rschott Now it seems that after the pressure release, has been a increase again on the tremor, but looks quite steady...
    nchazarra
    Wed, Oct 12 2011 11:31:59
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  13. Lumifg
    @nchazarra @rschott @pabloj_gonzalez I almost miss the gig. These changes are out of my league, not an expert.
    Lumifg
    Wed, Oct 12 2011 11:38:43
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  14. nchazarra
    @Lumifg @rschott @pabloj_gonzalez We've just got back to low frequency and amplitude tremor. Let's keep watching the seismogram
    nchazarra
    Wed, Oct 12 2011 11:41:59
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  15. Lumifg
    @nchazarra @rschott @pabloj_gonzalez what happened with the PSD graph in espec. 15-16h ??
    Lumifg
    Wed, Oct 12 2011 11:45:35
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  16. pabloj_gonzalez
    @Lumifg @nchazarra @rschott Too few data in the Fast Fourier Transform data window, so it's output the PSD freaks out.
    pabloj_gonzalez
    Wed, Oct 12 2011 11:47:21
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  17. nchazarra
    @Lumifg @rschott @pabloj_gonzalez Some data is yet to come, let's wait for the next release of seismic and frequencies
    nchazarra
    Wed, Oct 12 2011 11:48:15
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  18. pabloj_gonzalez
    @rschott Yes, I agree. @teideano also commented 2 days ago about the lack of shallow events.
    pabloj_gonzalez
    Wed, Oct 12 2011 11:48:16
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  19. nchazarra
    @pabloj_gonzalez @Lumifg @rschott There is a total lack of shallow eartquakes,maybe we are only watching the filling and ascent of a chamber
    nchazarra
    Wed, Oct 12 2011 11:49:39
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  20. pabloj_gonzalez
    @nchazarra @Lumifg @rschott Young volcanic islands (La Palma, Fogo, El Hierro) lack of shallow magma chamber (many papers discussed it)
    pabloj_gonzalez
    Wed, Oct 12 2011 11:50:55
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  21. nchazarra
    @pabloj_gonzalez @Lumifg @rschott If we plot the points of the seismic swarm, it depicts something like a chamber between 9 and 18 km deep
    nchazarra
    Wed, Oct 12 2011 11:52:17
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  22. rschott
    @pabloj_gonzalez Maybe no shallow magma chamber but magma still has to break conduit to the surface to erupt-no evidence it's done that yet.
    rschott
    Wed, Oct 12 2011 11:54:12
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  23. Lumifg
    @nchazarra @pabloj_gonzalez @rschott therefore no shallow chamber and the tremor started when the magma moved upwards massively. Likely?
    Lumifg
    Wed, Oct 12 2011 11:56:27
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  24. nchazarra
    @Lumifg @pabloj_gonzalez @rschott Yeah, that's likely, and now the pressure is increasing again due to a lack of conduit
    nchazarra
    Wed, Oct 12 2011 11:58:54
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  25. Lumifg
    @nchazarra @pabloj_gonzalez @rschott almost an hour and the tremor signal hasn't recovered its amplitude http://t.co/TqPdzDju
    Lumifg
    Wed, Oct 12 2011 12:00:22
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