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GulberwickWeather

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    General Volcanic Activity Thread!

    in Space, Science & nature

    Posted · Edited by GWW

    AVCAN are saying that the earthquakes are expected to become stronger in the coming hours and that they are moving more towards the interior of the island. The Red Alert/evacuation at the moment only applies to the southern part of the island around La Restinga but this could change.

    As you can see from the plot the quakes from 2 days ago are in green, the quakes from yesterday are in red/orange and todays are in blue - shows a migration towards the main island. The most recent quakes have a mag of 2.7 and 2.4

    http://www.avcan.org/mapas/AVCAN1363.jpg?d=1318351247

    General Volcanic Activity Thread!

    in Space, Science & nature

    Posted

    There seems to have been a step-change in this eruption since about 6am this morning. Notice from the spectral plot and indeed the webicorder trace how everything got more intense from then. Also note the yellow streaks going from bottom top, those are earthquakes. Notice how before 6am they were only getting about 2/3 the way across the plot, now they are right to the top.

    http://www.01.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2011-10-11&ver=s&estacion=CHIE&Anio=2011&Mes=10&Dia=11&tipo=2

    General Volcanic Activity Thread!

    in Space, Science & nature

    Posted · Edited by GWW

    Check out this graph from IGN (Instituto Geofisical Nacional) from the webicorder on El Hierro. As you can see at the very top the webicorder trace is now almost a solid blue line indicating that the amplitude is such that the signal is being 'clipped' to prevent it scrawling all over the graph. More worryingly look at the table below which shows the frequency range of the tremors. As you can see they start more in the 'narrow band' 2-3 Hz range, which can be indicative of a VEI2 eruption, but they seem to be more and more in the 4-6Hz 'broadband' range now which could be indicative of a VEI3-4 eruption.

    http://www.01.ign.es...0&Dia=11&tipo=2

    Heres a piece which describes how the frequency of the quake signal can relate to the VEI - thanks to Andy Scollick over at Eruptions for this:

    http://img51.imageshack.us/img51/4219/tremoresmodelo2.jpg

    General Volcanic Activity Thread!

    in Space, Science & nature

    Posted · Edited by GWW

    Indeed. It does look like somethings building. The trace on the webicorder has got to the point where its being 'clipped'.

    Media report on the evacuation of La Restinga states Alert Level now at 'Red'

    http://www.diariodea...cua-la-restinga

    According to the babelfish translation the population of La Restinga have been told to report to the football ground to prepare for evacuation.

    7th October 2011 Weather And General Chat

    in Weather reports

    Posted · Edited by GWW

    Has it snowed this Autumn where you are. If not, you could be in for a bit of luck with perhaps some snow tonight.

    Not yet no. We normally get our first snow during the last week of October but yes its looking like theres a chance of some sleet/wet snow later tonight perhaps. DP is falling all the time, down to 3.2C now.

    7th October 2011 Weather And General Chat

    in Weather reports

    Posted

    Chilly & breezy with occasional blustery and occasionally wintry showers.

    Current conditions @ 1123 BST

    Temp: 8.5C

    Dew: 4.1C

    Wind Chill: 4.3C

    Humidity: 74%

    Wind: NNW @ 13.4kts

    Gust: 30.4kts

    Rainfall: 0.0mm

    Pressure: 1008.57hPa (rising)

    Interesting later on as we see the 528DAM line just over Shetland, upper air temps at around -5 to -6 and the 0 deg isotherm between 700 & 800 ft.

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