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Volcanoes and earthquakes make Russia even bigger 17 November 2009

Posted by admin in Russia, Sarychev Peak.
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Already the largest country on the planet, Russia has become even bigger over the past couple of years thanks to the workings of plate tectonics in the Russian Far East. Sakhalin Island was struck by earthquakes on 2 August 2007 (some pictures  here) which added ~3 square kilometers of new territory through uplift, while lava flows from the Sarychev Peak eruption of June 2009 (stunning image here) enlarged Matua Island in the Russian Kurils by 1.5 square kilometres.

The appearance of new land through volcanism has caused international tension in the past, but fortunately there are no such complications this time.

The Volcanism Blog


Earth on Fire 17 November 2009

Posted by admin in volcanoes.
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Those nice people at Seed Magazine dropped me a line at the weekend to let me know about a slideshow they have just published featuring seven of the spectacular images from Bernhard Edmaier’s new book Earth on Fire, published by Phaidon. On this evidence the combination of beautiful pictures and serious geology in Earth on Fire is irresistible. So, if you have been racking your brains to think of a suitable Christmas present for, say, a favourite volcano blogger…

Click here for the Earth on Fire slideshow – and there’s a great collection of other slideshows at Seed Magazine, by the way, along with much else.

The Volcanism Blog

Galeras update, 17 November 2009 17 November 2009

Posted by admin in activity reports, Colombia, Galeras.
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Galeras - image from INGEOMINAS/FAC overflight, 14 November 2009 (copyright INGEOMINAS)
The summit crater at Galeras: image from INGEOMINAS overflight, 14 November 2009 (copyright INGEOMINAS).

Colombia’s Galeras volcano remains at the second-highest level of Orange, ‘eruption likely within the next few days or weeks’. The most recent bulletin, issued on 10 November 2009, reports ‘a notable decline in the number and energy of recorded earthquakes’, with most seismic activity being associated with a combination of rock fracturing and fluid movement quakes.

The majority of the earthquakes recorded have been located in the environs of the summit crater, at depths of less than 2 km and with magnitudes of less than 2. The bulletin highlights the occurrence of ‘some’ tornillo earthquakes (long- period seismic events typically associated with pressurized fluid movements at shallow depth), noting that such events were detected during the run-up to earlier eruptions of Galeras during the period 1993-9.

No sulphur dioxide emissions have been recorded during the week 4-10 November, ‘which reflects a sealed system preventing the release of this type of gas to the atmosphere’.

The bulletin concludes by underlining that the present behaviour of Galeras ‘is similar to that recorded in the stages preceding some of the eruptive events which have taken place during the last twenty years’.

A new Galeras bulletin is due to be released by INGEOMINAS today (17 November). An overflight took place on 14 November, and the new bulletin should contain observations from that flight. In the meantime a number of photographs taken during that overflight of the summit area of the volcano (including that reproduced above) are available on the Pasto observatory website.

For all our Galeras coverage: Galeras « The Volcanism Blog.

Global Volcanism Program – Galeras – summary information for Galeras (1501-08=)
Portal Corporativo de INGEOMINAS – Instituto Colombiano de Geología y Minería
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page

The Volcanism Blog