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Eyjafjallajokull: enhanced tremors responses
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From: Dornadula Chandrasekharam <dchandra50@xxxxxxxxx>
Enhanced tremors mean that the volcano is still active and can expect
contnued eruption in the next coming days.
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From: David Little <iki@xxxxxxxxxxxxx>
Is there any way we can see a seismogram?
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From: Willy Aspinall <Willy.Aspinall@xxxxxxxxxxxxx>
Alan's question about enhanced tremor amplitudes (with reduced eruptive flux) can be extended to ask about the low frequency of the dominant tremor from the outset, reported by IES as 0.5Hz (2 sec period).
This is a rather low dominant frequency for eruptive (shallow?) tremor and, physically, seems to imply a spatially extended source. There are models which indicate how low frequency tremor might be excited in magmatic systems: e.g. Neuberg, J., R. Luckett, et al. (2000). Models of tremor and low-frequency earthquake swarms on Montserrat. Journal of Volcanology and Geothermal Research 101: 83-104. An analysis of the present case could be very informative for hazard assessment.
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