Author Archives: John A. Stevenson

Ash cloud travel insurance / why scientists should blog

I was quoted on the Daily Telegraph website at the weekend, in an article about the number of travel insurance companies whose policies cover volcanic ash.  I’d answered some questions from the author by email, then he told me when … Continue reading

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EGU2013: Dirty volcanic hail, geology blogging, open source science and fracking

Here are some of my highlights from last week’s European Geoscience Union conference.  These were presentations dirty hailstones formed in subglacial volcanic eruptions, a workshop on social media and blogging in geosciences, a splinter meeting on open source software in … Continue reading

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Two years of volcan01010: Highlights of 2012

This week is the second anniversary of volcan01010.  With this post, I want to give an overview of what I have been writing about over the past year.  If you are new to the blog, then it should give you … Continue reading

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Processing ARSF remote sensing data with open source GIS tools

The UK National Environment Research Council’s Airborne Research and Survey Facility (NERC ARSF) is an aircraft used for scientific research. The on-board instruments include LiDAR, high resolution camera, and multispectral and hyperspectral infrared scanners.  The aim of this post is … Continue reading

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Gas, not ice, makes subglacial rhyolite explode

A recent study by Jacqui Owen (Lancaster University), Hugh Tuffen and Dave McGarvie shows that the explosivity of a subglacial rhyolite eruption is determined while the magma is still deep beneath the ground. Rhyolite is a particularly thick and gloopy … Continue reading

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UK Environment Advisor’s talk on climate change

If you are in any doubt that climate change is the biggest issue of our time, then I highly recommend watching the talk given by Prof Robert Watson, the former Chief Scientific Advisor to the UK’s Department for Environment, Food … Continue reading

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Easily change coordinate projection systems in Python with pyproj

Python is an easy-to-use programming language which, thanks to a growing number of cool extension modules, is really taking off in the world of scientific data handling.  The Proj4 libraries are a set of programs for performing coordinate system transformations.  … Continue reading

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A visual estimate of the proportions of mixtures: pumice vs. lithics

When a volcano erupts explosively, the tephra that comes out is a mixture of material that was molten at the time and bits of other old, cold rock that happened to get caught up in the blast.  These are referred … Continue reading

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Ten swimming pools of travel chaos

An article published this week reveals the volume, grainsize and eruption rate characteristics of the tephra (volcanic ash, pumice and other materials) erupted during the eruption of Eyjafjallajökull in 2010.  This information is important because these are the inputs needed … Continue reading

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Iceland horse fun

Ever the practical joker, Dobbin thought it would be hilarious to rohypnol the water trough…

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