A new blog at All-geo: Volcan01010

A post by Chris RowanI’m very pleased to announce a new blog here at All-geo. Volcan01010 is written by volcanologist John Stevenson, a compatriot from my undergraduate days. You might recall his excellent posts during last years’ eruption of Eyjafjallajökull, which provided expert commentary on Icelandic volcanism and subglacial eruptions.

In his inaugural post on Volcan01010, John looks at the prospects for future eruptions in Iceland blowing disruptive volcanic ash clouds into European airspace, concluding that this probably isn’t the last time we’ll see it in our lifetimes.

…the take-home message is that this is not just a once-in-a-millenium, or even a once-per-century event. Consequently, it is something that we should be planning for and working hard to understand.

Please click over for the full details, and to welcome John to the geoblogosphere. As for the name of his blog, I obviously appreciate its tongue- and keyboard-twisting nature, but it also reflects John’s research interests – volcanoes (particularly Icelandic ones) and the computing tools that are becoming increasingly important to scientists for analysing, tracking and predicting volcanic activity. I’m looking forward to reading more about both in future posts.

Categories: bloggery, links, volcanoes

Stuff we linked to on Twitter last week

A post by Chris RowanA post by Anne JeffersonA light dose of linkage this week: for various reasons, both of your Highly Allochthonous bloggers found themselves distracted by the real world in the past few days. Normal tweeting and blogging service should resume shortly!

Blogs in motion

A few new blogs have been brought to our attention this week:

Volcanoes

Planets

Fossils

(Paleo)climate

Water

General Geology

Interesting Miscellaney

Categories: links

New at Erratics: more adventures in copper mineralisation

Nina Fitzgerald, our latest Earth Science Erratics contributor, continues and concludes her run of guest posts with two more articles on copper mineralisation. In the first, she explains the role of hydrothermal sulphide mineralisation in forming copper ore:

Still wondering about Cu?

In the finale, Nina covers alteration of ore minerals when exposed at the surface, provides some handsome ore hand specimen photography and provides some advice on what the novice copper prospector should look for:

Cu – The Finale

Head over and check them out. We’d like to thank Nina for her fascinating contribution to Earth Science Erratics, and we look forward to reading about her future adventures on her own blog, Watch For Rocks.

Categories: links, rocks & minerals

When snow doesn’t melt away like snow

A post by Chris RowanWhen you move to a new country, it’s always interesting to observe the differences in how places work. Sometimes, a shared problem is solved in a completely different way (for example, the South African approach to separating out recyclable material from household rubbish); and sometimes, the problems your new city is struggling to overcome are hardly a problem at all in the place where you came from. Such is the case with Chicago’s recent encounter with epic snow. In total, about 25 inches have fallen on the city in the past two weeks or so, and since temperatures remained some way below freezing until this weekend, it has just stayed there (indeed, I think there’s been some snow on the ground continuously since before Christmas). This is a far different experience than back in my British homeland. Not only is there far less snow to start with, but a few days after a couple of inches has ground the country to a standstill, it also usually gets warm enough at some point of the days that follow to fairly quickly turn the snow to slush and melt it away. Thus we Brits are not faced with the problem that faced Chicago: what do you do with all the snow you’re clearing from the roads, paths, and car parks? You can only plough so much out of the way before you start risking real damage to the things you’re ploughing it against.

Ploughed snow pushing against a fence. Photo: Chris Rowan, 2011.

It’s also a very bad idea to dump snow into waterways, despite the inviting proximity of the shores of Lake Michigan: you’d be dumping a concentrated dose of pollutants at the same time. Chicago’s solution was to load the snow onto trucks, drive it to flat, empty spaces, and dump it there, creating new landscapes of snowy spoil. In Hyde Park, the designated dumping point was an empty lot a couple of blocks away from my flat.

Where the snow cleared from Hyde Park ended up. Photo: Chris Rowan, 2011

Another view of the anthropogenic snow piles. Photo: Chris Rowan, 2011.

Morphologically, these mounds look like a bizarro-world version of the moraines that form at the end of glaciers, where the rock debris that they grind off and pick up are redeposited as the ice melts. It is certainly true that like glaciers, mankind’s trucks and lorries are rather indiscriminate about what they are sweeping up and redepositing elsewhere. As well as the pollutants previously mentioned, you could see dirt, sand and grit – and even some much larger clasts – within these snow piles.

An erratic in the making. Photo: Chris Rowan 2011.

Presumably, this is more a case of the redistribution of snow not working to everyone's advantage... Photo: Chris Rowan, 2011.

In the warmer temperatures we’re forecast for most of this week, these mounds, and the snow elsewhere, will finally start to melt away, which will bring on the next problem – negotiating the copious puddles that will result. Does anybody know the American for Wellington boots?

Categories: photos, society

Stuff we linked to on Twitter last week

Stuff we linked to on Twitter last week

A post by Chris RowanA post by Anne Jefferson

Earthquakes

Volcanoes

Planets

Fossils

(Paleo)climate

Water

Environmental

General Geology

Interesting Miscellaney

Categories: links