And yet somehow we knew it was going to erupt without spending $140m.
Heh.
Well, yes -- but we have a good number of volcanoes around that aren't being watched well. Since St. Helens shocked the volcano world by revealing that the one magma chamber, one volcano scenario wasn't the nice tidy reality everyone thought it was, a lot of things have been re-evaluated, and among those has been that a good number of volcanoes once rated as extinct have been recategorized as dormant -- which means they need watching. Besides that, there are volcanoes that are woefully sub-monitored; Rainier is one, a mountain which could potentially kill millions if it did a burst/cataclysmic eruption -- towns are actually growing right up its flanks, and the only way evacuation can be done well and efficiently is if there is clear, definite warning (the last time I talked with a geologist who dealt with Rainier, they had a wish list of about $15 million for monitoring for that mountain alone!).
And the truth is that we don't know enough yet. Most predictions of eruptions are in a form much like weather forecasts here in the Pacific Northwest: like, 60% chance of precipitation, which could mean we might get rain most of the day, might have some brief showers, could get hail, or might see nothing at all. That's not definite enough for politicians to be willing to order people to evacuate -- and if they put their money on the 40% chance of nothing at all, and it turns out to be the extreme other end with violence that kills people, it isn't just their careers that will be hurt.
On the local news here in Seattle -- they mentioned that several pilots said the advanced warning very possibly saved their lives -- since they were routed AROUND it instead of OVER it...
Volcanic ash and Jet engines don't mix well...


Not just jet engines -- when St. Helens erupted, and scattered ash around the world, the larger ash particles (still not as big as sand grains) ruined car engines, air conditioners, lawn mowers, even bicycle pedal bearings. Basically, anything with moving parts that isn't sufficiently sealed against near-microscopic grit is at risk from volcanic ash -- the degree of risk depending on the type of volcano and type of eruption.
And that latter is another good reason for monitoring: we know that some volcanoes can erupt in more than one way, and it would be very helpful to know what sort of eruption is coming, so preparations can be made. If a mountain is going to shove out blobs of semi-molten material (sort of like the earth taking a dump), there's usually not much need for any evacuation; if it's just going to be ash and cinder, evacuation and other needs will depend on the weather (some St. Helens ash fell on ships 500 km west of Oregon in one eruption; in a few places it rained mud when ash mixed with clouds -- and some of that rain wouldn't have occurred had there not been the ash!), and if there could be pyroclastic flows (think a tidal wave of dust and grit hot enough to melt the windows of your house on contact, even as it's setting the walls on fire), people need to move
NOW, because those buggers can rip down a slope and across the land at better than 150 kph.
Also interesting to this story is that the $140 million includes more than volcano monitoring …
What is rather ironic about Governor Jindal’s complaint is that some of the stimulus money will be expended for US Geological Survey equipment used to measure rising river waters and storm surges – quite likely deployed to areas of coastal Louisiana. [
Link]
Trivia time: flow meters are also used for volcano monitoring. When a volcano is a mountain with glaciers, no warming may appear on heat sensors, because the ice has a cooling effect -- but the glacial ice can be melting from underneath, and a sudden surge in flow (apart from heavy precipitation) from glacial streams can mean it's getting hot under there (ice underneath a glacier can melt and accumulate until it finds a way out).
Sudden flows like that can also precede sudden rushes of glaciers downhill... an event that is possible as a precursor to an eruption.
One thing I learned from volcanology at OSU was that volcanoes are scary critters. If I were a billionaire, I'd be easily persuaded to write checks for improved monitoring anywhere people I know live -- which would cover about every volcano in the lower 48.