Федеральное государственное бюджетное учреждение науки
Геологический институт им. Н.Л. Добрецова
Сибирского Отделения Российской академии наук
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Мир Бурятия "Гравитация науки: Геологический институт БНЦ СО РАН"
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Volcano Geodesy 101 [Green Gabbro] [2009-01-07] Rob R. asks:
I've been following along with the recent happenings at Yellowstone (that is, as best as I can as a layman) but haven't seen that site [data from the Yellowstone GPS network] before. Could you explain (or link to) what I'm seeing there and what a 'change in surface topography' might look like? Thanks in advance.
Sure thing! What you are looking at on that page is a network of GPS receivers cemented to various points in the Yellowstone caldera and surrounding area. The USGS has written a nice overview of GPS and other geodetic volcano monitoring techniques, and I won't duplicate their efforts here.
The instrument in this photo is the GPS station from White Lake, Wyoming. For the past several years, it's been moving upwards at a rate of about 4 cm/yr - if it keeps going, which it obviously won't, it would take about 10 billion years to get to the moon.
This is the cartoon version of what it is looking for:
It's not just an expanding magma chamber that will produce this kind of surface change, though. You can also use long-term GPS series (and other types of survey data) to see ground water levels going up and down, the crust gradually relaxing after an earthquake, and the slow creep of plate tectonics.
Read the rest of this post... | Read the comments on this post... scienceblogs.com
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