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Andes Uplift

20 December 2015

At http://phys.org/print369561139.html … an interesting study of a massive volcanic field in the Andes that reveals a surprising amount of uplift in a short time scale, as much as 6 feet in the last 8 years. Apparently, this has occurred many times over the last 10,000 years of the Holocene.

A clearly defined lake shore  can be seen 600 feet above the current lake level that must have been horizontal when formed around a thousand years ago. Since then the southern end of the lake shore has risen 220 feet in altitude – and similar behaviour can be seen over longer periods of time.

Brad Singer has spent 20 years studying volcanoes in Chile and he blames upwelling magma chambers for the uplift, the lava hardening into domes. The research was presented at the December AGU meeting in San Francisco. The lake basin is dominated by massive and repeated lava flows and earthquakes. In the past 12 months 3 volcanoes have erupted.

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