MICHAEL MANGA

Neat stuff in the Field

Chile, 2018

The volcanic field at Laguna del Maule on the Chile-Argentina border contains 36 post-glacial domes and coulees, with total erupted volume of 40-50 cubic kilometers. There were at least another 29 explosive eruptions during this time. Recent and large uplift raises many questions: what causes the uplift? is there reason to expect a new eruption? why does the magma erupt around the lake? what is the origin of the compositional diversity? These and more questions were discussed in January 2018 at the AGU Chapman conference on merging geophysics, petrochronologic and modeling perspectives of large silicic magma systems.


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Laguna del Maule

Following earthquakes, there can be a variety of responses in hydrological systems. One of the easiest to observe and quantify is an increase in stream discharge. Chile is an ideal location to study such responses and test hypotheses because there are lots of stream gauges and lots of large earthquakes. The Claro River at Siete Tazas (below) dried up after the 2010 Maule earthquake. Further downstream, discharge increased. Mohr et al. (2018) show that these observations can be explained by an increase in permeability produced by the passage of seismic waves.


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Siete Tazas (field trip led by Carolina Munoz-Saez).


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