Amealco
Amealco is another large rhyolitic caldera complex. Gerardo
Sanchez-Rubio has determined that the caldera is 11 km wide and 400 m deep.
With dimensions like this, combined with the fact that it is old and eroded,
it is not a very obvious structure, and perhaps this is why it hasn't been
studied very much. It is truly impressive, however, when you consider the
great sheets of pyroclastic flow deposits (called ignimbrites) that slope
gently away from the caldera. These ignimbrites are in places more than 200
m thick, they cover at least 1600 square kilometers, and have a volume of
about 500 cubic kilometers. Good thing Amealco erupted a long time ago!
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