http://news.yahoo.com/earthquake-causes-river-disappear-costa-rica-200100966.html<snip>
Following a series of moderate earthquakes that struck the country Tuesday, residents around the Guacalito River in Costa Rica discovered that the river had disappeared. Earthquake-report.com reported that sometime after the earthquakes, villagers living near the river, which is located near Armenia de Upala, discovered that the river was dry.
It was not immediately known if the waters of the river had disappeared due to sinkhole activity that can occur after earthquakes or if the earth shaking caused damming that dried up the river near the Miravalles volcano. The quakes were centered near the Nicaragua and Costa Rica border in the same vicinity as the Miravalles volcano.
An entire body of water disappears? Strange but true, and this isn't the first time this odd event has happened.
In 2010, the Iska River in Slovenia disappeared after local residents heard loud crashing and banging overnight. The next morning, the river was dry and the riverbed was full of fish and other creatures. It was believed that the waters of the river had drained through a large crack into an underground riverbed. This disappearance was not believed to have been related to an earthquake.
In 1959, the largest earthquake to strike Montana -- a 7.3 magnitude temblor -- caused a landslide to dam the Madison River just below Hebgen Dam, thus creating a new body of water that became Hebgen Dam, or "Quake Lake."
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never heard about the Montana quake
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