During the 1990s, a very subtle bulge grew on the west side of South Sister, near Bend in Oregon. It stopped growing by 2002, but now 20 years later, it has started growing again.
. That might not sound like much, but combine that with a few earthquake swarms in October 2021, December 2021, and January 2022 that could betray moving magma, and we got ourselves something to watch.
Map showing the renewed uplift at South Sister in Oregon since July 2021. Credit: US Geological Surveythinks anything will happen soon ... or at all. They have not changed the alert status from "Green", the lowest level. Even if this is magma moving, we have little clue to whether it is enough to cause an eruption ... or if any eruption could happen in the next few years or next few centuries.. At the turn of the century, it became clear that the volcano showed signs of a bulge.
The uplift at South Sister likely lasted from 1995-2001, but things settled down afterwards . The interpretation of this bulge was that . Models suggested that about 700 million cubic feet of magma may have intruded. That might sound like a lot, but it is actually a fairly small volume of magma.The location of the "bulge" is notable because Three Sisters is kind of a nexus of different types of volcanism. There are the three composite volcanoes that have erupted everything from basalt, basaltic andesite, andesite, dacite and rhyolite.
The basaltic lava flows of Belknap Crater in the foreground with North Sister hiding underneath clouds in the background.
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