South Sister volcano eruptions
complex volcano 3157 m / 10,357 ft
Oregon, 44.1°N / -121.77°W
Eruption list: 1853 (?), 2000 years ago
March 2004 seismic swarm
On 23-24 March 2004, a seismic swarm with ca. 1000 earthquakes within 48 hours occurred in the same area that had been experiencing uplift.
Satellite radar interferometry (InSAR) data from the USGS detected continuing slight uplift of a broad region centered 5 km west of South Sister volcano that began in 1997.
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