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South Sister volcano eruptions
complex volcano 3157 m / 10,357 ft
Oregon, 44.1°N / -121.77°W
Eruption list: 1853 (?), 2000 years ago
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.