San Pedro volcano
stratovolcano 6145 m / 20,161 ft
Northern Chile, Bolivia and Argentina, South America, -21.88°S / -68.4°W
Current status: dormant (1 out of 5) | Reports
San Pedro volcano books
Northern Chile, Bolivia and Argentina, South America, -21.88°S / -68.4°W
Current status: dormant (1 out of 5) | Reports
San Pedro volcano books
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Typical eruption style: explosive and effusive
San Pedro volcano eruptions: 1960(?), 1938, 1923(?), 1917(?), 1916(?), 1911, 1901, 1891(?), 1877(?), 1870(?)
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San Pedro volcano eruptions: 1960(?), 1938, 1923(?), 1917(?), 1916(?), 1911, 1901, 1891(?), 1877(?), 1870(?)
| Time | Mag. / Depth | Distance | Location |
| Tue, 19 Jun | |||
| Tue, 19 Jun 07:33 UTC | M 3.1 / 134.6 km | 32 km | 37 km al SO de Ollagüe |
| Mon, 18 Jun | |||
| Mon, 18 Jun 18:22 UTC | M 2.8 / 103 km | 32 km | 56 km al NE de Calama |
| Mon, 18 Jun 16:38 UTC | M 3.3 / 130 km | 33 km | 41 km al SO de Ollagüe |
| Sat, 16 Jun | |||
| Sat, 16 Jun 02:02 UTC | M 2.5 / 105.1 km | 44 km | 39 km al NE de Calama |
| Fri, 15 Jun | |||
| Fri, 15 Jun 14:10 UTC | M 2.9 / 101.9 km | 22 km | 72 km al SO de Ollagüe |
San Pedro volcano is a twin volcano with 2 peaks, San Pedro (the western summit) and the older sister volcano San Pablo (6092 m) in the east.
A large debris avalanche, similar to the one at Mt St Helend in 1980, occurred at San Pedro in the past, and the present-day cone grew within the depression. The debris avalanche deposit is visible on the western lower slopes of San Pedro.
Thick dacitic lava flows with steep-sided fronts cover the upper slopes of San Pedro's cone which has a crater. There is a young-looking scoria cone on the western flank (La Poruña), which erupted an 8 km-long lava flow about 103,000 years ago.
Reports of varying degrees of reliability have recorded a number of eruptions in the past centuries.
Note: a volcano with the same name is at Lake Atitlán in the Guatemalan Highlands, forming the prominent group of San Pedro, Tolimán, and Atitlán volcanoes.
San Pedro Photos:
 Atitlán, Toliman, and San Pedro volcanoes (Photo: Tom Pfeiffer) |  Early morning at the shore of Lake Atitlán with Atitlán, Toliman and San Pedro volcanoes in the background (Photo: Tom Pfeiffer) |
 Sunrise above the Lake Atitlán with Atitlán, Toliman and San Pedro volcanoes behind (Photo: Tom Pfeiffer) |
 16Guat012012YC.jpg (Photo: Yashmin Chebli) |  Lake Atitlan with Toliman, Atitlan and San Pedro volcanoes (Guatemala) (Photo: Yashmin Chebli) |  82Guat012012YC.jpg (Photo: Yashmin Chebli) |
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