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 |
| Sat, 21 Apr | |||
| Sat, 21 Apr 13:13 UTC | M 2.6 / 128.2 km | 12 km | 73 km al NE de Calama |
| Sat, 21 Apr 05:03 UTC | M 4.0 / 109.4 km | 27 km | 59 km al NE de Calama |
| Sat, 21 Apr 03:33 UTC | M 2.5 / 92.8 km | 32 km | 54 km al NE de Calama |
| Fri, 20 Apr | |||
| Fri, 20 Apr 15:17 UTC | M 2.6 / 117.2 km | 16 km | 59 km al S de Ollagüe |
| Thu, 19 Apr | |||
| Thu, 19 Apr 15:36 UTC | M 2.5 / 118.7 km | 4 km | 77 km al S 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) |
 Wonderful electric wiring in Santiago Atitlán (San Pedro volcano in the background)... (Photo: Tom Pfeiffer) |  The summit of San Pedro volcano in the early morning light (Photo: Tom Pfeiffer) |  View across the Atitlán Lake towards Atitlán, Toliman and San Pedro volcanoes (Photo: Tom Pfeiffer) |
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