San Pedro volcano
stratovolcano 6145 m / 20,161 ft
Northern Chile, Bolivia and Argentina, South America, -21.88°S / -68.4°W
Current status: normal or 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: normal or 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, 21 May 2019 | |||
| Tue, 21 May 02:16 UTC | M 3.7 / 121.4 km | 44 km | 40 km al NE de Calama (Chile) |
| Mon, 20 May 2019 | |||
| Mon, 20 May 08:59 UTC | M 3.4 / 111 km | 39 km | 52 km al NE de Calama (Chile) |
| Mon, 20 May 04:04 UTC | M 2.7 / 114.6 km | 33 km | 54 km al SO de Ollagüe (Chile) |
| Mon, 20 May 03:51 UTC | M 2.5 / 119.2 km | 38 km | 48 km al NE de Calama (Chile) |
| Sun, 19 May 2019 | |||
| Sun, 19 May 19:29 UTC | M 2.5 / 108.1 km | 34 km | 52 km al NE de Calama (Chile) |
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) |
 The caldera of Laka Atitlán, Guatemala, in the morning. San Pedro, Atitlán and Toliman volcanoes in the background. (Photo: Tom Pfeiffer) |  Volcano San Pedro at Atitlan Caldera Lake sunset, Guatemala (Photo: WNomad) | 
Volcanoes Toliman, Atitlan and San Pedro at Atitlan Lake, Panajachel, Guatemala (Photo: WNomad) |
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