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San Cristobal volcano
stratovolcano 1745 m / 5,725 ft
Nicaragua, 12.7°N / -87°W
Current status: normal or dormant (1 out of 5)
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San Cristobal volcano eruptions:
2016, 2015, 2012, 2010-11, 2010, 2009, 2008 (Nov), 2008 (Aug), 2007, 2005-06, 2003-04, 2002, 2001, 2000, 1999-2000, 1997,1987 (?), 1985 (?), 1977, 1976 (Aug), 1976 (Mar), 1971, 1685, 1684, 1680, 1613 (?), 1528 ± 1 year
Typical eruption style:
explosive
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San Cristobal volcano news & activity updates

San Cristobal volcano (Nicaragua) eruption update: near continuous ash eruptions, evacuations

Thursday Dec 27, 2012 11:05 AM | BY: T

Ash emission from San Cristobal (image: SINAPRED)
Ash emission from San Cristobal (image: SINAPRED)
Seismic recording second half of yesterday GMT time (CRIN station)
Seismic recording second half of yesterday GMT time (CRIN station)
The series of small ash explosions starting on 25 Dec at around 20h00 local time continued throughout the night and increased in intensity during the morning of 26 Dec. Activity decreased around noon yesterday, but resumed again in the afternoon with 4 more explosions between 13:25 - 16:11 h local time at intervals of 20-60 minutes, accompanied by strong pulses of tremor.
More ash emissions and explosions have followed and are at times near continuous. The height of the ash columns is reported to be about 500-800 m above the crater. VAAC Washington was able to observe the ash plumes on satellite and issued warnings about ash plumes at 14,000 (4.2 km) altitude.
Light (few mm) ash fall has occurred in up to 6 km distance from the volcano including in several inhabited areas located mainly NW, W, SW and S of the volcano, namely in El Viejo, Grecia No. 1 and 4, Las Rojas, Banderas, and Abraham Rugama.
INETER recommends to the population to protect the water supply sources and children in particular from inhaling ash, and has demanded air traffic control to deviate flight paths in the area.
The Nicaraguan president has declared orange alert for the departement of Chinandega and authorized the preventive measure to evacuate families living within 3 km radius from the volcano. More than 200 families were reported to have auto-evacuated out of fear the eruption might intensify.
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Links / Sources:
Previous news
This morning's seismic signal (CRIN station, INETER) showing continuous tremor
Wednesday, Dec 26, 2012
New eruptive activity has been reported from San Cristobal volcano in Nicaragua. It appears that small ash emissions started late in the evening of 25 Dec (local time). Plumes reach 8,000 ft (2.4 km) altitude VAAC Washington reports. ... [more]
Seismogram nn 19 Dec 2012 at CRIN station (INETER)
Wednesday, Dec 19, 2012
Banded volcanic tremor has reappeared on the seismic recording. [more]
Tremor signals on seismic recording on 14 Nov (CRIN station, INETER)
Thursday, Nov 15, 2012
Some tremor has been appearing periodically on the seismic recordings from San Cristobal in recent days. [more]
Current seismogram from San Cristobal (CRIN station, INETER)
Wednesday, Oct 03, 2012
Earthquakes and long-period events are frequent on the seismic recording, but there are no reports of new activity. [more]
Current seismic signal from CRIN station (INETER)
Tuesday, Sep 25, 2012
Seismic activity at the volcano seems to be decreasing, although a few earthquakes still occur. INETER has not published any reports since 16 Sep, suggesting that not much activity is happening. [more]

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