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Fotos al azar
San Cristobal volcano
estratovolcán 1745 m / 5,725 ft
Nicaragua, 12.7°N / -87°W
Current status: normal or dormant (1 out of 5)
San Cristobal webcams / datos en tiempo real | Reports
San Cristobal volcano books
Erupciones del volcán San Cristobal:
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
Últimos terremotos cercanos
Latest satellite images
 

Eruption of San Cristobal volcano, Nicaragua, 8 Sep 2012 - updates

Volcano quiet for the moment
Update Mon 10 Sep 10:34
Current seismic signal from San Cristobal
Current seismic signal from San Cristobal
INETER has published a new statement and summary of the eruption last night, which is translated below. At the moment, no reports of new ash emissions are present and the seismic signal looks rather quiet as well. As INETER mentions, explosions could resume, as an elevated SO2 output suggests that more magma is under way.

Volcán San Cristóbal (Nicaragua) ha entrado en una relativa calma

Monday Sep 10, 2012 08:14 AM | POR: T
Ceniza caída mapa de la erupción de Sep 8 (INETER)
Ceniza caída mapa de la erupción de Sep 8 (INETER)
El Instituto Nicaragüense de Estudios Territoriales (Ineter) informa que luego de las tres 3 explosiones registradas el día de ayer, 8 de septiembre, en el Volcán San Cristóbal, éste ha entrado en una relativa calma; sin embargo, recientes datos de medición de azufre (SO2) realizados en superficie el día de hoy, entre 9:00 a.m. y 10:00a.m. arrojan cantidades de hasta 3,221 toneladas por día; muy por encima de su emisión normal de 550 a 700 toneladas, lo que podría generar eventualmente nuevas explosiones.
No se registra actividad sísmica relevante.
INETER mantiene un puesto de observación y ha destacado dos grupos de especialistas geólogos y vulcanólogos quienes en conjunto con Defensa Civil realizan valoraciones “in situ” sobre la actividad del volcán, reportándose las siguientes incidencias:
1. El material de cenizas arrojado por las explosiones ocurridas el día de ayer, cubrió un área de aproximadamente 2,438 kilómetros cuadrados (Ver mapa adjunto), distribuidos en la zona noroeste que comprende los Municipios de Puerto Morazán, Potosí, El Viejo, y las localidades de Jiquilillo y Punta Ñata. La altura alcanzada por las cenizas fue de aproximadamente 5,000 metros; con espesores de 5 centímetros, en áreas muy cercanas al cráter, hasta 3 milímetros en lugares más distantes.
2. Según información del Señor Francisco Ramos Galeano, habitante de la zona, se produjeron derrumbes en la parte norte del cráter con caída de rocas.
3. Igualmente, se reportó que en la parte noroeste del volcán cayeron cenizas con rocas incandescentes, que provocaron fuertes quemaduras a 6 semovientes.
4. Habitantes de la zona de Versalles Arriba, muy cercana al cráter del volcán, reportaron haber observado una grieta o fisura en la tierra. Los especialistas del INETER harán un recorrido en las próximas horas para analizar esta información.
5. Para la tarde de hoy y la noche hay altas probabilidades de lluvias con tormentas eléctricas en el Departamento de Chinandega. Estas lluvias pueden incrementar la emanación de gases en el volcán San Cristóbal, convirtiéndolas en lluvias ácidas. Se esperan vientos en superficie de aproximadamente 10 km/h. Al momento de lluvias estos vientos pueden alcanzar velocidades hasta de 20km/h.

Managua, 9 de Septiembre del 2012, 12.30 p.m. hora local.
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Enlaces / Fuentes:
Update Sun 09 Sep 18:30
Currently, no ash is visible on satellite data. In the latest message 11:33 GMT today, VAAC Washington reports that ash emissions are likely, but not identifiable on imagery due to weather clouds. INETER has not issued further bulletins. This suggests that the eruption has decreased a lot compared to yesterday already.
Update Sun 09 Sep 18:18
Hazard map for acid rain (INETER)
Hazard map for acid rain (INETER)
INETER reported in its last report (from yesterday) that the ash plumes have traveled 50 km to the west-north-west and most affected the communities of Elder, The Greece1, 2, 3 and 4, La Joya, Santa Catalina,El Piloto, Las Banderas, Las Rojas, Carlos Fonseca, Jiquilillo, Mechapa and Cosiguina.
INETER warns of acid rain caused by mixing of water with ash and gases and potential lahars that could be triggered by heavy rainfalls.
Source: www.ineter.gob.ni
Update Sun 09 Sep 18:08
The eruption as seen early on 8 Sep
The eruption as seen early on 8 Sep
Hazard map showing potential lahar paths (yellow:moderate risk, red: high risk) and paths of possible pyrocalstic flows (arrows)
Hazard map showing potential lahar paths (yellow:moderate risk, red: high risk) and paths of possible pyrocalstic flows (arrows)
Ash fall map as expected yesterday
Ash fall map as expected yesterday
The ash plume from the eruption seen from NASA's Aqua satellite on 8 Sep (upper left corner of image)
The ash plume from the eruption seen from NASA's Aqua satellite on 8 Sep (upper left corner of image)
Some updates about the eruption:
- Narrow escapes: 1 Canadian (tourist) and 2 young Nicaraguans (guides) have escaped miraculously death when they climbed the volcano and where only a couple of minutes from the crater rim. Suddenly all started trembling and huge incandescent blocks were flying in the air and crashing near them.
Also other people climbing the volcano at lower altitudes were surprised by the 2 strong shakes and the falling hot debris.

- 421 families have been moved to safer grounds.

- This eruption is probably larger than the one in 2006 were ash was thrown 3 km into the air.
An exclusion zone around the volcano has been set to 5 km.

- Yellow alert has been called in the Chinandego district. Leon and Managua have returned to the Green alert

- Ineter, the Nicaraguan volcano agency has reported that they are not expecting further eruptions. A spokesman from the agency said that the explosions are not considered as the start of an eruptive phase. Since 9 AM local time yesterday, no more explosions were observed.

Source: Earthquake-Report

Start of the eruption

Nicaragua's San Cristobal volcano erupted on the early morning of 8 Sep and produced an tall ash column that initially may have risen up to about 32,000 ft (10 km) altitude about 8 km above the crater (VAAC Washington) and later decreased and fluctuated between 1.5 and 5 km height.
3000 people from the nearaby villages La Bolsa, Versalles, El Pando, Pellisco and Apazate in the rural northwestern department of Chinandega were evacuated as precaution. No damages or injuries have been reported.
 

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