Eruption of San Cristobal volcano, Nicaragua, 8 Sep 2012 - updates
Volcano quiet for the moment
Update Mon 10 Sep 10:34
San Cristobal Volcano (Nicaragua) quiet for the moment
Monday Sep 10, 2012 10:14 AM | BY: T
No significant seismic activity is recorded. INETER keeps a close watch of the volcano with 2 groups of geologists and volcanologists together with Civil Defence. Analysis of the eruption on 8 Sep gives the following data:
1. The ash fall covered an area of about 2.438 square kilometers (see attached map), distributed in the northwest that includes the municipalities of Puerto Morazán, Potosi, El Viejo, and the towns of Punta Jiquilillo and Punta Ñata. The height reached by the ash was approximately 5,000 meters above the craters and the maximum ash fall deposit was 5 inches in areas very close to the crater, while it was only up to 3 millimeters in more distant places.
2. According to information from Mr. Francisco Ramos Galeano, a resident of the area, there were landslides in the northern part of the crater with falling rocks.
3. Similarly, it was reported that in the northwestern part of the volcano ash and incandescent rocks fell, which caused severe burns to 6 livestock.
4. Inhabitants of the area of Versailles Top, very close to the crater of the volcano, reported having seen a crack or fissure in the earth. INETER specialists will be going to investigate this in the field.
5. For the afternoon and evening there are high chances of rain with thunderstorms in the Department of Chinandega. These rains can increase the emission of gas in the San Cristobal volcano, making acid rain. Surface winds are expected in about 10 km / h. Rains when these winds can reach speeds of up to 20km / h.
Managua, September 9, 2012, 24:30 local time.
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Monday, Sep 10, 2012
Earthquakes often precede eruptions, sometimes by only hours, and sometimes by several months. While most seismic activity at volcanoes is not necessarily followed by an eruption, almost all eruptions are preceded and sometimes accompanied by earthquake activity at shallow depths near the volcano. Therefore, recording earthquakes near active and dormant volcanoes is an important tool in monitoring and eruption prediction. [more]
Sunday, Sep 09, 2012
Some elevated seismic activity and weak pulses of tremor are still occurring at White Island, but there have not been any recent ash emissions. [more]
Update Sun 09 Sep 18:30Currently, 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
INETER warns of acid rain caused by mixing of water with ash and gases and potential lahars that could be triggered by heavy rainfalls.
Update Sun 09 Sep 18:08
- 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.
Start of the eruptionNicaragua'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.