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
San Cristobal Volcano (Nicaragua) has entered a relatively quiet
Monday Sep 10, 2012 08:14 AM | AUTEUR : T
Ash fall map of the 8 Sep eruption (INETER)The Nicaraguan Institute of Territorial Studies (Ineter) reports in its latest statement from last night that after 3 explosions on 8 Sep, San Cristobal volcano has been relatively quiet. SO2 measurements made yesterday indicate a flux of up 3.221 tons per day, which is well above normal levels and suggests that new explosions should be expected.
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.
Update Sun 09 Sep 18:30
Update Sun 09 Sep 18:18
Hazard map for acid rain (INETER)
Update Sun 09 Sep 18:08
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)
Ash fall map as expected yesterday
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.