Eruption of San Cristobal volcano, Nicaragua, 8 Sep 2012 - updates
Volcano quiet for the moment
Update Mon 10 Sep 10:34
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.
Current seismic signal from San Cristobal
San Cristobal Volcano (Nicaragua) quiet for the moment
Mon, 10 Sep 2012, 08:1408:14 AM | BY: T
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.
Ash fall map of the 8 Sep eruption (INETER)
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.
Links / Sources:
Links / Sources:
- Comunicado No.3. Actividad Sismo - Volcánica en el País. (Explosiones Volcán San Cristóbal y Episodios Sísmicos Apoyeque – Xiloá) (INETER)
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 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.
Hazard map for acid rain (INETER)
INETER warns of acid rain caused by mixing of water with ash and gases and potential lahars that could be triggered by heavy rainfalls.