![Ash emission from San Cristobal (image: SINAPRED)]()
Ash emission from San Cristobal (image: SINAPRED)
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.
![This morning's seismic signal (CRIN station, INETER) showing continuous tremor]()
This morning's seismic signal (CRIN station, INETER) showing continuous tremor
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.
INETER reported that on 26 December four explosions at San Cristóbal produced ash plumes that were observed in satellite imagery drifting W and reaching the Pacific Ocean. Ashfall was reported in areas within 5-6 km of the volcano. The next day explosions produced ash plumes that rose 200 m above the crater.
![Seismogram nn 19 Dec 2012 at CRIN station (INETER)]()
Seismogram nn 19 Dec 2012 at CRIN station (INETER)
Banded volcanic tremor has reappeared on the seismic recording.
INETER reported that on 25 December at 1800 seismicity at San Cristóbal increased. A series of explosions starting at 2000 produced ash-and-gas plumes that rose 500 m above the crater and drifted SW and likely W. Ash fell near the volcano.
![Tremor signals on seismic recording on 14 Nov (CRIN station, INETER)]()
Tremor signals on seismic recording on 14 Nov (CRIN station, INETER)
Some tremor has been appearing periodically on the seismic recordings from San Cristobal in recent days.
![Current seismogram at CRIN station (INETER)]()
Current seismogram at CRIN station (INETER)
![Current seismogram from San Cristobal (CRIN station, INETER)]()
Current seismogram from San Cristobal (CRIN station, INETER)
Earthquakes and long-period events are frequent on the seismic recording, but there are no reports of new activity.
![Current seismic signal from CRIN station (INETER)]()
Current seismic signal from CRIN station (INETER)
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.
Sat, 22 Sep 2012, 09:46
![Seismic signal on 21 Sep (CRIN station, INETER)]()
Seismic signal on 21 Sep (CRIN station, INETER)
A number of volcanic quakes and long-period events can be seen on the seismic recordings during the past days, but there have not been any reports of new activity.
Wed, 19 Sep 2012, 10:05
![Current seismic signal from CRIN station (INETER)]()
Current seismic signal from CRIN station (INETER)
The volcano has been calm the past days. On the seismogram, few weak quakes and long period events are visible.
Mon, 17 Sep 2012, 10:05
Elevated SO2 emission continues to be measured. On 15 Sep, SO2 flux was measured at 3,054 tonnes per day. INETER suggests in its latest press release yesterday evening that this increase might have been caused by a liberation of the conduits. Early yesterday, between 6:50 - 827 am local time, there was a pulse of tremor and 2 week earthquakes at 7:47 a.m. and 7:51 a.m. which could not be felt (see image from yesterday's update). Today, the seismicity has been rather low again.
Sun, 16 Sep 2012, 10:05
![Current seismic signal (INETER)]()
Current seismic signal (INETER)
A small explosion occurred yesterday at 8:17 am local time. Recent measurements showed an increase of SO2 emissions to 2,490 tons per day, i.e. almost double than before. Also, seismic tremor increased in the evening of 15 Sep. (Source: INETER)
Sat, 15 Sep 2012, 10:05
San Cristobal volcano had only weak emissions yesterday. After 3:40 am INETER observed a rising tremor signal.
Read allFri, 14 Sep 2012, 10:05
![Current seismic signal CRIN station (INETER)]()
Current seismic signal CRIN station (INETER)
San Cristóbal has intermittent weak explosions, such as early on 13 Sep at 02:11 local time, when a seismic explosion signal was recorded.
Read allThu, 13 Sep 2012, 08:07
![Seismic signal on 12 Sep (CRIN station, INETER)]()
Seismic signal on 12 Sep (CRIN station, INETER)
A new moderate explosion occurred on the evening of 11 Sep shortly before 20h00, INETER reports. Seismic activity remains elevated.
Wed, 12 Sep 2012, 10:05
3 small explosions occurred yesterday afternoon (at 3:33, 3:35 and 3:36 p.m.) and produced small steam and ash clouds rising 300 m above the crater.
Wed, 12 Sep 2012, 06:00
On 10 September, INETER reported that seismicity decreased after the 8 September eruption at San Cristóbal. Sulfur dioxide emissions had decreased since the previous day. During 10-11 September steam plumes rose 200-300 m above the crater and drifted W.
Read allTue, 11 Sep 2012, 10:05
After the explosion on 08 September, San Cristobal remained quiet and there is only low-energy microseismicity, and weak steaming at the moment, creating a plume of 250-300 m above the crater.
Read allMon, 10 Sep 2012, 08:14
![Ash fall map of the 8 Sep eruption (INETER)]()
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.
Read allSun, 9 Sep 2012, 16:34
Sun, 9 Sep 2012, 10:05
INETER reports that San Cristobal Volcano's activity remains with sporadic explosions, ash columns have fluctuated between 5,000 m to 1,500 m. The ash plumes have traveled 50 km to the west-north-west. The communities most affected are the Elder, The Greece1, 2, 3 and 4, La Joya, Santa Catalina,El Piloto, Las Banderas, Las Rojas, Carlos Fonseca, Jiquilillo, Mechapa and Cosiguina.
Read allSun, 9 Sep 2012, 05:20
![Eruption of San Cristobal volcano early this morning (image courtesy: INETER)]()
Eruption of San Cristobal volcano early this morning (image courtesy: INETER)
Nicaragua's San Cristobal volcano erupted yesterday (8 Sep) morning and produced an tall ash column that initially may have rises up to about 32,000 ft (10 km) altitude (about 8 km above the crater) and later quickly decreased.
Read allWed, 5 Sep 2012, 06:00
INETER reported that on 8 September three explosions from San Cristóbal produced ash-and-gas plumes that rose 1.5 km above the crater and drifted 9 km/hr NW. Ashfall was reported in El Viejo (18 km WSW), El Chonco, and Ranchería. Sporadic explosions later that day generated ash plumes that rose 1.5-5 km and drifted 50 km WNW.
Read all
