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Cerro Negro de Mayasquer volcano news & activity updates:
Wed, 7 Aug 2019, 12:05
Instituto Geofísico de la Escuela Politécnica Nacional (IGEPN) and the Observatorio Vulcanológico y Sismológico de Pasto del Servicio Geológico Colombiano (SGC OVSP) jointly reported that the most recent seismic swarm below Cerro Negro de Mayasquer and Chiles volcanoes began in September 2018 and continued at least through 1 August. ...more
Sun, 24 May 2015, 12:15
Number of earthquakes under Chiles-Cerro Negro volcano during the past months (IGPEN)
Seismic activity at the volcano has been decreasing during the past months. No other signs of volcanic unrest have been detected.
Mon, 19 Jan 2015, 10:58
Earthquake locations at Chiles volcano during 1-8 Jan 2015 (IGEPN)
Seismic activity remains high with an average of almost 1200 small quakes detected on a daily basis under the Chiles volcano. ...more
Mon, 8 Dec 2014, 09:49
Histogram of earthquakes at Chiles volcano (IGPEN)
Seismic activity continues to be important. In the last week, almost 20,000 earthquakes with a daily average of 2845 were detected. 5 of them were felt by the local population, the largest one was a 3.8 event on 2 Dec at 17:58 local time. ...more
Thu, 4 Dec 2014, 19:48
The volcano's alert level was decreased to Yellow. Seismic remains above background, but has decreased significantly recently.
Sat, 22 Nov 2014, 10:27
The seismic crisis that began last year continues at high intensity. During the ongoing swarm more than 206,000 earthquakes have been detected in an area 4 km south of the Chiles-Cerro Negro complex since 29 Sep alone. Daily numbers of quakes have ranged between 3700-5400 earthquakes. ...more
Wed, 22 Oct 2014, 09:24
Wed, 23 Jul 2014, 14:37
Seismic unrest continues at the volcanic massif of Chiles and Cerro Negro. However, it decreased during the past week with less than 700 events recorded, compared to 1500-1800 per week during the month before. ...more
Fri, 30 May 2014, 09:42
Unrest at the volcano continues in the form of earthquakes under the Chiles-Cerro Negro volcanic massif. During the past week, the monitoring network recorded around 6500 quakes, mostly located less than 4 km SW from the summit at depths ranging between 1 and 8 km and with magnitudes of up to 4.0 on the Richter scale. ...more
Sat, 10 May 2014, 06:34
Earthquakes under Cerro Negro de Mayasquer (IGPEN)
The seismic crisis under the volcano continues. Thousands of small earthquakes, both volcano-tectonic (due to rock fracturing caused by magma pressure) and long-period (due to fluid movements) earthquakes continue to be registered. ...more
Fri, 2 May 2014, 09:38
The alert level of the twin-volcanoes Cerro Negro and Chiles has been raised to yellow in response to an ongoing seismic crisis and deformation that has been detected since November 2013, when a new monitoring network had been installed. ...more
Thu, 13 Mar 2014, 17:46
Map of seismicity near Cerro Negro volcano (Image: INGEOMINAS / Pasto Observatory)
More than 11,000 micro-earthquakes at shallow depths were recorded beneath the volcanoes of Cerro Negro de Mayasquer and Chiles during the past few months, INGEOMINAS Pasto volcano observatory reported. ...more
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