Cerro Negro de Mayasquer volcano news & activity updates:
Cerro Negro de Mayasquer volcano (Colombia): continuing earthquakes, appearance of seismic tremor
Saturday Nov 22, 2014 10:27 AM | BY: T
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.
While most quakes have been very small, a few were strong enough to be felt by local inhabitants.
One possible cause of the earthquake swarm is a magma intrusion at depth, which could be a precursor to new activity of the volcano. This hypothesis is becoming more likely since weak episodes of seismic tremor have started to appear on seismic recordings of stations near the volcano. Tremor are long-lasting regular ground vibrations typical for fluid movements at depth. These could be magma, gasses and/or hydrothermal fluids (water). Which of them is responsible cannot be said at the moment.
Wednesday, Oct 22, 2014
Wednesday, Jul 23, 2014
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. ... read all
Friday, May 30, 2014
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. ... read all
Saturday, May 10, 2014
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. read all
Friday, May 02, 2014
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. ... read all