Cerro Negro de Mayasquer volcano (Colombia): continuing earthquakes, appearance of seismic tremor
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.
sab, 22 nov 2014, 10:2710:27 AM | AUTORE: T
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.
Wed, 5 Nov 2014, 06:00
Chiles-Cerro Negro volcano (Colombia-Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 5 November-11 November 2014 (New Activity / Unrest)
On 4 November Servicio Geológico Colombiano's Observatorio Vulcanológico and Sismológico de Pasto (SGC-OVSP) reported that seismic activity at Cerro Negro de Mayasquer and Chiles volcanoes remained elevated. Since 29 September 2014 about 132,000 earthquakes had been detected, with 3,200 of those events occurring on 4 November. During the previous week hypocenters were located 0.3-6.3 km S and SW of Chiles, at depths of 3-9 km below the summit. ... Read all
Wed, 22 Oct 2014, 09:24
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