Ubinas volcano (Peru): phreatic explosions
Sun, 16 Feb 2014, 12:0812:08 PM | BY: T
Seismic activity at Ubinas during 14 Feb and since 31 Jan (IGP)
The volcano could be in the process of entering a new eruptive phase. Two small (likely phreatic) explosions occurred last Friday at 13:46 and 14:45 h local time (18:46 and 19:45 GMT), ejecting plumes of ash and steam rising approx. 1.5-2 km. A strong sulfur smell was noticed in up to 5 km distance.
Details of the seismogram on 14 Feb (IGP)
Ubinas, Peru's most active volcano, had been showing increased signs of unrest since the beginning of the month. Episodes of tremor occurred frequently during 1-9 Feb, accompanied by intense fumarolic activity. Tremor decreased after 9 Feb, but a swarm of long-period earthquakes occurred with up to 80 quakes detected per day.
An important increase in SO2 emission (500 tons/day on 7 Feb) was measured, which suggests the presence of new magma. In addition, INGEMMET detected 25-30 mm inflation of the southern flank, but notes that it is likely a sign of its structural instability, enhanced by the current seismic activity (as opposed to being a sign of magma pushing from inside).
Authorities have distributed dust masks to people in the areas of Cancosani, Titi and Cangalle.
Links / Sources:
Links / Sources:
Mon, 3 Feb 2014, 16:52
Two small earthquake swarms occurred in January, the latest bulletin of the Peru's Geophysical Institute (IGP) reports. The first one happened between 8-9 Jan, and the second and stronger one on 25 Jan. In addition, bluish degassing (SO2, an indicator of the presence of magma) was observed. Read all
Wed, 16 Oct 2013, 07:56
Surface and seismic activity have calmed down recently and are near background levels. ... Read all