Sabancaya volcano (Peru): seismic unrest and ground deformation

Tue, 14 May 2013, 15:17 | BY: T

Ground deformation (deflation) at Sabancaya volcano measured by InSAR (IGP)

Location of recent earthquakes (IGP)

Seismic activity during the past weeks (IGP)

The possible ash emissions on 9 May have not been confirmed, but unrest in the form of increased earthquake activity and ground deformation has increased since early May, the Geophysical Institute of Peru (IGP) reported in its press release on 10 May.
So-called "hybrid" earthquakes (related to both the fracturing of rock and fluid movements) have increased since 2 May, while purely volcanic-tectonic quakes have remained stable.
Satellite-born InSAR radar measurements showed that the area of the current seismicity (north-east of the volcano, just above the village of Hornillo), has shown subsidence of about 7 cm, which is possibly related to magma draining from there into different reservoirs.

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Information about: Sabancaya volcano

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Report by IGP 10 May

Previous news

Sun, 12 May 2013, 16:35

Sabancaya volcano (Peru): possible ash emissions

Possible eruptions have started at the volcano. Pilots reported several volcanic ash plumes from the volcano in the past days although VAAC Buenos Aires could not identify ash on satellite imagery. ... Read all

Wed, 8 May 2013, 06:00

Sabancaya volcano (Peru) - Smithsonian / USGS Weekly Volcanic Activity Report for 8 May-14 May 2013 (Continuing Activity)

On 10 May Instituto Geofísico de Perú (IGP) reported that results of an interferogram of Sabancaya provided by a collaborator at Cornell University showed that an area of deformation (subsidence of 7 cm centered at 6 km NE of the crater) was coincident with the main area of seismicity. Volcano-tectonic (VT) earthquakes continued to dominate the seismic signals, although long-period (LP) events continued to be detected. There was also an increase of hybrid events. ... Read all

Sun, 7 Apr 2013, 06:43

Sabancaya volcano (Peru): decreasing seismic unrest

Numbers of earthquakes at Sabancaya over the past weeks (IGP)

Seismic activity has decreased at the volcano, the latest press release of IGP shows. It seems less likely now that the volcano will produce an eruption soon,- as in many cases, an intrusion has happened at depth without (so far) breaching the surface (= erupting). ... Read all

Thu, 4 Apr 2013, 17:36

Sabancaya volcano (Peru): continuing earthquakes, degassing

IGP report #8 about Sabancaya (2 April 2013)

Volcanic earthquakes continue at high rate, and there is increased SO2 degassing, as the surface expression of fresh magma intruding at shallow depth. ... Read all

Wed, 3 Apr 2013, 06:00

Sabancaya volcano (Peru) - Smithsonian / USGS Weekly Volcanic Activity Report for 3 April-9 April 2013 (Continuing Activity)

On 4 April Instituto Geofísico de Perú (IGP) reported that volcano-tectonic (VT) earthquakes at Sabancaya dominated the seismic signals although long-period (LP) events continued to be detected. ... Read all

Wed, 27 Mar 2013, 06:00

Sabancaya volcano (Peru) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 March-2 April 2013 (New Activity / Unrest)

In an Instituto Geofísico de Perú (IGP) report, a photo showed a fumarolic plume rising above Sabancaya on 8 March. During the third week of March, a bluish colored plume rose 500 m above the crater, possibly indicating sulfur dioxide emissions. On 25 March the seismic network detected a continuing high rate of volcano-tectonic (VT) earthquakes and an increasing number of long-period (LP) events. ... Read all