08/04/2015. Sabancaya, Nevado del Ruiz ,Mount Shasta .

08/04/2015. Sabancaya, Nevado del Ruiz ,Mount Shasta .

Sabancaya, Perou :

The volcanic earthquake activity of the Sabancaya is monitored by OVS-IGP through 18 seismic stations in real time (15 + 03 temporary stations). Three are telemetric stations (real time) which are located very close to the crater. During this period, the type of VT seismicity (associated with fracture of rocks), decreased, recording 51 VT / day. VT seismicity was split into forming a single seismic source, located 14 km NNE of the volcano crater, located south of Pinchollo and Maca. It is important to note that three events of magnitude 2.5 to 2.9 ML, only 2 km northwest of the volcano crater, with depths between 1 and 5 km were located.


-The Events hybrid type, indicating the rise of magmatic material remained similar to the previous period, recording four Hybrids / day. The first 3 days, the number has increased and decreased thereafter.
-The LP seismicity, indicating fluid movement in this period increased, resulting in an average of 113 LP / day; A peak of 228 LP and 207 MJ of energy recorded on April 1 is observed. Moreover, the events “Tornillos” (associated with the pressure of fluid in the cavities) were not present during this période. The Tremor-type events remained constant, resulting in an average of 4 Tremor / day; But the energy remained at a very low level.

During this period, cloudiness increased in comparison with the previous report, around Sabancaya. It has been observed that emissions from vents were constant. The emission heights have increased compared to the previous period; reaching 1,100 meters above the crater. In this period, the thermal monitoring satellite system Mirova detected no significant thermal anomaly; IMO system does not detect anomalies of SO2 for that period.

Source : IGP
Photo : Summitpost

Nevado Del Ruiz , Colombie :

Activity Bulletin of Nevado del Ruiz volcano.

Activity level (III): changes in the behavior of volcanic activity.


During the last week, the Nevado del Ruiz volcano continued to record seismic activity, mainly volcano-tectonic type associated with the fracturing of the rock in the volcanic structure. Earthquakes were mainly located in the Arenas crater to the north and south-south-west of it, at depths between 0.7 and 5.0 km. The maximum magnitude recorded during the week was 0.7 ML (local magnitude), corresponding to an earthquake event occurred on April 6 at 21:37 (local time) at a depth of 3, 9 km, located in the north of Arenas crater.

nevado del ruiz

In addition, a low-energy seismic activity was recorded, related to fluid dynamics within the volcanic conduit, which was localized mainly in the south of Arenas crater. Several episodes of volcanic tremors of low energy levels associated with the movement of fluids and gases and ash emissions were present. The continuous volcanic deformation show some changes.
In the atmosphere, the volcano continues to emit significant amounts of water vapor and gases, including sulfur dioxide (SO2). The gas and steam column reached a height of 1700 meters above the top of the volcano, and most of the time was observed white, but sometimes showed gray tones due to the presence of ash. The direction of the dispersion of the column was in line with the wind regime, which remained mainly to the northwest and southwest of the volcanic edifice.

Monitoring of the volcano is a collective task, if you see ash falls or changes in the rivers around the volcano if it please report it to the observatory.
Colombian Geological through the OBSERVATORY Volcanological of MANIZALES closely follows the evolution of the volcanic phenomenon and will continue to timely report on the changes that may occur.

Source : SGC.

Mont Shasta , Etats – Unis :

Location: California, Siskiyou County
Latitude: 41.409° N
Longitude: 122.193° W
Elevation: 4,317 (m) 14,163 (f)
Volcano type: Stratovolcano
Composition: andesite, dacite
Most recent eruption: 200-300 years ago
Alert Level: Normal

Mount Shasta earthquake series poses no immediate hazard

Since February 19, 2015 an ongoing series of small earthquakes has been occurring approximately 5 miles southeast of the summit of Mount Shasta, near the Clear Creek Trailhead on a regional, unnamed fault at about 3-5 miles depth. To date, twenty events at or above magnitude M1.0 have been recorded, the largest of which, a M2.1, occurred on April 1. A single M1.1 earthquake was recorded beneath the summit of the volcano on March 17. The current earthquake series poses no immediate hazard, but it is notable given the low overall background seismicity observed at Mount Shasta. The typical number of earthquakes per year tally to about ten events concentrated southeast of the summit between 5 to 10 miles away.

Mount Shasta

In addition to the ongoing earthquake series, seismic stations recorded a modest rock avalanche on the south flank of the mountain on March 30, at 18:20 PST. Smaller rock falls shook seismometers in the minutes preceding this event. The rock slide appears to be unrelated to the ongoing earthquakes series, as no earthquakes preceded the rock slide event.

Source : USGS
Photo : Wikipedia

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