March 05 , 2017. EN. Turrialba , Misti , Nevado Del Huilà , Cascade Range .

Home / blog georges Vitton / March 05 , 2017. EN. Turrialba , Misti , Nevado Del Huilà , Cascade Range .

March 05 , 2017. EN. Turrialba , Misti , Nevado Del Huilà , Cascade Range .

March 05 , 2017.


Turrialba, Costa Rica.

Activity report of the Turrialba volcano:
March 4, 2017, updated at 11:00 AM

The seismograms of the seismic stations located in the upper part of the Turrialba volcano show a volcanic tremor of fluctuating mean amplitude. Due to the cloudy and rainy conditions, it was only possible to rarely observe the plume of gases and aerosols. The plume is weak, low in height and rich in water vapor and magmatic gases.


The gases and aerosols of the emission cloud are dispersed mainly south-southwest of the region of Pacayas, Paradise Valley Orosi, according to meteorological data from the National Meteorological Institute IMN, and the numerical model of calculation AERMOD. There are no reports of ash falls.

OVSICORI-A will publish a daily report on each major change in volcano activity.


Source : Ovsicori

Photo : Ovsicori


Misti , Peru :

Sismo – volcanic monitoring:

VT-type events, associated with rock fracturing within the volcano, showed similar behavior to that observed in the previous period (normal reference levels). On average, there were 38 VT per day. This type of earthquake generated a maximum displacement of 17 cm2, a recorded value considered moderate for Misti.
As for the Tremor seismicity, in relation to the continuous vibration of the system associated with fluid dynamics (gas and steam), it maintains a low activity with a record of 8 hours of Tremor accumulated during this month. On February 1, a peak activity of 7 hours of continuous Tremor (88% of the total) was recorded. Energy levels remain at low levels.


Location of events:
The spatial distribution of VT events shows that seismicity is located below the crater, between 0.5 km and 2.0 km deep. The biggest earthquake of this period took place on January 8 at 14:17 local time, with a magnitude of 3.8 ML (local magnitude) and was located about 2.0 km below the main crater .

Satellite Surveillance:
Thermal anomalies: The Mirova system ( of the University of Turin (Italy) has not detected thermal anomalies on the Misti volcano for this period (RVP = 0 megawatts).
SO2 Anomalies: The « EOS Aura » GSDM-NASA satellite system ( did not detect any significant anomalies in the density of SO2 (magma gas) on the volcano Misti.

In short, the volcanic activity remains low.


Source : IGP

Photos : IGP


Nevado Del Huilà, Colombia :

Weekly Activity Report of the Volcano Nevado del Huila

The level of activity of the volcano continues:
At activity level Yellow or (III): changes in the behavior of volcanic activity.

Analysis and evaluation of the information obtained by the monitoring network of the volcano Nevado del Huila, during the week between February 22 and 28, 2017. The Colombian Geological Survey – Popayan Volcanological and Seismological Observatory reports that:

During the period evaluated, 398 seismic events, of which 191 were related to rock fracturing (VT type) and 207 with fluid dynamics in volcanic ducts, were recorded. Of these, 201 were classified as long-term events (LP type) and six (6) as low-energy Tremor pulses (type TR).


On the images obtained during the week by the webcams of Tafxnú, Maravillas, Caloto and La Palma, the degassing activity of the volcano was observed. The column of gas observed was characterized as white and was preferably directed towards the west of the volcanic edifice.
The sensors for the monitoring of the deformation of the ground, the magnetic fields and the infrasonic waves, recorded no variation.

Therefore, it is concluded that during the evaluation period, the volcano continued to exhibit stable behavior.

Source : Ingeominas.

Photo : Archives


 Cascades Range , United – States :

Activity Update:
All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of activity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.


Recent Observations:
Seismicity and other data streams indicate that the Cascade volcanoes of Washington and Oregon all remained at background levels this past week.

The U.S. Geological Survey and Pacific Northwest Seismic Network (PNSN) continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted.


Source : CVO

Photo : USGS ( St Helens)

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