September 06 , 2016. EN. Nevados De Chillan , Copahue , Popocatepetl , California Volcanoes .

Home / blog georges Vitton / September 06 , 2016. EN. Nevados De Chillan , Copahue , Popocatepetl , California Volcanoes .

September 06 , 2016. EN. Nevados De Chillan , Copahue , Popocatepetl , California Volcanoes .

September 06 , 2016.

 

 

Nevados De Chillan , Chile :

The National Service of Geology and Mining (Semageomin) publishes the information obtained through the national network of monitoring teams, analyzed and processed by the Volcano Observatory of the Southern Andes, interpretation center of Semageomin surveillance data:

   Nevados de Chillan volcanic complex:
Activity Level: YELLOW: changes in the behavior of the volcanic activity.

864 seismic events, whose fifty-nine (59) were related to rigid material fracturing process, called volcano-tectonic earthquakes (VT), with a local maximum magnitude (ML) of M2 were recorded. Three were associated with an event located 3.6 km EastSoutheast (ESE) from the active crater at a depth of 2.8 kilometers. In addition, eight hundred and five (805) earthquakes associated with fluid dynamics within the volcanic edifice, called long-period events (LP) were recorded. The earthquake LP of greatest importance reach a local magnitude of M 2.3   with a reduced displacement (DRC) of 28.9 cm
According to data obtained from the four (4) GNSS stations and the two (2) inclinometers noting the deformation of the volcanic complex, variations of low amplitude horizontal and vertical components, that does not exceed 0.12 cm / month were observed .The GNSS control lines crossing the complex did not show strain rate greater than 0.25 cm / month. In addition, data inclinometers linked to the evolution of the internal deformation of the volcano showed only small amplitude variations.

 

nevados de chillan

The sulfur dioxide emission (S02) recorded on the Nevados de Chillan volcanic complex by the team DOAS (differential optical absorption spectrometry) Chillan Station, located 3 km to the eastnortheast (ENE) of crater active, presented a mean value of 208 ± 153 t / day average flow, which is considered low for this volcano.
During the days when weather conditions allowed the recording of images obtained by the network of cameras in the area, it has been shown a low pulsatile surface activity sporadically, characterized mainly by the emission of a plume whitish associated with the water vapor not more than 400 m above the crater.

No abnormalities in sulfur dioxide emissions (S02) in the atmosphere in the area of the volcanic field were reported, according to data obtained by the IMO Group (http: //so2.gsfc .nasa.gov /) and NESDIS (National Environmental satellite, data and information http://satepsanone.nesdis.noaa.gov).
No thermal alert was reported in the area associated with the volcano according to data released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http://modis.higp.hawaii.edu/) and Mirova ( Middle InfraRed Observation of the volcanic activity) on its website (http://www.mirovaweb.it/), the two surveillance systems indicating significant changes in the temperature of the surface of the earth.

nevados de chillan

According to the parameters of surveillance, it follows that the activity continues as part of an interaction between the surface hydrothermal system with the possible slow ascent of a small volume of magma in degassing process. Although the process has declined in intensity and is characterized by low energy, continuous the pulsatile character allows the emergence of new phreatic explosions and / or phreatomagmatic eruptions of currently active craters .. Therefore the level of volcanic alert remains in YELLOW . It is considered a high risk area, the area within 3 km of the active craters and it is recommended to restrict access in this area.

Source : Sernageomin.

Photos : Volcanes de Chiles  .

 

Copahue , Chile:

The National Service of Geology and Mining (Semageomin) publishes the information obtained through the national network of monitoring teams, analyzed and processed by the Volcano Observatory of the Southern Andes, interpretation center of Semageomin surveillance data:

During this period, 879 seismic events of which 75 were classified as volcano-tectonic (VT) associated with fracturing process of rigid materials. Similarly, it was recorded 566 events associated with the fluid dynamics within the volcanic edifice, identified as long-period events (LP) and 238 events as very long period (VLP). It is noted the persistence of VLP type of seismic activity compared with previous months.

 

copahue

Regarding the VT type of seismicity, their local magnitude (ML) was less than or equal to M 2. The highest energy event was located on the side North North -West (NNW), 5 , 7 km from El Agrio crater with a depth of 1, 7 km.
Regarding the events associated with fluid dynamics, LP, their reduced displacement values (DRC) were less than 8.5 cm2, while the VLP events had reduced displacement values (RDC) less than 28 cm2 , such events were located around the active crater.

During the reporting period, there has been a constant signal tremor, mainly associated with the gas outlet and has sporadic emissions of particles (ash) from the crater El Agrio, which recorded lower displacement values ( DRC) fluctuating around 7 cm2. The dominant frequencies are concentrated in a bandwidth from 1.2 to 2.0 Hz.
From the data obtained from three (3) GNSS stations which measure the deformation of the surface of the volcano, it was observed that the horizontal and vertical components showed no change of considerable size. In turn, the line of control that allows to monitor the volcano does not show significant variations due to changes in the internal dynamics of the volcano, showing stable during the latter period.

copahue

The sulfur dioxide emission (S02) recorded on the Copahue volcano by the team DOAS (Differential Optical Absorption Spectrometry) Triplets Station, located 5 km to the east-northeast (ENE) of the active crater, presented an average value of 1629 ± 1209 t / d and a maximum value of 3561 t / d recorded on August 31 . An increase in the magmatic component in the gas evolution is observed. The average flow is considered moderate for this volcano.
– IP cameras installed near the volcano experienced a constant degassing of the active crater El Agrio, characterized mostly by a grayish color, showing the presence of particulate matter. It was sometimes possible to see a white coloration, indicating the presence of water vapor in the system. Highlights: It was possible to observe nocturnal lights during most days reported with special appearance during the period from August 21 to 31 (with peaks on 27 and 28), of a strombolian activity limited to the area surrounding the active crater.

No anomaly in sulfur dioxide emissions (S02) in the atmosphere have been reported, according to data obtained by the sulfur dioxide Group (http IMO group: // SO2 gsfc.nasa.gov/.) and NESDIS (National Environmental satellite, data, http://satepsanone.nesdis.noaa.gov information).

A heat alert was posted on the volcanic edifice during the fortnight, on August 28, it had a radiative power (VPR) of 4 MW, considered low, according to data released by the Middle InfraRed, Observation of the volcanic activity (Mirova) on its website (http://www.mirovaweb.it/), which is a hot spot detection system.

copahue

According to the described monitoring indicators, it follows that the activity during this period was dominated by the magmatic system with the possible ascent and the degassing of a small volume of magma in a context of open channel, which, apparently disrupted the hydrothermal system, a fact highlighted by the low power of the tremor signal related to the strombolian activity and high frequency of earthquakes VLP. This activity may continue for a long period with an oscillating manner, without excluding specific increases of activity associated with small phreatic explosions and / or low strombolian activity in the crater. Therefore, restrict access to the proximal zone within a radius of 1.5 km around the crater El Agrio is recommended and therefore the level of technical alert remains in YELLOW.

Source : Sernageomin.

 

Popocatepetl , Mexico :

September 05 11:00 h (September 05 16:00 GMT)

In the last 24 hours the seismic records of the surveillance system at Popocatépetl volcano registered 95 exhalation with steam and gas emission, 7 volcanotectonic events with maximum magnitude 2.1. Furthermore there were recorded 30 minutes of low-amplitude harmonic tremor and today we recorded an explosion at 00:27 h. Although cloud conditions do not allow to observe the volcano continuously, a continuous emission of steam and gas it was observed that the winds scatter west.

 

popo

On August 30, with the support of the mexican NAVY, was carried out an overflight to the volcano . It was confirmed that the explosions that took place on 27 and 28 August destroyed the dome 69, built on 1st August. Instead it was an internal crater that has an estimated diameter of 300 meters and a depth of 30 meters. Besides intense degassing which is mainly emitted from the crater floor and walls was observed.

During the night was observed incandescence over the volcano .

At the time of this report, the cloudy conditions do not allow to observe the volcano continuously .

CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .

This type of activity is included within the scenarios Volcanic Traffic Light Yellow Phase 2.

Source : Cenapred

Photo : E. Tochimani

 

 

California Volcanoes ,  United – States :

Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN

Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.

 

ubehebe craters

Ubehebe Craters

Observations for August 1, 2016 (0000h PST) through August 31, 2016 (2359h PDT):

Mt Shasta: No earthquakes at or above M1.0 were detected.
Medicine Lake: Two earthquakes at or above M1.0 were detected, with the largest registering M1.71.
Lassen Volcanic Center: One earthquake at or above M1.0 was detected (M1.70).
Clear Lake Volcanic Field: One earthquake at or above M1.0 was detected (M1.47). [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.96].
Long Valley Volcanic Region: In Long Valley Caldera, 56 earthquakes of M1.0 or greater were detected, with the largest event registering M3.53. Many of these events occurred during minor earthquake swarms on August 10-15, 2016 and August 21, 2016 about 4 and 8 km, respectively, southeast of the town of Mammoth Lakes. Three earthquakes at or above M1.0 were detected in the Mono Craters region, with the largest registering M1.37. One earthquake at or above M1.0 (M1.09) was detected under Mammoth Mountain. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M3.49].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Eleven earthquakes of M1.0 or greater were detected. The largest registered M1.83.
Coso Volcanic Field: The typical high level of seismicity was observed, with 5 earthquakes M1.0 or greater. The largest registered M2.78.

The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted.

 

Source : CALVO

Photo : marlimillerphoto.com

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