November 08 , 2017. EN. Copahue , San Cristobal , Sheveluch , Nevado del Ruiz , Fuego .
November 08 , 2017.
Copahue , Chile :
During this period, forty (40) seismic events were recorded, of which 17 were classified as volcano-tectonic (VT), associated with fracturing processes of rigid materials, whose local magnitudes (ML) were lower or equal to M2.6. The most energetic event was in the East direction (E), 8.7 km from the active crater El Agrio, at a depth of 8.13 km. It should be noted that this earthquake was perceived and reported by people from the Caviahue area. Similarly, 23 events associated with fluid dynamics within the volcano were recorded as long-period (LP) events with a maximum reduced displacement value (RDC) of 2.4 cm2.
⦁ During the whole period, a constant low level tremor signal was recorded, mainly associated with the El Agrio crater gas outlet.
⦁ IP cameras installed in the vicinity of the volcano showed constant degassing of the active crater, characterized by sporadic ash emissions with a maximum height of 800 m. For a few days during the night period, an incandescence was visualized when weather conditions made it possible to observe the volcano.
⦁ according to data provided by the two active GNSS stations installed on the volcano, no surface deformation due to changes in the internal dynamics of the volcano was noted.
⦁ An anomaly of sulfur dioxide (SO 2) emissions to the atmosphere in the volcano sector, with a value of 282 t S02 as reported by the Ozone Monitoring Device (IMO) is reported. ) Sulfur dioxide group (http://so2.gsfc.nasa.gov/) and the National Environmental Satellite Data and Information Service (NESDIS) (http://satepsanoine.nesdis.noaa.gov) ).
⦁ No thermal warnings were reported in the area associated with the volcanic structure during the second half of the year, based on the data processed by the IRCVA (http: // www.mirovaweb.it/) and temporal thermal monitoring data of global hot spots (MODVOLC).
During the month, the activity was characterized by the emission of particles of ash and water vapor, however the seismic energy levels and the absence of deformation of the volcanic building represent a scenario inside. of what is considered the basic level of this volcano. It is deduced that the rise towards the shallow layers of a low volume magmatic body interacts with the hydrothermal system, inducing observed phenomena that can last a long time in a semi-stable state.
As a result, the Copahue volcano remains at the level of technical alert level:
GREEN LEVEL: Active volcano with stable behavior – No immediate risk – Time for possible eruption: MONTH / YEARS.
Observation: It is recommended to apply precautionary access restrictions to an area close to the crater with a radius of 1000 meters.
Source : Sernageomin
San Cristobal , Nicaragua :
Tuesday night, the INETER reported that the volcano San Cristobal recorded an activity.
According to the report, at 09:34 Tuesday night, the San Cristobal volcano recorded a total of 14 gas explosions.
In the first explosion there were ashes, which fell to the west and northwest of the volcano, mainly in the communities of Los Farallones, San Agustin, La Mora, El Naranjo and the town of Chinandega.
« The initial explosion at 21:34 was the strongest so far, bringing the real-time seismic amplitude (RSAM) to 550. After the last explosion at 22:24, the RSAM collapsed to 50 units « , details the Ineter.
« At this moment, the emission of gas and ash is moderate and does not represent a greater danger for the population, this type of activity is part of the normal process of an active volcano like San Cristóbal.
INETER will continue to inform about the volcano’s behavior, « the report concludes.
Source : el19digital.com
Sheveluch , Kamchatka :
VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA).
Issued:November 08 , 2017
Volcano:Sheveluch (CAVW #300270)
Current aviation colour code:ORANGE
Previous aviation colour code:orange
Volcano Location:N 56 deg 38 min E 161 deg 18 min
Summit Elevation:10768.24 ft (3283 m), the dome elevation ~8200 ft (2500 m)
Volcanic Activity Summary:
Satellite data show an ash cloud about 690 km to the north-east from the volcano.
Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800-49,200 ft (10-15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
Volcanic cloud height:
19680-22960 ft (6000-7000 m) AMSL Time and method of ash plume/cloud height determination: 20171108/0000Z – Himawari-8
Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 429 mi (690 km)
Direction of drift of ash plume/cloud of the volcano: ENE / azimuth 73 deg
Time and method of ash plume/cloud determination: 20171108/0000Z – Himawari-8
Source : Kvert
Photo : Yu Demyanchuck . IVS FEB RAS , KVERT
Nevado del Ruiz , Colombia :
Subject: Bulletin of activity of the Nevado del Ruiz volcano.
The level of activity continues at the level: Yellow activity level or (III): changes in the behavior of volcanic activity.
With regard to monitoring the activity of the Nevado del Ruiz volcano, the COLOMBIAN GEOLOGICAL SERVICE informs that:
During the last week, the various monitoring parameters show that the Nevado del Ruiz volcano continues to display unstable behavior.
The seismicity caused by the fracturing of the rocks that make up the volcano showed an increase in seismic energy released and a decrease in the number of earthquakes, compared to the previous week. The earthquakes were mainly in the northern distal sectors, about 6.4 km from the Arenas crater, west-southwest, 8.1 km from the crater and in the crater, as well as to a lesser extent. measured in the Northeast, Southeast, South and Southwest sectors. The depths of the earthquakes ranged between 0.6 and 7.6 km. The maximum magnitude recorded during the week was 2.2 ML (Local Magnitude), corresponding to the earthquake recorded on 02 November at 01:57 (Local Time), located 3.6 km southwest of the crater Arenas, at a distance of depth of 3.6 km.
The seismic activity associated with the dynamics of the fluids within the channels of the volcanic structure showed similar behavior in the number of registered earthquakes and in the released seismic energy, compared to the previous week. This type of activity is characterized mainly by the occurrence of earthquakes of multiple fluids, of type long periods and very long periods, as well as pulses of tremors. The earthquakes were located mainly in the vicinity of the crater of Arenas.
Volcanic deformation measured from electronic inclinometers, Global Navigation Satellite System (GNSS) stations and radar images shows stability behavior without recording significant deformation processes of the volcanic structure.
The volcano continues to emit water vapor and gases into the atmosphere, including sulfur dioxide (SO2), as evidenced by the values obtained by the SCANDOAS stations installed on the volcano and the analysis of the images. satellites. In tracking the information provided by the MIROVA and NASA FIRMS portals, two thermal anomalies were reported on November 7, both near the Arenas crater.
The column of gas and steam reached a maximum height of 1500 meters measured at the top of the volcano on November 1. The direction of the dispersion of the column was governed by the direction of the wind in the zone, which during the week prevailed towards the South-West and the South-East with respect to the crater Arenas.
The Nevado del Ruiz volcano continues at the level of yellow activity.
Source : Ingeominas
Photo : Archive SGC
Fuego , Guatemala :
MINISTRY OF RESEARCH AND GEOPHYSICAL SERVICES, SPECIAL BULLETIN # 175 – 2017 Guatemala 7 November, 2017, 07:00 o’clock. (Local hour)
End of the paroxysm:
The Fuego volcano ends at this time its eleventh eruption which has been characterized as effusive. As remains of this eruption, there are two lava flows, the first in the SECA ravine with a length of about 1,000 meters, and the second in the direction of Ceniza Canyon with a length of 800 meters. On the fronts of both streams, weak avalanches are recorded which descend to the edge of the vegetation.
OVFGO reports 6 to 8 low to moderate explosions every hour, generating ash columns ranging from 4,600 to 4,800 meters (15,091 to 15,748 feet), spreading to the west and south, reaching a distance of 10 to 15 kilometers. These explosions produce falls of ashes on the communities of Panimaché I and II, Morelia, Hagia Sophia, El Porvenir, among others.
The energy of the eruption has decreased but the chances that it will increase again in the coming days and will generate a new eruptive phase is not ruled out.
Source : Insivumeh