February 07 , 2018. EN. Kilauea , Mayon , Nevado del Ruiz , Shishaldin , Nevados de Chillan.

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February 07 , 2018. EN. Kilauea , Mayon , Nevado del Ruiz , Shishaldin , Nevados de Chillan.

February 07 ,  2018.

 

Kilauea , Hawai :

For  Sean King….

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
No significant change. Kīlauea continues to erupt at its summit and from the Puʻu ʻŌʻō vent on its East Rift Zone. The level of the summit lava lake has risen slightly since it was measured at about 34 m (110 ft) below the floor of Halemaʻumaʻu crater yesterday morning. The episode 61g lava flow is producing scattered surface flow activity at the base of the pali, and on the upper flow field. Lava is not entering the ocean at this time, and active flows currently pose no threat to nearby communities.

Shifty winds, initially blowing out of the southwest, allowed us have a different perspective of Pu‘u ‘O‘o’s lava lake. The intensely glowing surface bubbled and spattered as we hovered over its western rim.

Summit Observations:
Summit tiltmeters recorded inflation during the past day. The level of the lava lake rose in concert with the inflationary tilt and is slightly higher than yesterday morning, when it was measured at about 34 m (110 ft) below the floor of Halemaʻumaʻu crater. Sulfur dioxide emission rates remain high. Seismicity is at normal levels, with tremor fluctuations related to the vigor of lava lake spattering.

Puʻu ʻŌʻō Observations:
The tiltmeter on Puʻu ʻŌʻō cone recorded no significant change in tilt during the past day. Overnight, intermittent webcam views show that glow persists from a small lava pond on the west side of the crater. The sulfur dioxide emission rate from the East Rift Zone vents remains significantly lower than the summit emission rate.

A downpour creates voracious cloud of steam, engulfing the entire active breakout.

Lava Flow Observations:
The episode 61g flow is still active, but no lava is flowing into the ocean. Based on web cam views, surface lava flow activity continues on the upper portion of the flow field near Puʻu ʻŌʻō, on the pali, and in scattered areas below the pali on the back of the coastal plain. These lava flows pose no threat to nearby communities at this time.

Source : HVO

Photo : Bruce Omori

 

Mayon, Philippines : 

MAYON VOLCANO BULLETIN 07 February 2018 08:00 A.M.

Mayon’s activity in the past 24 hours was characterized by near continuous lava fountaining, lava flow and degassing from the summit crater. Seventy eight successive lava fountaining episodes, 152 in total since 5:57 AM of 5 February, have been recorded by the seismic network. Discrete episodes lasted three to 41 minutes and were accompanied by rumbling sounds audible within 10 kilometers of the summit crater. Persistent steam-laden plumes rose up to 2.5 kilometers from the summit before drifting east and northeast. Throughout the night, lava flows and consequent incandescent rockfalls were observed in the Miisi and Bonga-Buyuan channels. Effused volumes of incandescent lava flows have advanced to 3.3 and 4.5 kilometers down the Miisi and Bonga-Buyuan channels, respectively, from the summit crater. Pyroclastic density currents or PDCs have deposited to the 4.6, 4.4 and 4.2 kilometer reaches of the Miisi, Bonga and Basud Gullies, respectively.

A total of eighty-three (83) volcanic earthquakes, most of which corresponded to lava fountaining events were recorded by Mayon’s seismic monitoring network. Sulfur dioxide gas emission was measured at an average of 1,885 tonnes/day on 06 February 2018. Electronic tilt and continuous GPS still record sustained swelling or inflation of the edifice since November and October 2017, consistent with pressurization by magmatic intrusion.

Alert Level 4 remains in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft.

DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

Source : Phivolcs

 

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 rock fracturing showed an increase in the number of events and released energy, compared to the previous week. A seismic increase recorded on January 31, located in the southwest sector of the volcano (about 5.2 km from the crater Arenas), at depths between 3.0 and 5.6 km is worth noting. The maximum magnitude recorded during the week was 2.7 ML (Local Magnitude) corresponding to the earthquake recorded at 16:56 (Local Time) on January 31, located southwest of Arenas Crater, at a depth of 3.0 km . Other active sources during the week were the Northeast and Southwestern areas of the volcanic structure; as well as in the Arenas crater, at depths between 0.5 and 8.0 km.

Regarding the seismicity related to the dynamics of the fluids inside the volcanic conduits , there was also an increase in the number of earthquakes, although in terms of seismic energy, values ​​similar to those reported the previous week have been recorded.
This type of activity is mainly characterized by the occurrence of multiple fluid earthquakes, long periods and very long periods, as well as tremor pulses. The earthquakes were located mainly in the vicinity of the crater of Arenas and in the Southeast areas of the volcano.

Volcanic deformation measured from electronic inclinometers, Global Navigation Satellite System (GNSS) stations and radar images shows stability behavior without recording significant deformation processes.

The volcano continues to emit water vapor and gases into the atmosphere, among which the sulfur dioxide (SO2) is distinguished, as evidenced by the values ​​obtained by the SCANDOAS stations installed on the volcano and the analysis satellite images. In monitoring the information provided by the MIROVA and NASA FIRMS portals, several thermal anomalies have been recorded near the Arenas crater.
The column of gas and steam reached a maximum height of 850 meters measured at the top of the volcano on 2 February. The direction of the dispersion of the column was governed by the direction of the wind in the area, which during the week prevailed to the northwest and southeast towards the crater Arenas.

The Nevado del Ruiz volcano continues at the level of yellow activity.

Source : SGC

 

Shishaldin , Alaska :

54°45’19 » N 163°58’16 » W,
Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Low-level unrest continues at Shishaldin volcano. A robust steam plume was observed in several satellite images yesterday afternoon, extending towards the north for about 50 miles (80 km) at an altitude of 10,000 ft (3 km) asl. This may be due to favorable atmospheric conditions rather than an increase in degassing. Earthquakes continue to be observed, but at decreased levels relative to the past few weeks. Web camera observations were obscured by clouds.

Source : AVO

Photo : Schaefer, Janet , 07 Janvier 2018  , 11:25 AM

 

Nevados de Chillan , Chile :

During this period, 4793 seismic events were recorded, of which 93 were classified as volcano-tectonic (VT), associated with fracturing processes of rocks, with magnitudes less than or equal to M 2.8. The largest energy event was located 0.6 km east-northeast of the active crater at a depth of 2.9 km. In addition, 470 earthquakes associated with fluid dynamics were recorded, of which 3170 were classified as long-period (LP) events with maximum reduced displacement values ​​of 200 cm2, except for one event. associated with an explosion recorded on 02 February at 16.30 local, which reached a value of 440 cm2, with an acoustic signal of 14 Pa at a distance of one km. In addition, 1 earthquake type VLP (very long period type) was recorded; with displacement values ​​reduced by 6.1 cm2. Finally, 1529 earthquakes of the tremor type were recorded, with maximum reduced displacement values ​​of 260.6 cm2.

During the second half of January, two consecutive overflights were conducted on January 23 and 31, during which temperature measurements gave values ​​of 305 and 480 ° C on the surface of the dome, mainly in the crack . whose reported explosions originate.

In the images obtained during the overflight, and those obtained by the satellite images, it was possible to determine an approximate range of dome growth, at 2540 m3 / day (0.029 m3 / s), which is a low estimate. for this type of phenomenon. The total estimated volume reaches an approximate value of 106 400 m3. A small area of ​​deposits associated with the collapse of the dome walls has been observed.

The images obtained through the cameras installed in the vicinity of the volcanic complex showed emissions of ash and mainly water vapor associated with explosions with column heights of less than 1000 m compared to the crater level, with the exception of the aforementioned explosion. in the REAV of February 2, which reached a height of about 2500 meters. During the nights, the cameras recorded a sporadic glow, associated with some explosions.

According to the data provided by the five (5) GNSS stations in service on the volcano, minor variations are observed in the stations located on the volcano, with, in addition, a slight elongation (between 2 and 4 mm) of the distances between the stations. that cross the active cone (control lines). The data provided by the inclinometer stations show stable positions during the last period.

No sulfur dioxide (S02) emissions have been reported in the volcanic complex sector, as published by the Ozone Monitoring Instrument, Sulfur Dioxide Group (IMO) (http: //so2.gsfc .nasa.gov /).
Two (2) thermal warnings in the area associated with the volcanic complex (1 MW) were reported on January 17, according to data processed by Infrared Observation of Volcanic Activity (Mirova).
Between January 23rd and 27th in a measurement campaign carried out on the Nevados complex in Chilian, the emission of S02 gas through a UV chamber was realized. The average value of the quenched exhalations corresponds to 260 tonnes per day (t / d), with maximum values ​​of 700 t / d, in accordance with a degassed magma as in the case of a dome. Similarly, the control of the physico-chemical parameters of the thermal zones adjacent to the Complex was realized, without finding any changes of temperature and pH compared to previous years.

The explosive activity associated with the growth of the lava dome located in the Nicanor crater continues. It is possible that the explosion of 02 February is the result of a collapse of the lava dome. 90% of the lava domes are destroyed this way. The destruction of the dome could be associated with a larger vulcanian-type explosion, the strength of which depends on the volume of underlying magma, with the possibility of generation of pyroclastic flows and projections over long distances.

For all this, the level of volcanic alert is maintained at the level:
YELLOW LEVEL: Changes in the behavior of volcanic activity

Observation: It is recommended to apply precautionary access restrictions in an area close to the crater with a radius of 4 kilometers around the active crater.

Source : Sernageomin .

 

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