May 31 , 2017. EN . Kilauea , Sheveluch , Sabancaya , Nevado Del Ruiz , Bulusan .

Home / blog georges Vitton / May 31 , 2017. EN . Kilauea , Sheveluch , Sabancaya , Nevado Del Ruiz , Bulusan .

May 31 , 2017. EN . Kilauea , Sheveluch , Sabancaya , Nevado Del Ruiz , Bulusan .

May 31 , 2017.

 

Kilauea , Hawaï :

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:
Kīlauea Volcano continues to erupt at its summit in Halemaʻumaʻu and at Puʻuʻōʻō on the East Rift Zone, with no significant change in either eruption. The summit lava lake was about 26 m (85 ft) below the floor of Halemaʻumaʻu crater when measured this morning. The episode 61g lava flow continues to enter the ocean at Kamokuna. Active surface flows persist above and at the base of the pali southeast of Puʻuʻōʻō. These pose no threat to nearby communities. Low rates of ground surface deformation and seismicity continue across the volcano.

Spattering on the summit lava lake within Halema‘uma‘u is ever-changing, but on Sunday (May 28), two sources could be seen—one on the north side of the lake (bright area at left) and one on the southeast side (right).

Summit Observations:
Deflationary tilt began overnight and continues at the Kīlauea summit this morning. The lava lake was about 26 m (85 ft) below the rim when measured this morning. Generally, low levels of seismicity continue, with amplitudes of volcanic tremor fluctuating with the strength of lava lake spattering. Summit sulfur dioxide emission rates remain high.

L’image contient peut-être : nuage, ciel, montagne, océan, plein air, nature et eau

Puʻuʻōʻō Observations:
Webcam images show glow at long-term sources within Puʻuʻōʻō crater and from a small lava pond on the west side of the crater. The level of seismicity at Puʻuʻōʻō has not changed significantly in the last 24 hours. Minor inflationary tilt was recorded on the flank of Puʻuʻōʻō cone this morning. The sulfur dioxide emission rate from the East Rift Zone vents has been steady over the past several months and remains significantly lower than the summit emission rate.

Lava Flow Observations:
The episode 61g flow remains active and is entering the ocean at Kamokuna. Field observations earlier this week showed that the new lava delta continues to grow following the May 3 delta collapse, with narrow cracks observed running parallel to the coast. Webcam views show surface activity within the 61g flow field above and at the base of the pali southeast of Puʻuʻōʻō. Views of the recently active flows show declining surface breakout activity concentrated on the western margin of the 61g flow about 0.5 km (0.3 mi) beneath the base of the pali. The flows pose no threat to nearby communities at this time.

Source : HVO

Photos : HVO , Bruce Omori , David Ford .

 

Sheveluch , Kamchatka :

VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)

Issued: 20170531/0318Z
Volcano: Sheveluch
Current Aviation Color Code: ORANGE
Previous Aviation Color Code: orange
Source: KVERT
Notice Number: 2017-94
Volcano Location: N 56 deg 38 min E 161 deg 18 min
Area: Kamchatka, Russia
Summit Elevation: 10768.24 ft (3283 m), the dome elevation ~8200 ft (2500 m)

Volcanic Activity Summary:
According to satellite data, explosions sent ash up to 8 km a.s.l. from 0040 UTC on 31 May, and ash plume drift for about 40 km to the west from the volcano.

Explosive-extrusive eruption of the volcano continues. Ash explosions up to 26,200-32,800 ft (8-10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Volcanic cloud height: 26240 ft (8000 m) AMSL
Time and method of ash plume/cloud height determination: 20170531/0230Z – Himawari-8
Other volcanic cloud information: Distance of ash plume/cloud of the volcano: 25 mi (40 km)
Direction of drift of ash plume/cloud of the volcano: W / azimuth 272 deg

Source : Kvert

Photo : Yu Demyanchuck , IVS FEB RAS , KVERT

 

Sabancaya , Peru :

Sabancaya volcano registers slight explosion increase in last week
2017-May-30

• The explosive activity had a slight increase, registering an average of 41 explosions per day, with a maximum Reduced Displacement of 316 cm2. Continued mastery of earthquakes associated with fluid movement (Long Period), while earthquakes associated with the rise of magmatic material (Hybrids) remain low in number and energy.
• The eruptive columns of gases and ashes ascended up to approximately 2800 m above the crater, then dispersed in E and SE directions, up to ~ 30 km.
• The « SBSE » GPS station registered a small deformation in the volcano (slight inflation of ~ 3 mm) on 25 May.
• The volcanic gas flow (SO2) registered a maximum of 3904 Tons / day on 25 May.
• Two thermal anomalies were recorded with values ​​between 1 and 6 MW of Irradiated Volcanic Energy (VPR).

In general, volcanic activity shows a slight increase compared to last week. Similar behavior is expected for the next few days.

 

Source: IGP

Photo : OVI / Ingemmet ( archives)

 

Nevado Del Ruiz , Colombia :

Weekly Bulletin of Activity of the Nevado del Ruiz Volcano, from May 23 to May 29, 2017
The level of activity continues in: Yellow level of activity or (III): changes in the behavior of volcanic activity.

With regard to the monitoring of the activity of the volcano Nevado del Ruiz, COLOMBIAN GEOLOGICAL SERVICE reports that:

During the course of the last week, the different monitoring parameters show that the Nevado del Ruiz volcano continues to show an unstable behavior.

The seismicity caused by rock fracture that forms the volcano, showed a behavior similar to that of the previous week in the number of recorded earthquakes, and a slight decrease in the seismic energy released. The earthquakes were located mainly in the North, Northeast, South, Suroccidente and to a lesser extent in the Arenas crater and in the Southeast of the same to depths that oscillated between 1.3 and 9.8 km. The maximum magnitude recorded during the week was 1.2 ML (Local Magnitude), corresponding to an earthquake registered on May 29 at 08:17 (Local Time), located north of the Arenas crater, at a depth of 5.7 km.

The seismic activity associated with the dynamics of fluids inside the ducts of the volcanic structure, maintained energy levels similar to those reported the previous week. This type of activity was characterized mainly by the occurrence of multiple earthquakes of fluids, long period and very long period events and tremor pulses with varying energy levels and durations. Some of these seismic signals were associated with the emission of gases and ash to the atmosphere, as confirmed by images captured by the cameras installed in the area of ​​the volcano and by reports of PNNN and Civil Aeronautics officials. The record of seismic signals of this type, with higher energetic levels that can be associated with emission of gases and ash, is not ruled out. It is important to remember that the ash emission processes can occur for several days and sometimes several times during the day, without this implying the individual report of each episode.
On May 29, between 13:43 and 19:30 (Local Time), there were 5 episodes of Drumbeat seismicity. These episodes, unlike those recorded and reported so far (constituted by earthquakes volcano-tectonic type), was characterized by the periodic and continuous record of earthquakes type long period of low energy level. This type of seismicity is related to the process of ascending from domes  to surface.

Volcanic deformation, measured from electronic inclinometers, satellite navigation systems (GNSS) and satellite images, to determine changes in volcano inclination, position and shape, continues to record a deflationary process and intermittent inflation pulsations during the last months / Deflation possibly related to the emission of gases and ash and to the ascent of the magma to surface.

The volcano continues to emit significant quantities of water vapor and gases into the atmosphere, including sulfur dioxide (SO2), as evidenced by the values ​​obtained by the SCANDOAS stations installed in the area of ​​the volcano and the analysis of images Satellites. In the follow-up of the information provided by the MIROVA and NASA FIRMS portal, a moderate energy thermal anomaly with a value of 13 MW was identified on May 28. The column of gases, steam and occasionally ash, reached a maximum height of 880 m measured on the top of the volcano, on May 27. The direction of dispersion of the column was governed by the direction of the wind in the zone, which during the week predominated towards the Noroccidente and the Suroccidente of the volcanic building.

The volcano Nevado del Ruiz continues in activity level Yellow.

Source : Ingeominas

Photos : Archives

 

Bulusan , Philippines :

BULUSAN VOLCANO BULLETIN 31 May 2017 8:00 A.M.

Bulusan Volcano’s seismic monitoring network recorded two (2) volcanic earthquakes during the past 24 hours. Weak emission of white steam plumes that rose up to 70m before drifting southeast was observed coming from the active vents. Sulfur dioxide (SO2) emission was measured at an average of 8 tonnes/day on April 29, 2017. Precise leveling data obtained on January 29, 2017 – February 03, 2017 indicated deflationary changes since October 2016. This is consistent with data from continuous GPS measurements that indicated short-term deflation of the edifice since January 2017. However, the edifice remains generally inflated with respect to July 2016 based on continuous GPS data.

Alert Level 1 (abnormal) status remains in effect over Bulusan Volcano, which means that it is currently in a state of unrest probably driven by hydrothermal processes that could generate steam driven or phreatic eruptions. Local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited and that vigilance in the Extended Danger Zone (EDZ) must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions.

Source : Phivolcs

Photo : Archives.

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