May 06 , 2019.

Kamchatka , Ebeko :

VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA).

Issued: May 06 ,2019 
Volcano:Ebeko (CAVW #290380)
Current aviation colour code:ORANGE
Previous aviation colour code:orange
Source:KVERT
Notice Number:2019-89
Volcano Location:N 50 deg 41 min E 156 deg 0 min
Area:Northern Kuriles, Russia
Summit Elevation:3791.68 ft (1156 m)

Volcanic Activity Summary:
A moderate explosive activity of the volcano continues. Video data shows an explosion sent ash up to 3 km a.s.l., an ash cloud is drifting to the south-east of the volcano.
This moderate eruptive activity of the volcano continues. Ash explosions up to 19,700 ft (6 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft and airport of Severo-Kurilsk.

Volcanic cloud height:
9840 ft (3000 m) AMSL Time and method of ash plume/cloud height determination: 20190506/0430Z – Video data

Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 3 mi (5 km)
Direction of drift of ash plume/cloud of the volcano: SE
Time and method of ash plume/cloud determination: 20190506/0430Z – Video data

Source : Kvert .

Photo : roskosmos , Mars 2019.

Costa Rica , Irazú:

The Irazu volcano’s lagoon changes color after the crater’s inner wall has slipped.

The lagoon of Irazú volcano has changed color after a landslide of the inner wall of the crater, recorded on Thursday, May 2nd.
Regularly, it has a blue-green tone, but after the event, it became more turbid.
After that, the Volcanological and Seismological Observatory of Costa Rica (Ovsicori) reported that the material that had fallen was in place for many years.
« It is clear that the material was loose and that it had been there for more than 50 years, then over time, consistency was lost and this type of situation is generated, » said Eliécer Duarte, of Ovsicori.

He added that the color change is due to the mixing that occurs after the fall.
« The fall caused waves in the lake, which had happened on at least two occasions, the lagoon is relatively stable and homogeneous, and when it changes, the density changes, » said the expert.

For its part, Volcanoes Sin Fronteras said that the event, recorded in the western sector of the active crater of the volcano, had also formed small islands in the lagoon.
« When the materials have fallen into the lake, a wave has formed (tsunami in a lake), even on the walls of the crater, it is possible to observe the signs, which can reach 10 meters in height.
« In addition, there is a color change in the crater walls near the lake, » the organization said.

Due to the event, the Irazú Volcano National Park is functioning normally, as the landslide is not related to volcanic activity.
In the previous December, it was the lagoon of the Poás volcano that had changed color, turning to turquoise green.
For the moment, the experts said the event was due to the fact that the volcano has two pockets of activity under the lagoon that permanently inject sulfur dioxide.

On Thursday, May 2 at 12:54 pm, part of the interior wall of Irazú volcano crater slipped, as shown by the image taken by Marco Solano. The other image shows the recording produced by the landslide recorded in the VICA seismic station located in the area.

Source : nacion.com , Ovsicori .

Photos : Marco Solano Mata , 2 Mai 2019. Ovsicori.

El Salvador , San Miguel (Chaparrastique ) :

Location: San Miguel Department
Altitude: 2130 meters above sea level.
Type of volcano: Stratovolcano
Attraction type: Strombolian – Vulcanian
Last major eruption: December 29, 2013.

The values of the seismic vibration fluctuated very nearly 50 units. The values ranged from 42 to 59 RSAM units per average day. A total of six (6) low amplitude earthquakes (M1 <1.7) were recorded and located on the northern flank of the volcano. No earthquakes were perceived by the population living in the area.

Emissions of sulfur dioxide (SO2) have fluctuated between 27 and 825 tonnes per day, with the threshold at 620 t / d and the average of 311 t / d. The monitoring data indicate that the activity of the volcano changes periodically and that sudden changes in its behavior with probability of gas and ash emission are not excluded.

Source : Marn

Photo : Marn / Epa.

Indonesia , Anak Krakatau :

VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA.

Issued: May 05 , 2019 
Volcano: Anak Krakatau (262000)
Current Aviation Colour Code: ORANGE
Previous Aviation Colour Code: orange
Source: Anak Krakatau Volcano Observatory
Notice Number: 2019KRA71
Volcano Location: S 06 deg 06 min 07 sec E 105 deg 25 min 23 sec
Area: Lampung, Indonesia
Summit Elevation: 502 FT (157 M)

Volcanic Activity Summary:
Eruption with ash clouds at 22:19 UTC (05:19 local time). The eruption lasted for53 seconds.

Volcanic Cloud Height:
Ash-cloud is not visible

Other Volcanic Cloud Information:
0

Remarks:
Eruption recorded on seismogram with maximum amplitude 55mm and duration 53 second.

Level of activity at Level II (Waspada) since March 25, 2019. G. Anak Krakatau (167 m) has increased volcanic activity since June 18, 2018, followed by a series of eruptions from September 2018 to February 2019. In April 2019, eruptions continued place but of decreasing intensity. Since yesterday and until this morning, the volcano was seen covered with fog. The smoke from the crater is not observed.

The seismographs dated May 5, 2019 recorded:
1 low frequency earthquake
Tremor continuous with a dominant amplitude of 1 mm.

Recommendation: People / tourists are not allowed to approach the crater within 2 km.

Source : Magma Indonesie , Pvmbg

Photo : James reynolds via wulkanyswiata.blogspot.com , Avril 2019.