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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity

An eruption occurred on January 10, 2019 at 19:55 at Agung, on the island of Bali. The height of the plume could not be estimated due to fog. It is announced up to 6,000 meters to NNW by VAAC Darwin.

(Note that the media reporting the eruptive episode use old photos.)

On the seismogram, the recording has a maximum amplitude of 22 mm and a duration of about 4 minutes 26 seconds. According to information obtained by Bali Express, a number of residents of Bali's highest mountain ring heard a roar, which would coincide with the eruption.

Ash rains occurred in the Desa Ban area of ​​Kubu district, as far as Terunyan village, Kintamani district, Bangli.

 Agung - image Sentinel-2 image on bands 12.8A, 4 SWIR / 08.01.2019, revealing some hot spots in the crater.

 Agung - image Sentinel-2 image on bands 12.8A, 4 SWIR / 08.01.2019, revealing some hot spots in the crater.

Agung - 10.01.2019 - Ash Advisory Volcanic / VAAC Darwin - Ash Cloud Position / Flightradar - one click to enlarge
Agung - 10.01.2019 - Ash Advisory Volcanic / VAAC Darwin - Ash Cloud Position / Flightradar - one click to enlarge

Agung - 10.01.2019 - Ash Advisory Volcanic / VAAC Darwin - Ash Cloud Position / Flightradar - one click to enlarge

On the last image of the Sentinel 2 satellite, dated January 8, we can see various hot spots on the slab in the crater; a very slight thermal anomaly of 1MW is recorded by Mirova on January 10 at 18:10.

The PVMBG maintains the level of activity at 3 / siaga, with a 4 km radius danger zone around the crater and recommendations not to park in the drainages, where a lahar possibility exists.

VA ADVISORY
DTG: 20190110 / 1245Z
VAAC: DARWIN
VOLCANO: AGUNG 264020
PSN: S0821 E11530
AREA: INDONESIA
SUMMIT ELEV: 3142M
ADVISORY NR: 2019/2
SOURCE INFO: HIMAWARI-8, VONA
AVIATION COLOR CODE: ORANGE
ERUPTION DETAILS: VA TO EXT FL180 NW 15KTS
OBS VA DTG: 10 / 1245Z
OBS VA CLD: SFC / FL180 S0820 E11532 - S0823 E11531 - S0820
E11520 - S0815 E11519 - S0814 E11525 MOV NW 15KT
FCST VA CLD +6 HR: 10 / 1845Z SFC / FL180 S0823 E11532 - S0803
E11431 - S0737 E11422 - S0735 E11453 - S0820 E11534
FCST VA CLD +12 HR: 11 / 0045Z SFC / FL180 S0820 E11534 - S0824
E11531 - S0804 E11431 - S0738 E11423 - S0736 E11454
FCST VA CLD +18 HR: 11 / 0645Z SFC / FL180 S0823 E11531 - S0807
E11431 - S0738 E11423 - S0739 E11454 - S0820 E11534
RMK: VA TO EX FL180 NW 15KTS OBS ON 10 / 1220Z SAT IMAGERY.
VONA 10 / 1223Z CONFIRMS ERUPTION. HEIGHT BASED ON IR TEMP OF
-5C AND MODEL GUIDANCE. MOVEMENT BASED ON HIMAWARI-8 AND
MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20190110 / 1345Z

Sources: PVMBG, Magma Indonesia, VAAC Darwin
 

In Krakatau, an excellent report by James Reynolds / EarthUncut Tv reveals the current morphology of the volcano.

The surtseyan activity produced a tufa ring, which separates a "crater lake" from the ocean; a trace on the inner circumference reveals height differences between the current external and internal levels. Gaseous emissions and steam are observed on its edges near the ocean.

An intense hydrothermal activity is outstanding, as evidenced by the coloring of the water, tinted by particles of iron hydroxide.

The coast of Rakata, facing Krakatau, a place known for camping and watching the volcano, was disfigured by the tsunami and landslides about 25 meters high.

Anak Krakatau on 10.01.2019 - the "crater lake"; note the differences in level since the eruption of 22.12 on the edges and degassing on the periphery - photo James Reynolds / EarthUncut Tv
Anak Krakatau on 10.01.2019 - the "crater lake"; note the differences in level since the eruption of 22.12 on the edges and degassing on the periphery - photo James Reynolds / EarthUncut Tv

Anak Krakatau on 10.01.2019 - the "crater lake"; note the differences in level since the eruption of 22.12 on the edges and degassing on the periphery - photo James Reynolds / EarthUncut Tv

Anak Krakatau - 10.01.2019 - color of the sea due to hydrothermal activity - photo James Reynolds / EarthUncut Tv

Anak Krakatau - 10.01.2019 - color of the sea due to hydrothermal activity - photo James Reynolds / EarthUncut Tv

Rakata, the coast facing the anak Krakatau disfigured by the tsunami and landslides - photo James Reynolds / EarthUncut Tv

Rakata, the coast facing the anak Krakatau disfigured by the tsunami and landslides - photo James Reynolds / EarthUncut Tv

On a radar image acquired by the satellite ICEYE-X2 (the second of a battery of 5-8 satellites to be put into orbit this year), commented by Dr. Andy Hopper of the University of Leeds, we can observe " the building in the phase of construction, with a crater that is no longer in communication with the sea ".

An image of Sentinel 2 on January 8th shows the steam plume, the coloring around the volcano and the differences in vegetation of the nearby islands.

Sources: James Reynolds / EarthUncut Tv and Sentinel Satellite Image 2 and ICEYE-X2

Anak Krakatau - radar image acquired by the satellite ICEYE-X2 / 09.01.2019

Anak Krakatau - radar image acquired by the satellite ICEYE-X2 / 09.01.2019

Anak Krakatau - Sentinel 2 images from 08.01.2019 in natural colors and vegetation bands 8,4,3 - one click to enlarge
Anak Krakatau - Sentinel 2 images from 08.01.2019 in natural colors and vegetation bands 8,4,3 - one click to enlarge

Anak Krakatau - Sentinel 2 images from 08.01.2019 in natural colors and vegetation bands 8,4,3 - one click to enlarge

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