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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

Dec 16 2018 - A new fissure has opened up on Ambrym Island. Recorded by John Tasso

The Vanuatu Geohazards Observatory has raised the volcanic alert level of the Ambrym / Vanuatu volcano to 3 / minor eruption.

Observations and analysis of seismic data confirm a flank eruption in the caldera near the crater Marum this December 15 from 6am. The activity consists of lava flows and lava fountains, with emissions of gas and ash, visible and audible by the population of Ambrym and neighboring islands.

The security zone is 2 km around Benbow and 4 km around the Marum, including the three active lava lakes, where volcanic gases and ashes can be present in abundance. The villages north and northwest of Ambrym are particularly exposed.

 Ambrym / Marum - 15.12.2018 / 7h - VMGD webcam

 Ambrym / Marum - 15.12.2018 / 7h - VMGD webcam

Ambrym - Benbow & Marum drum plot of 15.12.2018 - Doc. GMVD

Ambrym - Benbow & Marum drum plot of 15.12.2018 - Doc. GMVD

Ambrym - danger zones for Benbow and Marum volcanoes - Doc. VMGD 15.12.2018

Ambrym - danger zones for Benbow and Marum volcanoes - Doc. VMGD 15.12.2018

VAAC Wellington is issuing a notice of visible ashes and ashes falling as a result of a confirmed intermittent fissure eruption .

Volcanic Ash Advisory
DTG: 20181215 / 1837Z
VAAC: WELLINGTON
VOLCANO: AMBRYM 257040
PSN: S1615 E16807
AREA: VANUATU
SUMMIT ELEV: 1334M
ADVISORY NR: 2018/5
SOURCE INFO: SATELLITE, GEOHAZARDS
AVIATION COLOR CODE: UNKNOWN
ERUPTION DETAILS: CRACKING ERUPTION CONFIRMED IN MARUM CRATER
OBS VA DTG: 15 / 1818Z
OBS VA CLD: SFC / FL200 S1615 E16800 - S1630 E16815 - S1615
        E16900 - S1530 E16830 MOV NE 10KT
FCST VA CLD +6 HR: 16 / 0018Z SFC / FL200 S1630 E16815 - S1600
        E16930 - S1500 E16845 - S1615 E16800
FCST VA CLD +12 HR: 16 / 0618Z SFC / FL100 S1630 E16815 - S1600
        E16930 - S1500 E16845 - S1615 E16800
FCST VA CLD +18 HR: 16 / 1218Z SFC / FL100 S1630 E16815 - S1600
        E16930 - S1500 E16845 - S1615 E16800
RMK: INTERMITTENT ERUPTION. ASH VISIBLE IN SATELLITE IMAGERY
        AND ASHFALL CONFIRMED BY LOCAL OBSERVATIONS. HEIGHT
        ESTIMATED FROM 15 / 12Z NOUMEA SOUNDING
NXT ADVISORY: NO LATER THAN 20181216 / 0037Z

Ambrym - Volcanic ash advisory fou 15-16.12.2018 - VAAC Wellington

Ambrym - Volcanic ash advisory fou 15-16.12.2018 - VAAC Wellington

The amounts of sulfur dioxide found by Sentinel 5P / Tropomi satellite are very high, over 600 Dobson units near the eruptive site (via Simon Carn)

Sources:

-Vanuatu Meteorology and Geohazards Department,

- VAAC Wellington

- Sentinel 2 and Landsat 8 images

 Ambrym - SO2 flux - Sentinel SP Tropomi 16.12.2018 / 2h29 - via Simon Carn

 Ambrym - SO2 flux - Sentinel SP Tropomi 16.12.2018 / 2h29 - via Simon Carn

Ambrym - image Sentinel-2 image bands 12,11,4 of 15.12.2018 - one click to enlarge

Ambrym - image Sentinel-2 image bands 12,11,4 of 15.12.2018 - one click to enlarge

Ambrym - Landsat image 8 image bands 9,7,4 from 15.12.2018 - one click to enlarge

Ambrym - Landsat image 8 image bands 9,7,4 from 15.12.2018 - one click to enlarge

This Saturday, December 15, 2018 from 17:00 WITA, the seismic data of Soputan / North Sulawesi, indicate a rapid and significant increase. The seismicity continues to increase then and on Sunday, December 16, 2018 at 01:02, an earthquake occurs with a maximum amplitude of 40 mm (oversized) with a duration of 598 seconds, accompanied by thunderous sounds heard until the observation post of the volcano Soputan located in Silian Raya (about 10 km southwest of G. Soputan). The height of the eruption column is not observed because it is covered with fog.

Soputan - 16.12.2018 - Magma Indonesia pictures

Soputan - 16.12.2018 - Magma Indonesia pictures

On Sunday, December 16, 2018, at approximately 3:09 am, incandescent emissions above the summit of Gunung Soputan were observed, accompanied by an eruptive column at ± 3,000 m above the summit (± 4,809 m above sea level). from the sea), gray and thick inclined to the southeast.

At 0540, the gray and thick ash column was ± 7000 m above the summit (± 8 809 m above sea level), extending to the southeast.

A VONA was published twice on December 16, 2018: at 04:00 WITA with color code ORANGE and at 5:54 WITA with a color code RED. Until now, continuous tremor continued to be recorded with the maximum amplitude (overshoot) indicating that the eruption activity was still in progress.

The status of G. Soputan is still at Level III (Alert) with a danger zone, which is a 4 km radius and a sectoral expansion southwest of 6.5 km.

The population around the volcano is encouraged to prepare masks of protection for the mouth and nose to avoid the potential danger of volcanic ash for the respiratory system. Drainage residents upstream of Soputan should be aware of the potential threat of lahars, especially during the rainy season.

Source : Magma Indonesia 
 

Soputan - 16.12.2018 - photo Steyve Marapi, via Shérine France

Soputan - 16.12.2018 - photo Steyve Marapi, via Shérine France

Soputan - 16.12.2018 - photo Edwin L Raranta, via Shérine France

Soputan - 16.12.2018 - photo Edwin L Raranta, via Shérine France

 Soputan - photo from the observation post of Soputan (PGA) 16.12.2018  / 07:13 WITA

Soputan - photo from the observation post of Soputan (PGA) 16.12.2018 / 07:13 WITA

On December 10th, the lava emission by the intracaldeira cone from Veniaminof, in the Alaskan Peninsula, stopped, although explosive activity still occurs. Until December 13, there is no evidence of eruptive activity observed on the webcam and satellite images.

On Thursday, December 13th, the tremor reappeared intermittently, gradually becoming continuous. Since then, a plume has been observed and more vigorous activity has resumed, given the high temperatures recorded by the webcam and satellites, consistent with fountaining.

Sources: AVO and Mirova

Veniaminof - RSAM from 8 to 15.12.2018 - Doc. AVO

Veniaminof - RSAM from 8 to 15.12.2018 - Doc. AVO

Veniaminof - thermal anomalies at 15.12.2018 / 23.30 - Doc. Mirova MODIS_Latest10NTI

Veniaminof - thermal anomalies at 15.12.2018 / 23.30 - Doc. Mirova MODIS_Latest10NTI

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