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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
Meradalur - 14.08.2022 - eruptive site and lava field - on the image below, the right lobe is the probable place of spillage of the lava flows towards the south - Doc. Loftmyndir ehf. / via Eldfjallafræði og náttúruvárhópur Háskóla Íslands - one click to enlarge
Meradalur - 14.08.2022 - eruptive site and lava field - on the image below, the right lobe is the probable place of spillage of the lava flows towards the south - Doc. Loftmyndir ehf. / via Eldfjallafræði og náttúruvárhópur Háskóla Íslands - one click to enlarge

Meradalur - 14.08.2022 - eruptive site and lava field - on the image below, the right lobe is the probable place of spillage of the lava flows towards the south - Doc. Loftmyndir ehf. / via Eldfjallafræði og náttúruvárhópur Háskóla Íslands - one click to enlarge

New eruption measurements at Meradalur at 14.08 – reassessed at 15.08
area covered by lava: 1.22 km² – 1.263 km²
volume of lava emitted: 10.616 million m³ – 10.990 Mm³
lava discharge: 10.4 m³/s. - 4.1 m³/s
Gas composition: mainly CO2.

(http://jardvis.hi.is/eldgos_i_meradolum)

Meradalur - USGS NASA Landsat-9 image from 08.15.2022 / 22:32 - ( Gígur - Crater / Hrauntjörn - Lava pond / Nýtt hraun - New lava / Mökkur - Eruptive plume ) via Eldfjallafræði og náttúruvárhÍpur Hásskóla Islands- one click to enlarge

Meradalur - USGS NASA Landsat-9 image from 08.15.2022 / 22:32 - ( Gígur - Crater / Hrauntjörn - Lava pond / Nýtt hraun - New lava / Mökkur - Eruptive plume ) via Eldfjallafræði og náttúruvárhÍpur Hásskóla Islands- one click to enlarge

The question asked so far: where and when will the lava pass out of Meradalur ?

Meradalur - height profile from the easternmost part of Meradala to the northern pass of the ridge that closes the valley on the eastern side as of 14.08.2022 - Doc. via Eldfjallafræði og náttúruvárhópur Háskóla Íslands - one click to enlarge

Meradalur - height profile from the easternmost part of Meradala to the northern pass of the ridge that closes the valley on the eastern side as of 14.08.2022 - Doc. via Eldfjallafræði og náttúruvárhópur Háskóla Íslands - one click to enlarge

The image above shows a height profile from the easternmost part of Meradalur to the northern neck of the ridge that closes the valley on the eastern side: the black line shows the land before the 2021 eruption , the light blue line shows the lava surface after the 2021 eruption and the red line shows the surface of new lava on August 10, 7 days after the current eruption began.

The rough surface covering most of the surface is an 'a'a flow averaging about 7-8 m, a morphology characterizing most of the volume put in place at Meradalur this week. Ahead of it is a smoother pahoehoe stream emplaced before the advance of the 'a'a flow and has been razed by it.
The upper surface of the 'a'a flow is now about 5 m. above the lowest point at the exit of the valley and therefore if the flow continues to advance, it will easily exit the valley. The question is how fast the flow would pass this point which is under debate.

The 2021 lava elevation profile on the eastern slopes of Meradalur remained unchanged until August 7, 2022, so the changes implied by the red line occurred in less than three days.

Data used in this profile comes from Loftmyndir ehf for the pre-2021 topography, fantastic work from Birgir Óskarsson, @BelartJoaquin and collaborators at the Icelandic Institute of Natural History, @Haskoli_Islands and @Landmaelingar for the post-2021 topography .
The surface of 2022 was measured by Dr Will Moreland and the @lavademics team using a @DJIEnterprise Matrice300RTK with L1 lidar.

There is a steady flow of people to the eruption site at Meradalur, up to 6,700 people on August 14, according to Tourism Board figures, and the days before at five and six thousand a day. The volunteers of the Þorbjorn rescue team are full!

 

Sources: Eldfjallafræði og náttúruvárhópur Háskóla Íslands, Dr Will Moreland, RUV, Un. Iceland

Kilauea - West vent in Halemaʻumaʻu and lava lake - photo HVO-USGS

Kilauea - West vent in Halemaʻumaʻu and lava lake - photo HVO-USGS

Lava eruption from the west vent into Kilauea's active lava lake, and on the crater floor has continued over the past 24 hours.

The active part of the lava lake showed continued surface activity. Surface activity, outside the lava lake, occurs from eruptions along the crater margins on the northeast, east, south, and west sides.

Summit tiltmeters showed a flat trend.

Volcanic tremor remains above background levels.

A sulfur dioxide emission rate of around 1,150 tonnes per day (t/d) was measured on August 12, 2022.
 

Since the beginning of this eruption on September 29, 2021, the crater floor has experienced a total elevation of approximately 136 meters. The volume of lava spilled since the start of this eruption was approximately 102 million cubic meters as measured on August 4, 2022.

 

Current volcanic alert level: Watch
Current Aviation Color Code: Orange.

 

Source: HVO

Turrialba - 14.08.2022 / 07:18 - webcam Ovsicori

Turrialba - 14.08.2022 / 07:18 - webcam Ovsicori

The latest bulletin from Ovsicori-UNA / Costa Rica mentions:

At Turrialba Volcano, park rangers reported a large crater collapse at around 8:50 a.m., which was not enough to be recorded by the seismic network. The air quality monitoring station located in Coronado has recorded an increase in the concentration of SO2 and fine particles (PM10, PM2.5 and PM1.0) since August 11. .
Activity Level: Warning (2)

Poas - 13.08.2022 - the hyperacid lake - Thermal image obtained remotely from the viewpoint of visitors to the Poás Volcano National Park on August 13, 2022, with a FLIR SC 660 portable infrared thermograph acquired by OVSICORI-UNA with FEES funds provided by the people of Costa Rica / via Maria Martinez
Poas - 13.08.2022 - the hyperacid lake - Thermal image obtained remotely from the viewpoint of visitors to the Poás Volcano National Park on August 13, 2022, with a FLIR SC 660 portable infrared thermograph acquired by OVSICORI-UNA with FEES funds provided by the people of Costa Rica / via Maria Martinez

Poas - 13.08.2022 - the hyperacid lake - Thermal image obtained remotely from the viewpoint of visitors to the Poás Volcano National Park on August 13, 2022, with a FLIR SC 660 portable infrared thermograph acquired by OVSICORI-UNA with FEES funds provided by the people of Costa Rica / via Maria Martinez

At Poas, seismic activity remains low amplitude. Gas ratios remain stable.

The temperature of the hyperacidic lake was measured remotely at 32°C on August 13. Convection cells continue to be observed. The fumaroles to the east of the lake are between 60 and 90 degrees Celsius.
Activity Level: Warning (2)

Rincon de La Vieja - gas pulse 13.08.2022 / 5:52 p.m. - Doc. Ovsicori

Rincon de La Vieja - gas pulse 13.08.2022 / 5:52 p.m. - Doc. Ovsicori

At Rincón de la Vieja, exhalations were recorded and a gas pulse could be observed at 5:42 p.m. yesterday associated with the seismic signal. A fragmented tremor is recorded.
Visibility conditions are variable, generally limited.
Activity Level: Warning (2)

 

Sources: Ovsicori & communication from Maria Martinez

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