Robin Lacassin @RobinLacassin@qoto.org

A new paper by IPGP and OVPF researchers A. Lavayssière and L. Retailleau:

Capturing #Mayotte’s deep #magmatic plumbing system and its spatiotemporal evolution with #volcano-#tectonic #seismicity

With a beautiful evaluation of #earthquake location uncertainties

https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/219

QT Hawaiian Volcano Observatory (HVO #USGS) about #MaunaLoa #volcano:

“Mauna Loa is no longer erupting. Lava supply to the fissure 3 vent on the Northeast Rift Zone ceased on December 10 and sulfur dioxide emissions have decreased to near pre-eruption background levels. Volcanic tremor and earthquakes associated with the eruption are greatly diminished […]

Spots of incandescence may remain near the vent, along channels, and at the flow front for days or weeks as the lava flows cool. However, eruptive activity is not expected to return based on past eruptive behavior.”

Their photo 👇🏼 shows channel below the volcanic vent drained of lava

https://www.usgs.gov/volcanoes/mauna-loa/volcano-updates

Conférences publiques organisées pas l'Observatoire Volcanologique et Sismologique de #Martinique (OVSM) de l'Institut de Physique du Globe de Paris (IPGP):

- Un observatoire sous-marin connecté pour déchiffrer l’activité sismique des Saintes.

- Deux ans après le passage en vigilance volcanique jaune, un point sur l’activité du #volcan la Montagne Pelée.

#volcano #Antilles #Caribbean #hazards

On 4 December, at 15:19 UTC, a strong #pyroclastic flow along the Sciara del Fuoco on #Stromboli #volcano reached the sea and generated a moderate #tsunami, hopefully not causing damage (according to INGV). Tide gauge in Ginestra recorded it with a delay of only a few minutes, and crest to crest amplitude of ~60cm.

Stromboli is an Italian very active volcano from the Aeolian islands in the Tyrrhenian sea (Mediterranean). Its activity, and more particularly hazards due to the pyroclastic flows, are monitored by INGV.

INGV reported about the tsunami: https://ingvterremoti.com/2022/12/05/stromboli-4-dicembre-2022-tsunami-si-o-tsunami-no/
And about the volcanic event itself: https://ingvvulcani.com/2022/12/05/cosa-e-successo-a-stromboli-il-4-dicembre-2022/

I like this view taken from Mauna Kea summit. Mauna Loa is in the background with the eruptive volcanic plume. From the plume ash and gazes spread horizontally in the high atmosphere.

#MaunaLoa #volcano #eruption

Amazing #USGS aerial view of the eruption on the northern flank of #MaunaLoa #volcano in #Hawaii. The main erupting fissure shows its high lava fountains in bright yellow. From there anastomosing rivers of fresh lava flow downslope and to the north. Crest and summit of Mauna Kea in the back.

From an USGS video: https://www.usgs.gov/media/videos/november-30-2022-fissure-3-mauna-loas-northeast-rift-zone-continues

Beautiful aerial views of the #MaunaLoa eruption by the #USGS Hawaiian #Volcano Observatory are here: https://www.usgs.gov/observatories/hvo/news/photo-and-video-chronology-hawaiian-volcano-observatory-november-28-2022. These USGS images are public domain.

On this image 👇🏼 , the erupting fissure with lava fountains is visible to the upper left. From the fissure reddish lava flows downslope.

Interesting National Geographic article by Robin George Andrews: "Hawaii’s #MaunaLoa erupts for the first time in 38 years. What happens next? For now, the #eruption does not threaten any populated areas, but scientists continue to closely monitor the largest active #volcano in the world."

https://www.nationalgeographic.com/science/article/hawaii-mauna-loa-erupts-largest-active-volcano-reawakens

It's dawn on the Mauna Loa #volcano summit. The USGS webcam captured daylight rising over the caldera filled by the new lava lake. Amazing view.

Updated news on the unrest: https://www.usgs.gov/volcanoes/mauna-loa/volcano-updates

Webcam on the rim of Mauna Loa summit caldera shows the lava lake that started filling up few hours ago. Last #eruption at Mauna Loa was in 1984.

#USGS Mauna Loa #volcano webcams: https://www.usgs.gov/volcanoes/mauna-loa/webcams

Updated news on the unrest: https://www.usgs.gov/volcanoes/mauna-loa/volcano-updates

More info on Mauna Loa (USGS webdoc with many maps): https://geonarrative.usgs.gov/maunaloa/

In a recent Science paper, Proud et al. estimated that the Hunga Tonga-Hunga Ha’apai volcanic plume reached an altitude of 57km "well past the stratosphere and into the mesosphere and higher than any volcanic plume previously recorded".

They used geostationary weather satellite imagery. The different satellites recorded the #volcano eruption with multiple viewing geometries. This allowed the researchers to compute plume altitude based on the parallax effect.

https://www.science.org/doi/10.1126/science.abo4076

NIWA also made an excellent video explaining their research on the Hunga-Tonga Hunga-Ha'apai #volcano.

https://youtu.be/xYhCEeIO25k

New Zealand's National Institute for Water and Atmospheric Research (NIWA) press release about January Hunga-Tonga #volcano eruption. https://niwa.co.nz/news/tonga-eruption-confirmed-as-largest-ever-recorded

"Hunga-Tonga Hunga-Ha'apai (HT-HH) emitted the biggest atmospheric explosion recorded on Earth in more than 100 years (…) almost 10km3 of seafloor was displaced (…) the caldera, or crater, is now 700m deeper than before the eruption."

"NIWA scientists have also unravelled one of the biggest unknowns of the eruption – the pyroclastic flows (…) Samples showed [underwater] pyroclastic deposits [at least] 80km away from the volcano."

Few months ago, together with @RaphaelGrandin and J.M. Lalande from MeteoFrance, I participated as a scientific advisor to the making of this amazing scientific illustration 👇 #scicom #sciart

It summarizes scientific observations on the Hunga #Tonga #volcano explosion, associated global #tsunami and atmospheric waves.

French newspaper Le Monde published these 2 pages in September 2022. Great work by the journalist and the graphic designer, Vahé Ter Minassian and Audrey Lagadec.

DM if you would like a higher resolution PDF 😉