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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

Yesterday, October 28 at 9:43, a notice of ash dispersion was issued for Sabancaya by IG Peru; it concerns a radius of more than 20 km around the volcano, and particularly the western and southwestern sectors.

 Sabancaya - other ash emissions during the day testify to the permanent activity of the volcano - webcam Ingemmet 28.10.2019 / 12h06

 Sabancaya - other ash emissions during the day testify to the permanent activity of the volcano - webcam Ingemmet 28.10.2019 / 12h06

Ingemmet, through its Vulcanological Observatory (OVI), revealed the same day the presence of a large lava dome in the crater of Sabancaya volcano. The dome filled much of the northern sector of the crater, with an area of ​​approximately 50,000 m².

The recording was made possible by the overflight of the drone over the massive crater carried out by a field brigade of the Vulcological Observatory of Ingemmet (OVI) on October 26, 2019.

Sabancaya - the dome occupies a large part of the northern sector of the crater - drone flyover photo uploaded by the OVI on 28.10.2019

Sabancaya - the dome occupies a large part of the northern sector of the crater - drone flyover photo uploaded by the OVI on 28.10.2019

Sabancaya - the dome occupies a large part of the northern sector of the crater - drone flyover photo uploaded by the OVI on 28.10.2019

Sabancaya - the dome occupies a large part of the northern sector of the crater - drone flyover photo uploaded by the OVI on 28.10.2019

Analysis of the satellite images allowed us to establish that the lava dome began to be located since February 2017, at relatively low rates. Subsequent satellite images (June 2017, September 2018, May and October 2019) show the growth of this dome, which has accelerated in recent months.

According to the latest estimates, the lava dome has about 4.6 million cubic meters. At the same time, volcanic explosions emitting mainly gases and ashes were recorded.

Ingemmet, through geological studies and constant volcanic monitoring, indicates that between December and March, during the heavy rains, lahars (mudslides) would be generated in the main ravines and rivers adjacent to the volcano, some of which even reach the valley of Colca.

 

With regard to the lava body in the crater of the Sabancaya volcano, these are the possible scenarios in the future:

a) that a moderate explosive activity (vulcanian) continues, with emissions of gas, ashes and ballistic missiles, a parallel growth of the lava dome until completely filling the crater;

(b) more intense explosive activity with generation of low to moderate pyroclastic fluxes, which would mainly descend to the north, north-east and southeast flanks, reaching a maximum distance of 12 km;

(c) generation of short-range lava flows down the northern, north-east and south-east flanks.

It is recommended to maintain the ORANGE volcanic warning level and not to approach the volcano, within 12 km radius of the crater. It is also recommended that the authorities and the endangered population execute contingency plans based on Sabancaya volcano hazard maps in order to keep abreast of Ingemmet reports.

 

Sources: IG Peru, Ingemmet and OVI

Anak Krakatau - phreatic / phreatomagmatic activity from 29.10.2019 / 10h52 - Doc.PVMBG

Anak Krakatau - phreatic / phreatomagmatic activity from 29.10.2019 / 10h52 - Doc.PVMBG

An eruptive episode is reported on October 29 at 10:49 WIB at Anak Krakatau. It left a seismographic imprint with a maximum amplitude of 41 mm and a duration of 297 seconds. It is noted in addition on the images of the webcam.

The VONA is orange

 

Sources: PVMBG and VAAC Darwin

Yasur - comparison between the images of 25 and 27 October 2019, illustrating the internal landslide - image: Justin Noonan, via Volcanodiscovery

Yasur - comparison between the images of 25 and 27 October 2019, illustrating the internal landslide - image: Justin Noonan, via Volcanodiscovery

The latest activity report of the Vanuatu Geohazard Observatory indicates permanent instability in Yasur, in alert level 2, on the island of Tanna in Vanuatu. The explosions remain confined to the crater, with bombs falling in and sometimes around the crater and emanations of ash and gas. The danger zone remains fixed at 395 meters around the eruptive vents.

 

A significant landslide, concerning the eastern edge of the northern crater, under point of view # 5, is reported by Justin Noonan; it specifies that the small lake of lava, observed the 24-26 of October in one of the vents, was covered by the materials of the slip on October 27 (photos via the site Volcanodiscovery)

 

Sources: VGO, Volcanodiscovery and Justin Noonan

Teide / Canaries - installation areas of the thermal measurement network, one of the authors busy installing a probe and diagram of the probe - Doc. Multi Teide & MDPI - one click to enlarge thumbnails
Teide / Canaries - installation areas of the thermal measurement network, one of the authors busy installing a probe and diagram of the probe - Doc. Multi Teide & MDPI - one click to enlarge thumbnailsTeide / Canaries - installation areas of the thermal measurement network, one of the authors busy installing a probe and diagram of the probe - Doc. Multi Teide & MDPI - one click to enlarge thumbnails

Teide / Canaries - installation areas of the thermal measurement network, one of the authors busy installing a probe and diagram of the probe - Doc. Multi Teide & MDPI - one click to enlarge thumbnails

The first lora-based, low-power, low-power wireless network was developed to monitor soil temperature in areas of thermal anomalies in volcanic areas. LoRa technology is one of the most popular LPWANs and allows long-range communications with very low power consumption.

The network was installed on November 20, 2018 in Las Cañadas del Teide in Tenerife (Spain), the thermometers distributed between zones a and b, where are the main thermal anomalies. The network continues to work. The recorded temperature values ​​correspond to the previous data reported by the MultiTeide project. Thus, proper temperature monitoring is guaranteed by the developed wireless network.

 

Sources: Multi Teide & MDPI - An Internet of Things (IoT) Application on Volcano Monitoring - by Sh. Awadallah, D.Moure and P.Torres-Gonzalez.

The full article by following this link: https://www.mdpi.com/1424-8220/19/21/4651/htm

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