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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

Activity at Sakurajima's Minamidake crater is not fading ... the JMA reported 7 explosions for November 13, 3 explosions for the 14th and 3 explosions on November 15th until 3pm.

They are accompanied by heavy ash falls on Kagoshima.

 

Sources: JMA & VAAC Tokyo

Sakurajima - activity of 12.11.2019

 Sakurajima - activity of 15.11.2019 - Doc. JMA
 Sakurajima - activity of 15.11.2019 - Doc. JMA
 Sakurajima - activity of 15.11.2019 - Doc. JMA

Sakurajima - activity of 15.11.2019 - Doc. JMA

Sakurajima - Volcanis Ash Advisory 15.11.2019 - Doc. VAAC Tokyo

Sakurajima - Volcanis Ash Advisory 15.11.2019 - Doc. VAAC Tokyo

A good image of Stromboli by the Sentinel-2 satellite this November 14 shows successive explosions (staggered plumes) and two crater areas marked by hot spots.

The analysis of the images recorded by the cameras at 400 m elevation, 190 m altitude, and Punta dei Corvi has characterized the eruptive activity of Stromboli. In its November 10 report, INGV reports on the explosive activity, which was mainly produced by at least three eruptive vents located in the area of ​​the northern crater and at least three eruptive vents located in the area of ​​the South Central crater. . All the mouths are placed inside the depression which occupies the terrace of the crater.

The thermal anomalies recorded by Mirova oscillate between 2 and 13 MW on November 13 and 14.

 

Sources: INGV OE, Mirova and Sentinel-2

Stromboli - 14.11.2019 - image Sentinel Hub bands 12,11,4 - one click to enlarge

Stromboli - 14.11.2019 - image Sentinel Hub bands 12,11,4 - one click to enlarge

In Yellowstone, the Steamboat geyser was particularly active in October with five eruptions, respectively 1, 7, 16, 22 and 30 October 2019, an explosion every 6 to 8 days, and a total of 42 episodes for this year .

Yellowstone - Steamboat geyser - activity of October 2019 - Doc. M.Poland / YVO

Yellowstone - Steamboat geyser - activity of October 2019 - Doc. M.Poland / YVO

In October 2019, seismograph stations at the University of Utah, responsible for the operation and analysis of the Yellowstone seismic network, located 193 earthquakes in the Yellowstone National Park area. The most significant event was a minor magnitude 2.9 earthquake, 16 miles southeast of Mammoth, WY, on October 16 at 11:08 am (CDT).

The October seismicity at Yellowstone included a swarm of 39 earthquakes in the area east of West Yellowstone that occurred from October 4 to 12 (HAR). On October 5 at 1842 (HA), the largest swarm, a minor 2.1 magnitude earthquake, occurred 4.5 miles east-southeast of West Yellowstone.

A second swarm of 87 earthquakes took place from October 26th to 31st (HAR). On October 26 at 9:57 am (MDT), the largest swarm, a minor magnitude 2.6 earthquake, occurred 15 miles south-southwest of Mammoth, WY.

Earthquake sequences like these are common and account for about 50% of total seismicity in the Yellowstone region.

The seismic activity of Yellowstone remains at its initial level.

 

Soil deformation in the Yellowstone area has been variable but minor in recent months.

Subsidence of the Yellowstone Caldera is indicated at stations on the Sour Creek and Mallard Lake Reservoir domes, although subsidence may have stopped in October. In the Norris Geyser Basin area, GPS data indicate subsidence of about 2 cm (less than 1 inch) since September. This collapse is the first significant deformation at Norris since October 2018, when the uprising that began in 2015 ceased.

 

The volcanic alert level remains normal and the aviation code is green.

 

Source: Yellowstone Volcano Observatory and Utah University

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