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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, #Tectonique
Merapi - fall of incandescent rocks on 14.01.2019 / 02:13 local - photo Øystein Lund Andersen

Merapi - fall of incandescent rocks on 14.01.2019 / 02:13 local - photo Øystein Lund Andersen

At Merapi / Java, incandescent rock falls were observed six times on 13 January between 19:50 and 21:21 BST towards the Gendol River, lasting from 35 to 86 sec. The falls are repeated on January 14 at 2:13 local.

On January 12th, we can point the rock falls at 9:13 pm, on 400 m. approximately and at 21:16, on 1,500 m. lasting 126 sec.

The volume of the dome on January 13 reached 439,000 m³, with a growth rate of 3,400 m³ / day

 

Source: PVMBG

Merapi - dome growth on 13 January 2019 - Doc. PVMBG

Merapi - dome growth on 13 January 2019 - Doc. PVMBG

In the Moluccas, the Gunungapi Ibu on the island of Halmahera in activity level 2 / waspada, has ash plumes between 200 and 800 meters above the crater.

The seismicity of January 13 is declined between 70 eruptive earthquakes, 69 breath earthquakes, 21 earthquakes of collapse, 10 episodes of tornilo, and 13 of harmonic tremor.

An orange VONA has been in effect since January 13 at 8:01 am WIT, following the observation of an ash plume 800 meters above the summit (2.125 m asl) moving south.

Despite the regular weather coverage, moderate thermal anomalies were recorded by Mirova: from 20 MW on 11.01 and 16 MW on 13.01.2019

 

Sources: PVMBG, Magma Indonesia, Mirova

 Gunung Ibu - Sentinel image-2 SWIR image from 06.01.2019

Gunung Ibu - Sentinel image-2 SWIR image from 06.01.2019

Gunung Ibu - 13.01.2019 ash plume - photo Bencana ID

Gunung Ibu - 13.01.2019 ash plume - photo Bencana ID

Gunung Ibu - seismicity on 13.01.2019 - Doc. Magma Indonesia

Gunung Ibu - seismicity on 13.01.2019 - Doc. Magma Indonesia

A seismic swarm occurred on January 13, from 2:50 UTC, southwest of Santorini, in the Cyclades, between the volcano and the group of Christiana Islands.

The earthquakes have a magnitude between 2 and 3.9 and a hypocenter located between 6 and 30 km.

The strongest earthquake is M 3.9, at 8:26 UTC and a depth of 17 km. (EMSC)

Although close to the Kameni Line, there is no indication to link them to volcanic activity. These tectonic earthquakes remain under monitoring, due to the tourist frequentation of this natural, volcanologically active site.

 

Sources: HHN; EMSC

Santorini - seismogram of 13.01.19 / HTT and location of the epicenters at SW of Santorini / EMSC
Santorini - seismogram of 13.01.19 / HTT and location of the epicenters at SW of Santorini / EMSC

Santorini - seismogram of 13.01.19 / HTT and location of the epicenters at SW of Santorini / EMSC

Caldera of Santorini - Nea Kameni, seen from Fira - ESA photo

Caldera of Santorini - Nea Kameni, seen from Fira - ESA photo

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