Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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, #Sismologie
Sinabung - ash plume of 27.05.2019 - Photo Magma Indonesia

Sinabung - ash plume of 27.05.2019 - Photo Magma Indonesia

The eruption of Mount Sinabung, North Sumatra, this May 27, 2019 at 06:29 WIB was accompanied by an ash plume observed at ± 2,500 m above the summit (± 4,960 m above the level of the sea). The column of ash was gray, of thick intensity and leaning towards the south. This eruption is recorded on the seismogram with a maximum amplitude of 41 mm and a duration of ± 6 minutes 24 seconds.

Currently, G. Sinabung is at level III (pending)

Source: PVMBG & Magma Indonesia

Sinabung - seismogram of 27.05.2019 - Doc. Magma Indonesia

Sinabung - seismogram of 27.05.2019 - Doc. Magma Indonesia

The Sangay in Ecuador is pursuing an explosive type activity in the central crater  and effusive type at the Ñuñurcu dome.

This May 26, one could observe from 9:15 pm a lava flow on the eastern flank, generating avalanches of blocks, accompanied by emission of gas.

In its last special report, the IGEPN informs the measurements of the lava flow of the Ñuñurcu dome: it is characterized by a length reaching 470 meters from its point of emission, and a width of 175 meters, If its average thickness is 5-10 meters, we estimate its minimum volume between 300.000 and 600.000 m³. The collapse of the lava front causes small pyroclastic flows and falling rocks.

 

Source: IGEPN

Sangay - Sentinel-2 image (RGB bands - B12; B11; B4) dated 17/05/2019, provided by Sébastien Valade (MOUNTS: http://www.mounts-project.com/volcano/352090) and map Scale 1: 50,000 of the Sangay volcano with ground interpretation of a 30 m terrain model (WGS84, Z ona 17S) (Developed by: B. Bernard / IGEPN).

Sangay - Sentinel-2 image (RGB bands - B12; B11; B4) dated 17/05/2019, provided by Sébastien Valade (MOUNTS: http://www.mounts-project.com/volcano/352090) and map Scale 1: 50,000 of the Sangay volcano with ground interpretation of a 30 m terrain model (WGS84, Z ona 17S) (Developed by: B. Bernard / IGEPN).

Sangay - photograph in the field of the visible and corresponding thermal image in the inset - a) crack associated with the emission of lava flows through the Vento "Domo Ñuñurcu". b) Active lava flow from the Ñuñurcu dome. c) Central crater and column emissions of volcanic gas. d) Pyroclastic flow derived from the collapse of the lava front. (Photo and image: M Almeida, May 17, 2019 via IGEPN)

Sangay - photograph in the field of the visible and corresponding thermal image in the inset - a) crack associated with the emission of lava flows through the Vento "Domo Ñuñurcu". b) Active lava flow from the Ñuñurcu dome. c) Central crater and column emissions of volcanic gas. d) Pyroclastic flow derived from the collapse of the lava front. (Photo and image: M Almeida, May 17, 2019 via IGEPN)

A strong earthquake of magnitude 8.0 occurred on May 26, 2019 at 7:41 UTC / 2:41 local 75 km SSE of Lagunas in Peru, felt in Ecuador, Colombia and Venezuela.

The earthquake was caused by a 64-second landslide and an extensive fracture mechanism or geometry at a depth of 140 km through a process known as " slab-pull "in the oceanic plate. of Nazca, which is subducted under the South-American plate at a rate of 43-53 mm / year. The "slab-pull" is a gravitational collapse of the coldest and densest regions of the oceanic plate (where pre-existing faults occur) as it travels to the Earth's mantle.

The energy released by the earthquake caused a displacement of about four meters in a fault line of several tens of kilometers.

According to an initial assessment provided by the Civil Defense, the earthquake killed one man, a 48-year-old man killed by the fall of a rock on his house in the district of Huarango, in the region of Cajamarca. Eleven people were injured, while 51 families were affected and 53 houses are now uninhabitable.

Sources: USGS Earthquake - EMSC - Ovsicori

Lagunas earthquake - situation and feeling map - Doc.EMSC 26.05.2019 - one click to enlarge Lagunas earthquake - situation and feeling map - Doc.EMSC 26.05.2019 - one click to enlarge

Lagunas earthquake - situation and feeling map - Doc.EMSC 26.05.2019 - one click to enlarge

Lagunas earthquake / Peru - 26.05.2019 / M 8.2 and depth 134 km - strong surface movement over the rupture zone - photo Geologia Mag

Lagunas earthquake / Peru - 26.05.2019 / M 8.2 and depth 134 km - strong surface movement over the rupture zone - photo Geologia Mag

Commenter cet article

Articles récents

Hébergé par Overblog