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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 : #Actualités volcaniques
 Sierra Negra - 06.08.2018 - photo Carolelynn / Twitter

Sierra Negra - 06.08.2018 - photo Carolelynn / Twitter

On Isabela in the Galapagos, the eruption of Sierra Negra continues: despite a cloud cover during the night, an incandescence was visible on August 7 at 19h local. On August 9, at 17:45 GMT, the tremor increased in amplitude, in relation with a new surge of activity on the northern flank.

Seismicity is further characterized by 52 volcano-tectonic earthquakes, and 6 LP earthquakes.

The largest earthquake occurred at 10:55 am M3,1 TG and a depth of 2 km.

Source: IGEPN

Sierra Negra - thermal anomamy is considered "extreme" this 09.08.2018 at 7:35 am by Mirova Modis
Sierra Negra - thermal anomamy is considered "extreme" this 09.08.2018 at 7:35 am by Mirova Modis

Sierra Negra - thermal anomamy is considered "extreme" this 09.08.2018 at 7:35 am by Mirova Modis

Sierra Negra - zoom / B.Duyck on a Sentinel 2 image of 02.08.2018, at the last "discovered" passage of the satellite

Sierra Negra - zoom / B.Duyck on a Sentinel 2 image of 02.08.2018, at the last "discovered" passage of the satellite

At Kilauea, no signs of reactivation or re-intrusion on the East Rift Zone.

The cone on the fissure 8 presents a small encrusted lava lake, and degasses strongly. The channeled flow is covered with a crust

The other fissures also degassed on August 9: on the upper course, fissures 8, 9, 10 and 24; on the lower course, fissures 13, 23, 3, 21 and 7.

The lava entries at sea remain active and numerous, and create small plumes of laze

Pohoiki is "still standing", but surrounded by lava. The casting approaches the parking area, and by the sea, the black sand covered the tip to the end of the pier ... the boat ramp remains usable at the time of the morning flyover. For how much longer ?

The summit area remains calm ... and the deformation measured by GPS and tiltmeters has stopped.

The monitoring of Kilauea continues, pending changes in activity.

Sources: HVO-USGS, Bruce Omori and Micl Kalber.

Kilauea East rift zone - The lava surrounds the Pohoiki boat ramp - USGS photo

Kilauea East rift zone - The lava surrounds the Pohoiki boat ramp - USGS photo

In Lombok, the phenomenon of soil liquefaction has been noted on Rinjani, in connection with the M7.0 earthquake.

It is due to a loss of structure due to seismic vibrations which results in a resurfacing, in the form of fine-grained sandy mud emerging from cracks in the ground.

The provisional earthquake record is on the rise, with the latest news being 259 killed, 1,033 hospitalized, and 270,168 displaced. The most affected districts are located northwest and west of the island.

Sources: Magma Indonesia, PVMBG, BMKG & BNPB

Rinjani - soil liquefaction in connection with earthquakes - photo PVMBG / Magma Indonesia
Rinjani - soil liquefaction in connection with earthquakes - photo PVMBG / Magma Indonesia

Rinjani - soil liquefaction in connection with earthquakes - photo PVMBG / Magma Indonesia

Lombok - number of earthquakes (main and replicas 451) between 5 and 10 August 2018 / 08h loc. - Doc. BMKG

Lombok - number of earthquakes (main and replicas 451) between 5 and 10 August 2018 / 08h loc. - Doc. BMKG

Lombok - Provisional assessment of earthquakes at 9 August / 1 pm WIB, likely to be revised upwards - Doc BNPB

Lombok - Provisional assessment of earthquakes at 9 August / 1 pm WIB, likely to be revised upwards - Doc BNPB

During the last ten days, two major outbreaks of the number of earthquakes are noted under Katla, covered by the ice cap of Myrdalsjökull. The strongest earthquakes are located at shallow depths.

The activity of Katla does not show anything particular.

Source: IMO / Vedurstofan

Myrdalsjökull - seismicity on 09.08.2018 - Doc IMO
Myrdalsjökull - seismicity on 09.08.2018 - Doc IMO

Myrdalsjökull - seismicity on 09.08.2018 - Doc IMO

Myrdalsjökull - table of the seismicity of the last fortnight / at 09.08.2018 - doc. Vedurstofan

Myrdalsjökull - table of the seismicity of the last fortnight / at 09.08.2018 - doc. Vedurstofan

A small summary of Krakatau 's activity on 4-6 August ... about fifty images, to be seen on the big screen, on the Oystein Lund Andersen website - 

http://www.oysteinlundandersen.com/krakatau-volcano/krakatau-volcano-eruption-4-6-august-2018/

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