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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
Popocatépetl - explosion of 09/14/2021 / 8:45 am - Vulcanologia UNAM

Popocatépetl - explosion of 09/14/2021 / 8:45 am - Vulcanologia UNAM

 Popocatépetl - explosion of 09/14/2021 / 8:47 am - WebcamsdeMexico

Popocatépetl - explosion of 09/14/2021 / 8:47 am - WebcamsdeMexico

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 130 exhalations have been identified, probably accompanied by volcanic gases and light amounts of ash.

There were also 379 minutes of low to medium amplitude tremor.

In addition, three explosions were recorded, one moderate on 13 at 12:05, and two small on 14.09 at 08:46 and 08:59. The 8.46 am explosion was preceded by a gradual increase in degassing; the eruptive plume is minted at a height of 1,500 meters above the crater, dispersing towards Puebla.

The volcanic alert remains at Amarillo fase 2.

Last minute: an explosion is reported at 11:50 p.m., accompanied by the expulsion of incandescent fragments on the sides of the volcano and a plume of ash.

 

Sources: Cenapred / 14.09 / 11h loc. and Vulcanologia UNAM

Santa Maria - thermal anomalies at 09/14/2021 / 07:55 am - Doc.Mirova_MODIS_logVRP

Santa Maria - thermal anomalies at 09/14/2021 / 07:55 am - Doc.Mirova_MODIS_logVRP

At the Santiaguito, airplane turbine-like sounds generated by scattered degassing in the dome rising 300 meters from the Caliente dome and by gray-colored explosions dispersing in a west and south-west direction; during the night and early in the morning of September 14, they generated weak incandescent avalanches from the dome of the dome to the level of the vegetation. Ash falls are reported on the volcanic perimeter.

Due to the permanent extrusion of the material and its instability, weak and moderate debris avalanches have been observed from the dome of the Caliente dome on the western and southwest flanks; there is a likelihood that they generate moderate to strong pyroclastic flows.

Mirova reported weak thermal anomalies of 5 and 3 Mw respectively on September 13 and 14.

Fuego - lava flow and boulder avalanche in the barranca Ceniza on 09.13.2021 - Insivumeh / Landsat-8 SWIR

Fuego - lava flow and boulder avalanche in the barranca Ceniza on 09.13.2021 - Insivumeh / Landsat-8 SWIR

In Fuego, a lava flow has been observed since September 13 in the barranca Ceniza, with an approximate length of 150 to 200 meters. Mirova reports moderate thermal anomalies on September 13 and 14, between 75 and 31 MW.

Weak white fumaroles and explosions accompanied by ash have been observed at night and early in the morning in a range of 8 to 12, which rise to an approximate height of 4500 to 4700 m., dispersing in a southwest direction generating ash fall in areas close to the area. Incandescent pulses were observed rising 300 above the crater, accompanied by a faint white fumarole.

Constant avalanches of boulders were heard in the direction of the barrancas Ceniza, Taniluya, Trinidad and Santa Teresa, some of the material reached the edge of the vegetation.

 

Sources: Insivumeh and Mirova.

Kilauea, Halema'uma'u - the solidified surface of the lava lake has not changed since 03.09.2021 - photo K. Mulliken / HVO

Kilauea, Halema'uma'u - the solidified surface of the lava lake has not changed since 03.09.2021 - photo K. Mulliken / HVO

The Kīlauea volcano is not erupting. Following the recent intrusion of sub-surface magma in the area south of the Kīlauea caldera, which slowed significantly on August 30, earthquake rates and soil deformation in this area have remained close to levels of before the intrusion.

Over the past week, 13 low-magnitude earthquakes, all less than M2.5, have been detected under the Kīlauea summit region. These earthquakes occurred approximately 1 to 3 kilometers (0.6 to 1.9 miles) below ground level near Halema'uma'u. There has been no noticeable seismic activity in the vicinity of the recent intrusion; since August 30, inclinometers have not detected any substantial ground deformation in the summit region. These observations suggest that the supply of new magma to the intrusion slowed or stopped.

Other monitoring data streams, including sulfur dioxide emission rates and webcam views, show no significant change.

The surface of Halema'uma'u lava lake, which was actively erupting from December 2020 to May 2021, remains covered with a stagnant and solidified lava crust.

No unusual activity was noted in the Kīlauea East Rift area.

Current volcanic alert level: Advisory
Current Aviation Color Code: Yellow

 

Source : HVO

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