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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
Nevado del Ruiz - strong eruptive plume from 02.12.2022 (image @karolMi-twitter via Volcanodiscovery)

Nevado del Ruiz - strong eruptive plume from 02.12.2022 (image @karolMi-twitter via Volcanodiscovery)

A strong eruption took place at Nevado del Ruiz from the summit vent around 10:30 a.m. local time yesterday as suggested by observers on social media, this detail was also confirmed by Washington's VAAC.
An ash plume rose approx. altitude of 7,000 m and drifted north.
A satellite image from February 12 shows that elevated surface temperatures in the summit crater were observed. Mirova detected weak thermal anomalies of VRP 4 and 1 MW on February 12.
The alert level for the volcano remains at "yellow".

 

Sources: Servicio geologico Columbiano, Mirova, Sentinel-2 via Mounts project

Nevado del Ruiz - image Sentinel-2 bands 12,11,8A of 02.12.2022 / 3:26 p.m. - Doc. Mounts project - one click to enlargeNevado del Ruiz - image Sentinel-2 bands 12,11,8A of 02.12.2022 / 3:26 p.m. - Doc. Mounts project - one click to enlarge

Nevado del Ruiz - image Sentinel-2 bands 12,11,8A of 02.12.2022 / 3:26 p.m. - Doc. Mounts project - one click to enlarge

On February 12, 2022, an increase in the activity intensity of the Tangkuban Parahu volcano, on Java, was observed in the form of gas bursts from the Ecoma crater, which is located inside Kawah Ratu. Bursts of white gas, at moderate pressure, were observed about 100 m high from the bottom of the crater.

The gas bursts occurring are thought to be due to groundwater or water seeping below the surface, which is heated by hot rocks in the shallows below the surface of the crater and forms a accumulation of high pressure steam, resulting in "overpressure" and exits through the fracture in the weak zone, in the form of strong gusts. The dynamics of near-surface volcanic activity such as this can occur due to changes in the energy balance from internal and external factors. The internal factor comes from the vapor pressure of magma rising from the depths. External factors can come from precipitation and the rate of evaporation/evaporation.

Tangkuban Parahu - changes in internal activity in the crater on 02.11.2022 - photo PVMBG

Tangkuban Parahu - changes in internal activity in the crater on 02.11.2022 - photo PVMBG

Tangkuban Parahu - Kawah Ratu - photo PVMBG 11.02.2022 / 06:33 WIB

Tangkuban Parahu - Kawah Ratu - photo PVMBG 11.02.2022 / 06:33 WIB

The seismicity of Mount Tangkuban Parahu from January 1 to February 11, 2022 was marked by the recording of two shallow volcanic earthquakes, one low-frequency earthquake and 80 blowing earthquakes. The dominance of the blowing earthquake during this period indicates the presence of hydrothermal activity under the body of the volcano. The seismic energy as reflected by the RSAM graph (real-time seismic amplitude measurement) fluctuates and does not show an increasing trend at the end of the observation period. Observation of the deformation using Electronic Distance Measurement (EDM) showed no symptoms of inflation (bloating due to rising fluid) in the body of the volcano.

The potential danger from the current activity of Mount Tangkuban Parahu may come in the form of a sudden phreatic eruption without any obvious signs of increased volcanic activity, resulting in pyroclastic materials and high concentrations of volcanic gases around the crater. During this time, finer ash rain may cover a wider area depending on wind direction and speed.

 

Currently, the activity level of Mount Tangkuban Parahu is set at Level I (normal), with a recommendation not to descend to the bottom of Kawah Ratu and not to approach/activity around other active craters of Mount Tangkuban Parahu.

His last activity is dated from July 26 to September 17, 2019.

 

Sources: PVMBG & Global Volcanism Program - link

Sangay - 11.02.2022 / 7:59 p.m. - IGEPN webcam

Sangay - 11.02.2022 / 7:59 p.m. - IGEPN webcam

Sangay - SAGA seismic signal. 12.02.2022 / 12:12 p.m. - IGEPN

Sangay - SAGA seismic signal. 12.02.2022 / 12:12 p.m. - IGEPN

On February 12, 2022, from around 11:50 a.m. TL, the SAGA seismic station recorded seismic signals corresponding to the descent of mudslides and debris (lahars) in the Sangay volcano.

This phenomenon has been recurrent since the start of activity in May 2019 and is due to the fact that the rains in the volcano remobilize the abundant volcanic material accumulated in recent weeks. As a precautionary measure, it is recommended not to enter or approach the bed of the Sangay Norte, Culebrillas, Palora, Volcán and Upano rivers.

Low ash gas emissions were observed, with heights greater than 1000 meters above crater level in a northeasterly direction. The Washington VAAC reported gas and ash emissions up to 570 meters above the summit, in a southwest and south direction.
MIROVA reported 1 low thermal alert in the last 24 hours.

The seismicity is characterized in the last 24 hours by 96 explosion earthquakes, 32 LP earthquakes and 44 emission episodes. The alert level is at Amarilla. No ash fall report was received.

 

Source: IGEPN

The SantaMaria / Santiaguito complex - Doc. GVP

The SantaMaria / Santiaguito complex - Doc. GVP

The Santiaguito continues its activity at a high level, with a probability of generating moderate to strong pyroclastic flows.

The lava extrusion feeds two lava flows, 600 and 800 meters long, and the stacking of volcanic material in the crater, which causes avalanches mainly on the western and southwestern flanks..The ashes generated by the avalanches maintain a hazy atmosphere around volcanoes; ash falls are reported in the vicinity of San Marcos and Loma Linda Palajunoj.

Nocturnal incandescence is observed in the crater of the Caliente dome.

Mirova reports thermal anomalies on February 1 of VRP 72 MW, and on February 12 of VRP 12 MW.

The Insivumeh recommends not parking in the barrancas around Santiaguito.

 

Sources: Daily bulletin of Insivumeh & Mirova

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