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
Popocatépetl - emissions and hot spot from 28.11.2019 - Sentinel-2 L1C image bands 12,11,4

Popocatépetl - emissions and hot spot from 28.11.2019 - Sentinel-2 L1C image bands 12,11,4

At Popocatépetl, 148 exhalations were identified during the last 24 hours, accompanied by water vapor, gas and sometimes ash in small to moderate amounts. The most relevant ones were recorded today at 8:19, 9:14 and 9:47.

Similarly, 315 minutes of tremor were recorded.

An explosion occurred on November 28 at 2:33 am, accompanied by a column of ash about 1000 m above the crater, which moved to the northwest.

Meanwhile, there has been a continuous emission of gas and small amounts of ash scattered to the northwest by the prevailing winds, also visible on the image of the Sentinel2 satellite.

Alert level remains at Amarillo Fase 2

 

Sources: Cenapred, Proteccion Civil and Sentinel 2

Popocatépetl - explosion of 28.11.2019 / 02:34 - webcams from Mexico / Cenapred

Popocatépetl - explosion of 28.11.2019 / 02:34 - webcams from Mexico / Cenapred

In Costa Rica, seismic activity continued at Rincon de la Vieja with the appearance of long-term signals (about two dozen) and two volcano-tectonic signals, the two types of signals recorded in most stations near of the volcano.

The spasmodic tremor has decreased in amplitude as of October 31 and continues to this day.

On 19 November, the installation of a GPS / GNSS precision station, for monitoring the cracks in the southern flank of the active crater, was finalized.

The RSN teams, in collaboration with Francisco Muñoz from OVSICORI, took thermal photographs of the fumaroles located in the western sector of the active crater and the acidic lake. The maximum temperature recorded in the fumaroles was 93°C, and 32°C in the lake.

Rincon de La Vieja - the acid lake and the new GPS station - RSN photo

Rincon de La Vieja - the acid lake and the new GPS station - RSN photo

In Poas, the crater lake maintained its surface area compared to the previous week.

The color of the water tends to be greenish. Evaporation processes were a little more intense than the previous week and rainfall decreased. The field of sulfur-rich fumaroles in the northeast maintains its exhalation activity. At the mouth A, bubbling and emission of gas were observed.

At the seismic level, the tremor of small amplitude was maintained (2 to 4.5 Hz), as well as discrete events of type LP (long duration) of low amplitude.

Visitors to the Poás Volcano National Park are reminded that this site has protocols for eruptions.

 

During the day of November 28, when it was raining heavily, the lagoon was observed with a coffee color due to the entry of the sediments transported by the water. In the upper photo, taken in the afternoon, the lake had already recovered its greenish color.

 

Sources: Ovsicori and RSN / weekly report.

Poas - lake color changes on 28.11.2019 - webcam photos respectively at 8:58 and 16:03 / RSN

Poas - lake color changes on 28.11.2019 - webcam photos respectively at 8:58 and 16:03 / RSN

The effusive activity of Fuego in Guatemala is on the rise; the night and early morning glow is completed by the observation of moderate thermal anomalies, included in recent days between 18 and 91 MW, according to Mirova.

The seismic tremor, associated with the rise of the magma that feeds the lava flows, has been maintained in duration and amplitude.

The active lava flow in the direction of the Ceniza barranca is about 600 meters, with avalanches and steam at the head of the stream. If the effusion ratio continues to increase, new flows may occur in other drainages.

At the same time, moderate gas and ash emissions are observed.

 

Source: Insivumeh 28.11.2019 12:30 local report, Mirova & Sentinel 2

Fuego - hot point of the lava effusion on 26.11.2019 - Sentinel-2 L1C image bands 12,11,4

Fuego - hot point of the lava effusion on 26.11.2019 - Sentinel-2 L1C image bands 12,11,4

Fuego - thermal anomalies on 29.11.2019 - Doc. Mirova_MODIS_Latest10NTI

Fuego - thermal anomalies on 29.11.2019 - Doc. Mirova_MODIS_Latest10NTI

Commenter cet article

Articles récents

Hébergé par Overblog