[ACTUEEL] Vulkanen op de Canarische Eilanden #8

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Op dinsdag 21 december 2021 14:25 schreef puzziepie het volgende:

Drone footage shows a clear view of La Palma's craters after volcano goes silent

Is het nu écht klaar?

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Earthquake swarm detected in Tenerife’s Las Cañadas caldera, Spain

Between 23:42 UTC on May 27 and 04:08 UTC on May 28, 2024, the Canary Seismic Network detected a seismic swarm in Tenerife’s Las Cañadas caldera, consisting of dozens of small earthquakes, with 26 located.

The swarm consisted of dozens of small earthquakes, with 26 of these earthquakes having been precisely located. The earthquakes had magnitudes reaching up to 1.2 and occurred at depths between 5 and 10 km (3.1 to 6.2 miles).

Since June 2017, there has been a notable increase in micro-seismicity within Tenerife, characterized by 113 low-magnitude seismic swarms, including three hybrid seismic events.

This increase is attributed to a pressurization process of the volcanic-hydrothermal system, likely linked to the injection of magmatic gases, according to INVOLCAN.

The map provided by INVOLCAN shows the recent seismic swarm’s epicenters in red, with the seismic activity of the past year depicted in gray.

Despite this increase in seismic activity, INVOLCAN volcanologists emphasized that there is no immediate danger to the population, nor does this activity indicate an increased likelihood of a volcanic eruption in the short or medium term.

Tenerife, the largest of the Canary Islands, features a complex of overlapping Miocene-to-Quaternary stratovolcanoes.

The Las Cañadas caldera, a 10 x 17 km (6.2 x 10.5 miles) structure partially filled by the Teide stratovolcano, has been formed through collapse due to major explosive eruptions, massive landslides, or a combination of both. The most recent volcanic activity includes the construction of the Pico Viejo and Teide edifices, with historical eruptions possibly observed by Christopher Columbus.

The Teide volcano, located within the Teide National Park, a UNESCO World Heritage property, remains closely monitored.

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Increased volcanic activity detected at Mount Teide, no imminent eruption risk, Tenerife

The Scientific Committee for the Evaluation and Monitoring of Volcanic Phenomena (CCES) has confirmed that the Teide volcano in Tenerife, Spain is exhibiting anomalous geophysical activity, characterized by increased seismicity, geodetic deformation, and gas emissions. While there are no indications of an imminent eruption, experts acknowledge an elevated likelihood of volcanic activity in the medium to long term.

Since 2016, monitoring networks have recorded gradual yet persistent geophysical changes beneath Teide, with a marked intensification of activity since 2022. Key indicators, including seismic swarms, ground deformation, and variations in gas emissions, suggest increasing pressurization within the hydrothermal system underlying the stratovolcano.

Of particular note is the correlation between altered fumarolic emissions and seismic activity concentrated around Las Cañadas, Cumbres de Adeje, and Vilaflor. In addition, over the past week, a localized seismic cluster near Vilaflor has generated at least 14 earthquakes within a 24-hour period.

The Canary Islands Volcanology Institute (Involcan), the Spanish National Research Council (CSIC), and the Directorate General of Emergencies are actively analyzing these developments, refining hazard models, and enhancing surveillance strategies.

In June and July 2023, a significant cluster of deep-seated earthquakes was detected near Santiago del Teide at depths exceeding 30 km (18.6 miles), indicative of magmatic or hydrothermal system adjustments. Later in 2023, another seismic sequence occurred beneath Las Cañadas, with focal depths ranging from 17 to 23 km (10.5 to 14.3 miles). Smaller swarms have also been documented under Izaña and the peaks of Arico, highlighting the complexity of the volcanic system.

Geodetic measurements suggest subtle yet measurable ground deformation, reinforcing the hypothesis of increased pressurization. Although these indicators do not currently imply magma migration toward the surface, they warrant continued scrutiny to assess potential changes in the system’s behavior.

The Canary Islands government remains vigilant, maintaining operational readiness through the Special Civil Protection and Emergency Plan for Volcanic Risk (PEVOLCA). While there is no immediate hazard to the population, authorities stress the importance of continuous monitoring and public awareness.

Residents and visitors are advised to stay informed through official updates and adhere to any guidance provided by emergency management agencies, particularly in regions experiencing heightened seismic activity.

The government said it will make the scientific committee’s findings publicly accessible through the Territorial Policy Department’s website.