Posted by Timon.:. | Fri, September 17, 2021 | News | 0 |
The Canarian Seismic Network managed by the Volcanological Institute of the Canary Islands (Involcan) was able to discover more than 20,650 earthquakes in the Cumbre Vieja volcano on the island of La Palma on Friday, September, between 1:00 a.m. (Canarian time) 10 briefly before the start of this last event and 19:00 (Canary time) this Thursday evening.
The director of the Spanish National Geographic Institute (IGN) in the Canary Islands, María José Blanco, said this Friday morning that the volcano Cumbre Vieja on La Palma is « very energetic », but also less explosive than both, Teneguía, which last erupted exactly 50 years ago in October and November 1971 and San Juan in 1949, but in just four days the Cumbre Vieja has the same Amount of energy released that was produced two months ago during the recent submarine volcano Tagoro off the coast of El Hierro ten years ago, in 2011.
In a Europa Press beric Had an interview with “Radio Canarias”, Blanco commented that due to the development of seismic processes that they monitor, a daily estimate of the magnitudes is made and “it cannot be ruled out” that “stronger” earthquakes over the coming days or weeks.
She said it was « absolutely unpredictable » whether an eruption will occur, when and where it might come from, and although she admitted that « concerns about the effects of a volcanic eruption are growing, » she sees the situation from hers Visibility must be seen as part of the « normality » of the Canary Islands as a volcanically active archipelago.
Blanco pointed out that, unlike previous volcanic eruptions on the island, the population has « more information and more training » about what is happening and « there is no surprise » when a process of this type is triggered, although previous such episodes were entirely possible, ended in twenty or more deaths.
» Many died out of fear, « she said, not being aware of the existence of a seismic volcanic crisis.
Blanco described the current process as » an entry of igneous material that fills the pores, melts them and penetrates them « and when it does eventually erupt, there will be more material, although she also stressed that “it doesn’t have to erupt either. «
Indeed, » knowing if the crust breaks is the million dollar question, « she said, recalling that there was a lot of seismicity, lots of energy release events and lots of deformation on El Hierro, » but they didn’t last at ». long and did not reach the surface. ”
On El Hierro, seismic activity began in the El Golfo Valley, but the eruption ended south and into the sea. « It has progressed tens of kilometers », she commented.
She also said that « it cannot be ruled out » that the volcanic process that began on La Palma « will last for many months » because the islands are active volcanic terrain and there will be more eruptions « in the future ». « They can be extended, they can be very short, the situation has to be normalized, » she stressed.
The Scientific Committee for the Special Plan for Civil Protection and Attention to Volcanic Risks Emergencies (PEVOLCA) met this Friday and confirmed a decline in seismic activity, but insisted that the scenario could be temporary and that no interruption of the volcanic eruption implied reactivation.
They recommended the management, in the area of Cumbre Vieja, on La Palma, in the municipalities of Fuencaliente, Los Llanos de Aridane, El Paso, and Mazo maintain a Yellow Alert Condition to intensify their surveillance and surveillance duties. The Scientific Committee as well as the Steering Committee will meet again this Saturday.
In their report they indicate that a significant decrease in seismic activity has been observed in the last few hours, although a pulse of remarkable intensity with localized events in both Depths of 6-8 km as well as on the surface were recorded. Today’s seismicity is NE of that of the previous day. It is found that shallow seismicity prevails. The deformation continues at a slower rate, which is compatible with a more superficial source of deformation.
The process continues and can develop rapidly in the short term. The decrease in seismicity can be temporary and does not necessarily mean an interruption in volcanic reactivation.
As indicated in your previous bulletin, perceived earthquakes of greater intensity are expected to occur. The beginning of observable phenomena on the surface cannot be ruled out.
The Scientific Committee has also commented on the decision of some news media to investigate the alleged probability of a major collapse of the western flank of Cumbre Vieja with the subsequent formation of a « mega-tsunami » by simply indicating that there is no data to support this hypothesis and that it lacks any proven scientific basis.
The Scientific Committee is coordinated and composed of the Directorate-General for Security and Emergencies of the Government of the Canary Islands Representatives of the National Institute of Geography (IGN), the Superior Council for Scientific Research (CSIC); The Volcanological Institute of the Canary Islands (Involcan), the Geological and Mining Institute of Spain (IGME), the State Meteorological Agency (AEMET), the Spanish Institute of Oceanography (IEO), the University of La Laguna and the University of Las Palmas de Gran Canaries.
PEVOLCA also studied evacuation plans with the La Palma Cabildo this Friday in order to prepare for further developments
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