Alert raised over quake surge around Canaries volcano

Experts were keeping a close watch Thursday on a volcano in Spain's Canary Islands which last erupted 50 years ago after observing an upsurge in seismic activity and magma displacements.

The earthquake swarm under La Cumbre Vieja on La Palma island began on Saturday and since then, there have been almost 1,000 tremors, the strongest with a magnitude of 3.4, the Involcan vulcanology institute said.

An earthquake swarm is a sequence of seismic events occurring in one place within a relatively short period of time.

"An intensification of the type of seismic activity in the coming days cannot be ruled out," it said.

The Spanish government's office in the Atlantic archipelago said the situation "could change quickly in the short term" but stressed there was "no clear evidence that suggested an eruption was imminent".

Cumbre Vieja is an active although dormant volcanic ridge in the south of La Palma that has erupted twice in the 20th century, first in 1949 then in 1971.

The authorities had on Tuesday raised the alert level from green to yellow, the second of four levels, in certain areas around the volcano, meaning civil protection officials must inform the public "to take precautions ahead of a possible volcanic eruption", the Pevolca emergency plan says.

Involcan said all of the quakes had been shallow, and a "significant ground deformation" as a result of "a small volume" of new magma flowing into the reservoir underneath the volcano, which amounted to 11 million cubic metres.

"Undoubtedly the current seismic swarm represents a significant change in the activity of the Cumbre Vieja volcano and is related to a process of magmatic intrusion beneath the island of La Palma," it said.

Related Links
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

What lies beneath: Volcanic secrets revealed
Brisbane, Australia (SPX) Sep 15, 2021
Lava samples have revealed a new truth about the geological make-up of the Earth's crust and could have implications for volcanic eruption early warning systems, a University of Queensland-led study has found. UQ volcanologist Dr Teresa Ubide said it was previously understood that cooled lava from so-called 'hot spot' volcanoes was 'pristine' magma from the melting mantle, tens of kilometres under the Earth's surface. "This isn't quite the case - we've been misled, geologically deceived," Dr ... read more