First volcano-tectonic tremors rattle Sao Jorge, Azores – Quakes indicate movement of magma

earthquake swarm volcano Azores Islands
earthquake swarm volcano Azores Islands.

Volcano-tectonic tremors, which indicate the movement of magma, were recorded on the earthquake-hit mid-Atlantic Azores island of Sao Jorge for the first time since a worrying seismic crisis began more than two weeks ago, authorities said on Wednesday.

The lush green volcanic island, in Portugal’s Azores archipelago, has been hit by 27,626 small tremors and there are fears the activity could herald an eruption or a powerful earthquake.

Preparedness: Portable power station? Better look at Jackery!

Fatima Viveiros, from the region’s CIVISA seismo-volcanic surveillance centre, said volcano-tectonic earthquakes, also known as hybrid, happen when there is a “fusion” of high-frequency tectonic tremors with low-frequency volcanic ones.

“(It) suggests the movement of fluids at depth,” Viveiros explained, adding that more earthquakes of that kind were expected. “These signals show what is to be expected in active volcanic systems.”

The volcanic alert is at Level 4 on a five-step scale, meaning there is a “real possibility” the volcano could erupt for the first time since 1808.

Preparedness: Get the best lightning and EMP protection available

A 2015 study published on the Journal of Volcanology and Geothermal Research said volcano-tectonic earthquakes were “usually the earliest reported seismic precursor for eruptions at volcanoes that have been dormant for decades or more”.

CIVISA said an eruption was not was not imminent but said such a scenario could not be discounted.

So far, all the recorded earthquakes had been purely of tectonic origin rather than volcanic-tectonic as Wednesday’s tremors, reaching a magnitude of up to 3.8 and causing no damage.

Preparedness: Buy the best value freeze dried emergency food around

According to the United States Geological Survey, volcano-tectonic earthquakes can occur due to “normal tectonic forces, changing stresses caused by moving magma and movement of fluids through pre-existing cracks”.

Azores’ emergency plan was activated on March 23, four days after the seismic crisis began, an evacuation strategy has been prepared in case of need, and various resources have been deployed to the island. [Reuters] has been banned from AD NETWORKS! You can support me here

Things to add to your disaster & preparedness kit:

qfiles by steve quayle

1 Comment

Leave a reply

Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.