More than 13 000 earthquakes at Tjörnes Fracture Zone since June 19, Iceland
Earthquake swarm at the Tjörnes Fracture Zone continues, with more than 13 000 quakes detected since the swarm started on June 19, 2020. This is the largest earthquake swarm in the region recorded in the past 40 years.
According to the Icelandic Met Office (IMO) report on July 15, more than 13 000 earthquakes were detected since the swarm started, with three over M5. The largest was M5.8 on June 21, 34 km (21 miles) NNE of Siglufjörður. The two others were M5.4 and M5.6 on June 20, both located around 20 km (12.4 miles) NE of Siglufjörður.
"Seismic activity is still ongoing and there are chances of more earthquakes of this magnitude occurring in the area," IMO said.
Two weeks ago, Kristín Jónsdóttir, IMO's Earthquakes Hazards Officer, said this is the largest earthquake swarm in the Tjörnes Fracture Zone recorded in the past 40 years. At the time, the number of registered quakes was about 9 000.
"It is very difficult to say when the swarm will end," she said at the time. "The behavior is episodic, we record hundreds of earthquakes in a few hours and then it becomes quiet and all of a sudden it starts again. The last swarm in 2012 was ongoing for a few weeks. Let's hope we only have a few weeks to go."
IMO is still investigating the cause of earthquakes.
They are shallow so it could be that they are related to geothermal production in the region, as they are located near a geothermal power plant, Jónsdóttir said.
The offshore Tjörnes Fracture Zone is an oblique transform zone that separates the northern volcanic zone of Iceland from the Kolbeinsey Ridge, part of the Mid-Atlantic Ridge north of Iceland.
A submarine eruption was reported during 1867-1868 at the SE part of the fissure system off the northern coast of Iceland along the Manareyjar Ridge immediately north of Manareyjar Island. (GVP)
Featured image: Google, EMSC, TW
If you value what we do here, create your ad-free account and support our journalism.
Your support makes a difference
Dear valued reader,
We hope that our website has been a valuable resource for you.
The reality is that it takes a lot of time, effort, and resources to maintain and grow this website. We rely on the support of readers like you to keep providing high-quality content.
If you have found our website to be helpful, please consider making a contribution to help us continue to bring you the information you need. Your support means the world to us and helps us to keep doing what we love.
Support us by choosing your support level – Silver, Gold or Platinum. Other support options include Patreon pledges and sending us a one-off payment using PayPal.
Thank you for your consideration. Your support is greatly appreciated.
Commenting rules and guidelines
We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules:
We reserve the right to remove any comments that violate these rules. By commenting on our website, you agree to abide by these guidelines. Thank you for helping to create a positive and welcoming environment for all.