Volcanoes
The full report is here.
The quake's epicentre was recorded about 25 miles away from Reykjavik, in the Reykjanes Peninsula region, on Iceland's southeast coast.
The effects of the quake, which struck at a depth of around six miles, were felt in Reykjavik and the surrounding areas.
It was not immediately clear if there had been any damage to property or injury to life.
"Spent the morning shaking around the office, geologists all running around like excited puppies. So much shaking," Rob Askew, a geologist at the Icelandic Institute of Natural Science in Reykjavík, tweeted.
Another Twitter user wrote: "WOW....! Just now! #earthquake swarm on Reykjanes Peninsula #Iceland - very strongly felt in Reykjavík. My home office was shaking! Felt 2 large ones and many small ones."
Another said: "I've experienced more earthquakes in the past couple of hours than the rest of my life combined. And I've spent most of my life in Iceland and Japan. Something's up. I don't like it."

Large streams of red hot lava flow as Mount Etna, Europe's most active volcano, leaps into action, as seen from the village of Fornazzo
Mount Etna's latest eruption overnight petered out on Tuesday morning, according to Italy's National Institute for Geophysics and Volcanology.
Rivers of lava were seen gushing from the volcano's southeast crater, with clouds of debris rising several kilometres above its summit.
The red and orange glow of the magma resulted in mesmerising photographs. Nearby Catania Airport was forced to close temporarily due to the amount of ash being spewed forth from Mount Etna.
Residents in the town of Pedara said during one day last week, it appeared as though it were raining rocks as a thick blanket of ash covered the town.
Comment: The intense activity of Sicily's Mount Etna continues. A few days ago it erupted for the fourth time in four days.
Here is a timeline compiled by Anadolu Agency.
Jan. 2:
- Massive forest fire engulfs the picturesque Dzuko Valley located in northeastern India.
Jan. 3:
- The death toll from the landslide in the village of Ask, Norway, on Dec. 30, rises to six.
- Mount Sinabung in North Sumatra, Indonesia, erupts, spewing ash columns up to 1,000 meters high.
Comment: See also:
- Sicily's Mount Etna erupts for fourth time in four days
- Ice Age Farmer Report: Amazon bans international seed sales: Problem, Reaction, Famine: Technocrats take control of seeds
- India: The WEF agenda behind Modi's destructive farm reform
- Economists forecast trouble: Rising food prices globally mean it's more and more expensive to eat
The powerful eruption of the highest active volcano in Europe sent torrents of lava pouring from its southeast crater, according to the National Institute of Geophysics and Volcanology.
Clouds of debris rose several kilometers above the summit.
Etna is a popular tourist destination in Italy attracting hikers eager to see the extraordinary lava flows glowing orange at night.
The volcano, close to Indonesia's cultural capital Yogyakarta on Java island, had already spewed lava almost two dozen times over the two last days and caused hundreds of minor volcanic quakes, according to a report by Indonesia's geological agency.
"This morning, lava avalanches were observed seven times," the agency said, with the lava travelling up to 700 metres to the southwest.
A huge rumble and a belch of steam and rocks erupts from the crater of the volcano that towers above us.
It's truly terrifying feeling such power, so near.
I looked about me, wondering where I would I hide if the volcano's eruptions suddenly intensified. And then I realised - and it's obvious really - there is nowhere to run and hide.
Up here, perched high on the side of Guatemala's Pacaya volcano, at the closest monitoring point to the peak of the volcano, one feels very insignificant.
To my right, away from the belching crater, a vast lava field plummets towards the valley floor and, in the distance, the towns and villages directly in its path.
Comment: Guatemala: There's nowhere to hide - hundreds of thousands live in the shadow of 3 erupting volcanoes