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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » EARTH CHANGES »  BREAKING - 7.3 EARTHQUAKE IN SAN JUAN, MEXICO - Swarms of quakes setting new records! |

BREAKING - 7.3 EARTHQUAKE IN SAN JUAN, MEXICO - Swarms of quakes setting new records! |

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Last edited by PurpleSkyz on Fri Feb 16, 2018 8:10 pm; edited 1 time in total









Intense earthquake swarm at Tjörnes Fracture Zone, Iceland

Posted by TW on February 16, 2018 


An intense earthquake swarm is taking place at Tjörnes Fracture Zone volcano near Grimsey island, Iceland over the past 7 days. More than 1 100 of earthquakes were detected in this region since Wednesday, February 14, 2018. The last known eruption of this submarine volcano was in 1868.
The largest earthquake so far was M4.1 at 19:37 UTC on February 15, about 10 km (6.2 miles) ENE of Grimsey. "It is the largest earthquake detected in the seismic swarm that began a week ago and is still ongoing," the Icelandic Met Office said late Thursday. EMSC registered this quake as M3.7 at a depth of 14 km (8.7 miles).
A magnitude 3.2 earthquake occurred at 19:28 UTC in the same area, followed by two events above M3, at 19:38 and 19:39 UTC.
There are no signs of volcanic unrest, IMO said. "This area is part of the Tjörnes Fracture Zone and earthquake swarms are common in the area."
More earthquakes, even bigger, cannot be ruled out, the agency added.
A total of 1 165 earthquakes were detected since 08:56 UTC on February 14. 11 of them had magnitudes above 3, 162 between 2 and 3, 951 between 1 and 2 and 41 less than 1.

Tjörnes fracture zone earthquakes February 14 - 16, 2018. Credit: IMO

Regional seismicity

Geological summary

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.
Featured image: Location of earthquakes at Tjörnes fracture zone - February 2018. Credit: EMSC

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Earthquake swarm under Cumbre Vieja volcano, Canary Islands

Posted by TW on February 16, 2018 


A new seismic swarm started under Cumbre Vieja volcano (La Palma), the Canary Islands on February 10, 2018. Quakes in this latest swarm are stronger than those in the previous swarm in October 2017, the first swarm in this area in 30 years.
National Geographic Institute (IGN) registered a total of 83 earthquakes between 23:23 UTC, February 10 and 07:32 UTC, February 15 with magnitudes ranging from 1.6 to 2.6.
In addition, there have been several hundred more which weren't detected due to their magnitude and depth.

Cumbre Vieja earthquake swarm February 10 - 15, 2018. Credit: IGN
The depth of the quakes decreased during the course of the swarm, suggesting an upward movement of magma towards the surface.
The Canary Government called for an urgent meeting of the Scientific Committee for Evaluation and Monitoring of Volcanic Phenomena to discuss why the quakes are happening again and what might happen in the future. This is the second such meeting in four months.
INVOLCAN said that this new series is something expected based on geochemical measurements made in the Cumbre Vieja volcano.

La Palma, Canary Islands. Credit: CEDIDA

Geological summary

The 47-km-long (29 miles) wedge-shaped island of La Palma, the NW-most of the Canary Islands, is composed of two large volcanic centers. The older northern one is cut by the massive steep-walled Caldera Taburiente, one of several massive collapse scarps produced by edifice failure to the SW.
The younger Cumbre Vieja, the southern volcano, is one of the most active in the Canaries. The elongated volcano dates back to about 125 000 years ago and is oriented N-S. Eruptions during the past 7 000 years have originated from the abundant cinder cones and craters along the axis of Cumbre Vieja, producing fissure-fed lava flows that descend steeply to the sea.
Historical eruptions at La Palma, recorded since the 15th century, have produced mild explosive activity and lava flows that damaged populated areas. The southern tip of the island is mantled by a broad lava field produced during the 1677-1678 eruption. Lava flows also reached the sea in 1585, 1646, 1712, 1949, and 1971. (GVP)
Featured image: Earthquake swarm under Cumbre Vieja volcano, La Palma, Canary Islands - February 2018. Credit: IGN

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