Earthquake Swarms

[pottyprof]

With the subject of earthquake swarms being of interest following the onset at on El Hierro, the smallest of the Canary Islands, I thought it might be a good idea to start a separate thread on this subject for discussion and reports. This should keep the "earthquake discussion" and "volcanic discussion" clear of continuous reports that a swarm brings.

While it is a place to report details of a swarm, it is not a place to flood with every minor shake. These things tend to come in groups, so could we please keep discussion to "groups" of swarms or perhaps details of a 4 hour period?

Discuss.........

[Crepuscular Ray]

The swarm south of the island and El Hierro continues - I'm beginning to wonder whether it's the advent of a new eruption site to the south of the island. I was under the impression that the Canaries were over a hotspot and moving north like the rest of Africa, so is it possible that the islands have moved far enough to the north since any major eruption for the hotspot now to be that far south?

[bobbydog]

earthquake swarm at katla this morning, no eruption yet but surely it must have weakened the rock above the magma chamber

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/myrdalsjokull/

Edited October 5, 2011 by bobbydog

[Polarlow]

Earthquake swarm slap bang in the middle of the Med, and spreading towards the UK !

http://quakes.globalincidentmap.com/

Interesting.... never seen this many earthquakes close to the UK .......

[john pike]

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/atlantic/

not sure where to post this but iceland is quite active at present

http://www.emsc-csem.org/Earthquake/?filter=yes

[yamkin]

Iceland Earthquakes During The Last 48 Hours

Earthquake count:

• Magnitude less than 1: 57
• Magnitude 1 to 2: 50
• Magnitude 2 to 3: 20
• Magnitude more than 3: 6
• Total: 133

Edited October 18, 2011 by yamkin

[Argyllcraig]

Swarms in the med are perfectly normal and should show more regularly due to the increase in the SIL network covering the area having been increased over the last 12 months.

[Weather-history]

There was an earthquake swarm in the Greater Manchester area back in about 2002. Didn't feel a single one!

Edited October 19, 2011 by Mr_Data

[yamkin]

Earthquake Swarm at Mauna Kea in Hawai’i

[yamkin]

October 23, 2011 – CANARY ISLANDS – A large swarm of more than 52 tremors have been reported taking place today in the ocean on the north side of El Hierro. The tremors are happening off the coast of NW Frontera and are an indication that magmatic pressures have moved across the island.

Edited October 23, 2011 by yamkin

[toggerob]

Up to 104 aftershocks (and counting) around the Eastern Lake Van region since the magnitude 7.3 earthquake hit. Many of the aftershocks alone would have been substantial enough to have created their own headlines, even past 9pm UT there was yet another M6.0 nearby the city.

[yamkin]

Massive earthquake swarm near Gujarat- Is India on the eve of tearing?

An earthquake swarm of more than 41 earthquakes have shaken the region of Gujarat, India on October 21, 2011 following the 5.0 magnitude earthquake which struck the area the day prior at a depth of 15.5 km (9.6 miles). Since that time, the tremors in the region has increased at a frenzied pace- indicating the earthquake may be more than just a random seismic tremor.........http://www.isr.gujar.../Latest_EQ.html

Edited October 24, 2011 by yamkin

[john pike]

Thursday

27.10.2011 18:19:19 63.652 -19.090 3.7 km 2.7 69.47 8.0 km E of Goðabunga

Thursday

27.10.2011 17:53:35 63.639 -19.100 1.1 km 1.8 90.01 6.6 km N of Hábunga

Thursday

27.10.2011 17:52:25 63.691 -19.258 1.1 km 3.2 90.01 5.7 km N of Goðabunga

Thursday

27.10.2011 17:52:24 63.643 -19.087 1.1 km 3.2 90.06 7.0 km N of Hábunga

Thursday

27.10.2011 17:52:22 63.787 -19.138 7.8 km 2.9 31.91 9.2 km SSE of Ãlftavatn

Thursday

27.10.2011 17:52:20 63.655 -19.094 1.4 km 2.7 90.01 7.9 km ENE of Goðabunga

Thursday

27.10.2011 17:51:33 63.642 -19.078 1.1 km 1.4 90.04 7.0 km N of Hábunga

Thursday

27.10.2011 17:24:13 66.242 -16.581 6.5 km 2.1 32.46 8.8 km SW of Kópasker

fairly large activity in iceland near katla

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/#view=map

New earthquake swarm in Katla volcano

http://www.jonfr.com/volcano/

[yamkin]

Krakatoa Volcano Seismicity As Much As 4557 Times

Recorder of Mount Anak Krakatau (GAK) in the VillagePasauran, District Cinangka, Serang, Banten province, Indonesiarecorded seismicity of the volcano on Sunday as much as 4557times.............http://www.allvoices...h-as-4557-times

[yamkin]

Oklahoma is enduring continued Earthquake swarms

November 6, 2011 – OKLAHOMA CITY, OK - A stronger 5.6 magnitude earthquake has struck the state of Oklahoma about 63 km (39 miles) SSE of Stillwater. This is the most powerful earthquake to ever strike the state of Oklahoma. The epicenter of the earthquake was 34 km from Shawnee, 71 km (44 miles) from Oklahoma City and about 311 km (194 miles) from Dallas, Texas. Before today, the strongest earthquake Oklahoma had seen was a 5.5 magnitude quake which struck the state on April 9, 1952 near Reno, Oklahoma. Earlier today, the state was struck by a 4.7 earthquake. Today’s 5.6 earthquake was another very shallow event- registering at a depth of 5 km or 3.1 miles. Panicked residents reported houses and buildings were shaken by the latest tremor but we have not received any initial reports of damage. Courtesy of Extinction Protocol

Edited November 6, 2011 by yamkin

[Snowyowl9]

Yes biggest ever in oklahoma.

http://www.guardian.co.uk/world/2011/nov/06/earthquakes-oklahoma-biggest-ever?CMP=twt_fd

Damage also done.

[john pike]

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/265_35_eqs.php

list of quakes for Oklahoma from 5th to today

from usgs

[yamkin]

M 4.6 - CANARY ISLANDS, SPAIN REGION - 2011-11-11 00:20 UTC

http://www.emsc-csem...e.php?id=243979

During 10th November 2011, there were 36 Earthquakes. Magnitude 1.5 – 3.5 Depth 18 – 23 km

Edited November 11, 2011 by yamkin

[yamkin]

Santorini Volcano (Greece): Number Of Earthquakes Continues At Slightly Elevated Levels

Seismic activity beneath Santorini volcano continues to be slightly above normal levels. Beginning since July this year, there is elevated activity in a SW-NE trending zone passing through Nea Kameni and the submarine Kolumbos volcano NE of Santorini...............http://www.volcanodi...ted-levels.html

Edited November 13, 2011 by yamkin

[yamkin]

700 Earthquake swarm hits El Salvador, damaging homes

SAN SALVADOR, (Reuters): More than 700 slight to moderate earthquakes hit an area in eastern El Salvador in a 24-hour period, damaging dozens of homes but hurting no one. The brief quakes, which started Thursday and ranged from 1.8 to 4.6 in magnitude, have occurred in the municipality of El Carmen, some 163 km (101 miles) east of the capital of San Salvador, the country's National Territory agency said........http://thestar.com.my/news/story.asp?file=/2011/11/26/reutersworld/20111126121101&sec=reutersworld

[Lauren]

I don't know if this counts as a swarm but look at the activity around the Virgin islands on the 20th!

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/quakes_all.html

[yamkin]

Iceland Has Endured 366 Earthquakes During The Last 48 Hours

Time and magnitude of earthquake 17 Dec 18:30 GMT

[yamkin]

EARTHQUAKE SWARMS RATTLES PUERTO RICO

17.12.11

MONA PASSAGE, PUERTO RICO Magnitude 2.5 Depth 12 km

MONA PASSAGE, PUERTO RICO Magnitude 2.5 Depth 15.9 km

MONA PASSAGE, PUERTO RICO Magnitude 2.5 Depth 16.3 km

MONA PASSAGE, PUERTO RICO Magnitude 2.5 Depth 17.2 km

MONA PASSAGE, PUERTO RICO Magnitude 2.6 Depth 13 km

MONA PASSAGE, PUERTO RICO Magnitude 2.6 Depth 15.6 km

MONA PASSAGE, PUERTO RICO Magnitude 2.6 Depth 17.2 km

MONA PASSAGE, PUERTO RICO Magnitude 2.7 Depth 15.1 km

MONA PASSAGE, PUERTO RICO Magnitude 2.8 Depth 11.8 km

MONA PASSAGE, PUERTO RICO Magnitude 2.8 Depth 13.8 km

MONA PASSAGE, PUERTO RICO Magnitude 3.0 Depth 7.2 km

MONA PASSAGE, PUERTO RICO Magnitude 3.0 Depth 12.4 km

MONA PASSAGE, PUERTO RICO Magnitude 3.1 Depth 16 km

MONA PASSAGE, PUERTO RICO Magnitude 3.1 Depth 16.2 km

MONA PASSAGE, PUERTO RICO Magnitude 3.1 Depth 16.8 km

MONA PASSAGE, PUERTO RICO Magnitude 3.1 Depth 17.8 km

MONA PASSAGE, PUERTO RICO Magnitude 3.1 Depth 21.5 km

MONA PASSAGE, PUERTO RICO Magnitude 3.2 Depth 7.6 km

MONA PASSAGE, PUERTO RICO Magnitude 3.2 Depth 17 km

MONA PASSAGE, PUERTO RICO Magnitude 3.2 Depth 17.7 km

PUERTO RICO Magnitude 3.2 Depth 41 km

MONA PASSAGE, PUERTO RICO Magnitude 5.1 Depth 14 km

MONA PASSAGE, PUERTO RICO Magnitude 5.3 Depth 17 km

http://soundwaves.usgs.gov/2007/05/

Edited December 18, 2011 by yamkin

[yamkin]

El Hierro Volcano Stirs Itself Into Action Once More

A seven minute tremor signalled the possible resumption of notable quakes from the underwater volcano off La Restinga, but IGN scientists are not aware of new magmatic material appearing on the surface. This is a marked change in tempo from the quiet over the past few days. The stain in the sea clearly shows a dark brown head, bubbling in the middle surrounded by a green stain which denotes a presence of gases. GPS monitoring stations recorded the same pattern of stability in both vertical and horizontal components over over the past few days..............http://www.tenerifenews.com/index.php/news-mainmenu-1/canary-islands/el-hierro/17785--hierro-volcano-stirs-itself-into-action-once-more

[Crepuscular Ray]

Since then, Earthquake Report seems to think that things are quietening down.