SEEKING the world תור את העולם: רעידת אדמה

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31 אוגוסט, 2012

Earthquake in Southwest Iceland

30.08.2012 | 12:30

מתוך אתר

http://www.icelandreview.com

Earthquake in Southwest Iceland, No Damage Reported

An earthquake measuring 4.6 hit near Bláfjöll, Southwest Iceland, around midday today. There have been no reports of damage.

earthquakemap

The red star indicates the location of the earthquake.
From the website of the Meteorological Office of Iceland.
Bláfjöll is located a half hour drive from the capital and is a popular destination for skiing during the winter (being autumn, the ski resorts are currently closed). The earthquake could be felt in the capital area.

According to Einar Kjartansson from the Meteorological Office of Iceland, the epicenter lay at a depth of 5.8 kilometers. Einar says that aftershocks can be expected, ruv.is reports.

Seismic activity in the nearby Reykjanes peninsula is common but no unusual activity had been detected prior to the latest earthquake.

הכותב יוסי לוי joseph levy הינו מומחה לאיסלנד iceland, המלווה קבוצות בנהיגה עצמית בלבד, והמתכנן מסלולי טיול לפי מידת המטייל,והמשמש כמומחה באתר http://www.gotravel.co.il/.

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24 אוגוסט, 2012

Quakes in South Iceland’s Katla Volcano

21.08.2012 | 11:00

מתוך אתר

http://www.icelandreview.com

More Quakes in South Iceland’s Katla Volcano

An earthquake at the magnitude of 3.1 points hit north of Hábunga in Mýrdalsjökull glacier, which covers the volcano Katla in South Iceland, around 7 am this morning. The epicenter lay at a depth of 1.1 kilometers.

Mýrdalsjökull. Photo by Páll Stefánsson.

On Friday, an earthquake at a magnitude of 3.8 points hit in the same location, visir.is reports.
The information was recorded by the Icelandic Meteorological Office’s automatic sensors. They showed that the earthquake this morning was followed by a swarm of minor quakes, all of which had a magnitude of 2.0 or less.
Katla has been subject to series of seismic activity lately.

Click here to read more about Katla and here to read about recent seismic activity in Krýsuvík, Southwest Iceland.

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Earthquake Swarm in Southwest Iceland

20.08.2012 | 11:32

מתוך אתר

http://www.icelandreview.com

Earthquake Swarm in Southwest Iceland

A series of minor earthquakes was picked up by sensor by the geothermal area Krýsuvík on Reykjanes peninsula in Southwest Iceland on Saturday. The strongest of the earthquakes had a magnitude of 2.1 but most of them were below one.

Krýsuvík. Photo by ESA.

The series started shortly before 4 pm and lasted for three hours. The epicenter of the earthquakes was below the southern end of Kleifarvatn Lake, ruv.is reports.
Geophysicist Kristín Waagfjörð at the Icelandic Meteorological Office said earthquake swarms like these are very common in the Krýsuvík area.
In 2010 and 2011 there was constant uplift at Krýsuvík of a total of eight centimeters. At the end of last year, the land started sinking again.
Earth scientists are monitoring the uplift closely. It might either be related to pressure from geothermal heat or magma which could lead to volcanic activity.
Volcanologist Haraldur Sigurðsson writes about the conditions at Krýsuvík in the latest issue of the print edition of Iceland Review, and the risk of lava flows reaching the capital.

click here to read more about seismic and volcanic activity in Iceland.

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27 יולי, 2012

Minor Earthquake Hits Iceland’s Katla Volcano

27.07.2012

מתוך אתר http://www.icelandreview.com

Minor Earthquake Hits Iceland’s Katla Volcano

רעידת אדמה קלה היכתה בהר געש Katla באיסלנד

An earthquake of the magnitude 2.7, which epicenter was underneath the Mýrdalsjökull icecap in south Iceland where the volcano Katla lies, was picked up by the Icelandic Meteorological Office’s sensors on Wednesday evening.

רעידת אדמה בעצמה 2.7, שמוקד הרעש היה מתחת לכיפת השלג בקרחון Mýrdalsjökull בדרום איסלנד שבו נמצא הר הגעש Katla נאספה על ידי החיישנים המטאורולוגי האיסלנדי של המשרד ביום רביעי בערב.

Mýrdalsjökull. Photo by Páll Stefánsson.

A total of 75 minor earthquakes hit the Mýrdalsjökull area, 55 of which originated in the caldera itself, Morgunblaðið reports.

Overall, the Icelandic Meteorological Office’s sensors registered 240 minor earthquakes in the country in the past week.

In a period of 20 minutes on Monday evening, ten earthquakes hit north of Tjörnes in Northeast Iceland, close to the island Grímsey, the strongest of which had a magnitude of 3.5 (3.7 in earlier reports).

סך של 75 רעידות אדמה קלות פגע באזור של Mýrdalsjökull, חמישים וחמש שמקורם בהר הגעש עצמו, דיווחי Morgunblaðið.
בסך הכל, החיישנים המטאורולוגי האיסלנדי של המשרד רשמו 240 רעידות אדמה קלות בארץ בשבוע האחרון.
בתקופה של 20 דקות ביום שני בערב, 10 רעידות אדמה פגעו מצפון לTjörnes בצפון מזרח איסלנד, הקרוב לאי Grímsey, החזק ביותר שהייתה בעצמה של 3.5 (3.7 בדו"חות קודמים).

Click here to read more about the earthquake swarm and here to read more about Katla.

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Earthquake in Northeast Iceland

24.07.2012 | 11:36

מתוך אתר http://www.icelandreview.com

Earthquake Swarm in Northeast Iceland

A series of minor earthquakes, the largest with a magnitude of 3.7, hit 27-33 kilometers east-southeast of Grímsey, Iceland’s northernmost inhabited island, shortly after 7:45 pm yesterday. Most of the other quakes were around a magnitude of two.

Grímsey. Photo by Páll Stefánsson.

Einar Kjartansson, geophysicist at the Icelandic Meteorological Office, told Morgunblaðið that earthquakes of this magnitude hit the region around Grímsey at one to two month intervals.

The earthquake swarm was not out of the ordinary and even though islanders may have felt the strongest earthquake, they were hardly alarmed, Einar said—people are used to the ground trembling in Grímsey.

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21 יולי, 2012

Katla Volcano Shaking

18.07.2012 | 00:00

מתוך אתר http://www.icelandreview.com/

Katla Volcano Shaking, Geologist Says

During the volcanic eruption in Eyjafjallajökull in 2010, an eruption that closed the airspace of Europe, many talked about the bigger and more active volcano, Katla, which is thought to be due to erupt at any moment. However, it has been due to erupt for almost fifty years. The latest Katla eruption in 1918 caused considerable damage and the volcano is feared wide and far.

Katla erupts in 1918

The famous Icelandic volcanologist Haraldur Sigurdsson notes in his blog on July 17 that small earthquakes in Katla volcano have been frequent in both 2012 and 2011. In the accompanying graph you can see the number of earthquakes each year from 1991 to 2012. The situation is clearly not normal since the peak is in 2012.

Katla quakes 1991-2012

Source: Haraldur Sigurdsson.

Haraldur asks whether these are ice-quakes formed by movement and melting of the glacier, or quakes in the crust of the earth, connected to the volcano itself. He draws the conclusion from observing quakes in Godabunga, west of Katla, that it is unlikely that the quakes are related to melting of ice due to the glacier. Hence, he says that possibly the quakes are related to geothermal heat under the ice. Haraldur Sigurdsson concludes by saying that Katla continues to cause nervousness among all.

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13 יולי, 2012

Earthquake in South Iceland

08.07.2012 | 14:56

מתוך אתר http://www.icelandreview.com/

Earthquake in South Iceland

An earthquake of the magnitude 3,1 occurred at Ingólfsfjall near Hveragerði in south Iceland at 12:20 today, according to the Icelandic Meteorological Office. Several aftershocks have followed.

From Hveragerði. Photo by Geir Ólafsson.

Seismic activity has been detected in the area over the last three weeks. The number of earthquakes has increased but most of them have been very small, or a maximum of 1,0 in magnitude, mbl.is reports.

The earthquake was felt in the towns of Hveragerði and Selfoss, as well as surrounding areas. No damage has been reported.

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25 יוני, 2012

Earthquake Hits Island in North Of Iceland

23.06.2012 | 00:00

מתוך אתר http://www.icelandreview.com/

Earthquake Hits Island North Of Iceland

An earthquake of the magnitude 3.2 points was picked up by sensors southeast of Kolbeinsey, a small uninhabited island north of Iceland that marks the country’s territorial waters, at 11:11 am on Thursday.

View from Tjörnes. However, the island on the picture is Lundey. Photo by Páll Stefánsson.

According to the Icelandic Metrological Office, some aftershocks followed, but they were all significantly smaller, Morgunblaðið reports.

Seismic activity is very common in this area as it lies on the borders of the Eurasian and North American continental plates north of Tjörnes peninsula. No one reported to have noticed the earthquake on the Icelandic mainland.

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15 יוני, 2012

Grímsvötn Volcanic Eruption Causes Glacial Melt

12.06.2012 | 06:00

מתוך אתר http://www.icelandreview.com

Grímsvötn Volcanic Eruption Causes Glacial Melt

Geophysics professor Magnús Tumi Guðmundsson said there are still consequences from the May 2011 eruption in Grímsvötn, a sub-glacial volcano in Vatnajökull in southeast Iceland, including more rapid melting of the icecap.

Grímsvötn. Archive photo by Páll Stefánsson.

There is a 45°C (113°F) hot lagoon on the glacier’s surface, an uplifting by three centimeters has occurred as the icecap decreases and the water surface of glacial rivers continues to rise, Morgunblaðið reports.

“We assume that significant melt will occur in the western Vatnajökull this summer,” predicted Magnús Tumi, who recently returned from a research expedition to Grímsvötn on behalf of the Glacial Research Association.

During the expedition, researchers sailed on the lagoon in Grímsvötn. “It is remarkable because it’s very hot. In the crater there was a little stream with 45°C warm water. A few hundred meters wide part of the lagoon was at bathing temperature, 25-40°C.”

“The eastern part of the lagoon is considerably colder, yet lukewarm, which is noteworthy given that it is surrounded by a wall of ice,” Magnús Tumi continued. The high temperature is a leftover from the eruption last year.

And the ash fall continues. During dry and windy conditions, ash will blow across south Iceland this summer and even longer.

Large drifts of ash have accumulated by the Ring Road in south Iceland. Drivers are asked to be careful because the ash might blows across the road and block visibility, Fréttablaðið reports.

Click here to read more about the expedition to Grímsvötn

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Quakes Hit Katla Volcano in South Iceland

11.06.2012 | 11:57

מתוך אתר http://www.icelandreview.com/

Series of Quakes Hit Katla Volcano in South Iceland

A series of earthquakes began in the sub-glacial volcano Katla in Mýrdalsjökull, south Iceland, shortly before 5 am this morning. Between 5 and 6 am 14 minor quakes were registered there, the strongest of which had the magnitude 1.6 points.

Mýrdalsjökull. Photo by Geir Ólafsson.

Between 6 and 8 am, six other minor quakes were picked up by the Icelandic Meteorological Office’s sensors, but after that the series subsided, visir.is reports.

Geographer Sigþrúður Ármannsdóttir at the Icelandic Meteorological Office, said the epicenter of the quakes were in the ice cauldrons that opened up during what probably was a minor eruption in Katla last summer, when the river Múlakvísl flooded, tearing a hole in the Ring Road.

Sigþrúður believes they were caused by geothermal activity. She added that increased conductivity that has been measured in Múlakvísl lately might indicate that geothermal water is leaking into it.

Approximately one month ago a small glacier outburst occurred in Katla which lasted a few days. Seismic activity in the volcano was picked up by sensors, as well as increased conductivity in Múlakvísl.

The reason was also believed to be increased geothermal activity in one of Katla’s craters.

Click here to read more about activity in Katla.

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10 יוני, 2012

More Grímsvötn Eruptions Expected in Near Future

08.06.2012 | 06:00

מתוך אתר http://www.icelandreview.com/

More Grímsvötn Eruptions Expected in Near Future

Eruptions in the sub-glacial volcano Grímsvötn in Vatnajökull, which last burst in 2011, can be expected every five to ten years in the coming decades, according to geophysicist Magnús Tumi Guðmundsson. A group of scientists is currently studying the volcano.

The first day of the 2011 Grímsvötn eruption. Photo by Patrick J. Dorflein.

The geothermal area in Grímsvötn is clearly visible to the group, which comprises representatives of the University of Iceland Science Institute, Landsvirkjun – the National Power Company and the Glacial Research Association.

They traveled to Vatnajökull a few days ago to put up GPS monitors, take samples from the glacier and read meters, ruv.is reports.

The crater that formed at Grímsvötn during the eruption last year measures 1.5 kilometers in diameter. It used to be covered in water but most of it has now evaporated. The water is hot and steam emanates from it.

Grímsvötn eruptions come in series, each of which lasts 60 to 80 years, Magnús Tumi explained. The last series began in 1996 with eruptions following in 1998, 2004 and 2011, which was the largest by far, causing extensive ash fall.

“One can expect the development to continue in the next few decades that regular eruptions will occur in Grímsvötn with approximately five to ten year intervals,” he said.

“However, Grímsvötn lie far away from human settlements and if they are on a small scale they don’t have much of an impact,” Magnús Tumi concluded.

Click here to watch RÚV’s footage from the Grímsvötn geothermal area and here to read other recent volcano news.

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01 יוני, 2012

Volcanic Activity near Reykjavík?

28.05.2012 | 12:33

מתוך אתר
http://www.whatson.is/icelandreview/search/news/Default.asp?ew_0_a_id=390364

Volcanic Activity near Reykjavík?

Volcanologist Haraldur Sigurdsson, one of the world’s most respected scientist in his field, said that land rise in Krýsuvík, about 20 kilometers from Reykjavík, Iceland’s capital, could mean that volcanic magma is streaming into the earth’s crust.

Land in the Krýsuvík area has risen about eight centimeters in two years and the area is watched closely because it could be an active volcano. The last eruption in the area was about 800 years ago and the lave in Hafnarfjördur, a town south of Reykjavík, came from that area.

Sigurdsson says that even though there may be magma movement it is by no means certain that it will come to the surface as it did in 1151, forming the laves Ögmundarhraun, north of Grindavík on the south coast and Kapelluhraun by Hafnarfjördur. Alcan’s aluminum smelter is situated in Kapellluhraun.

The volcanic area goes from Grindavík in the south to Heidmörk on the outskirts of Reykjavík in the north.

Sigurdsson told RÚV that a possible eruption would be along that rift and lava would flow from it. “But nothing indicates that an eruption is imminent. But geological history and the information that we have on that area indicate that this is possible and therefore both Iceland Met and the University of Iceland follow this area closely.”

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25 מאי, 2012

Minor Glacial Burst in South Iceland Volcano Katla

20.05.2012 | 13:00

מתוך אתר
http://www.whatson.is/icelandreview/search/news/Default.asp?ew_0_a_id=390134

Minor Glacial Burst in South Iceland Volcano Katla

A small glacial burst occurred in the volcano Katla, which lies underneath the Mýrdalsjökull icecap in south Iceland, on April 28 and lasted a few days. The activity was registered by seismic monitors and increased conductivity was measured in the river Múlakvísl until May 7.

Last summer a large glacial burst, probably caused by a minor eruption in Katla, caused the river to swell and tear a hole in the Ring Road, right at the height of the tourism season in early July.

Oddur Sigurðsson, a geologist at the Icelandic Meteorological Office, told visir.is that the glacial burst in late April was so insignificant that it couldn’t be detected by the naked eye.

Oddur explained that it was caused by geothermal activity in one of Katla’s craters.

Volcano enthusiast and blogger Jón Frímann Jónsson reported on two events in Katla, on April 28 and May 6 or 7, and considers them to be warning signals: something is happening in the volcano, he predicts.

He also commented on the recent series of earthquakes which hit Herðubreið in the northeastern highlands early this week.

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18 מאי, 2012

Earthquakes Hit Northeast Iceland

15.05.2012 | 14:00

מתוך אתר http://www.icelandreview.com/

Series of Earthquakes Hit Northeast Iceland

A series of earthquakes began near Mt. Herðubreið in the northeastern highlands at noon yesterday and was still ongoing this morning. The largest quake measured 3.2 points on the Richter scale but most aftershocks, approximately 100, were below two points.

Herðubreið. Photo by Geir Ólafsson.

The most seismic activity was noted between 8 and 11 pm last night. A few quakes hit this morning but now the series seems to be subsiding, ruv.is reports.

It is common for series of minor earthquakes to hit the region near Herðubreið and there are no indications of upcoming volcanic eruptions or other activity in the area.

There were some concerns of volcanic activity by the nearby volcano Askja earlier this winter but scientific research concluded that there were no indications of an imminent eruption.

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13 אפריל, 2012

Icelandic Volcanoes Said to Be Growing Restless

11.04.2012 | 14:00

מתוך אתר

http://www.whatson.is/icelandreview/search/news/Default.asp?ew_0_a_id=388985

Icelandic Volcanoes Said to Be Growing Restless

Two years ago, the eruption of the volcano Eyjafjallajökull caused havoc across Europe, with airborne ash grounding flights for six days.

Eyjafjallajökull may be quiet now, but, according to The Telegraph, activity has been increasing in the volcano belt that stretches diagonally across the middle of Iceland from the Westman Islands in the south to the Lake Mývatn area in the north, along the line of the American and Eurasian geological tectonic plates.

This region includes the volcano Katla, which has erupted about every 60 years (the last time in 1918), the volcano Hekla, which has erupted approximately once every ten years in the past decade (the last time in 2000), and Grímsvötn, which had a short eruption last year.

In the 17th and 19th centuries, eruptions of Eyjafjallajökull were followed within months by eruptions of Katla, and now too, Katla has been increasingly restless.

Increased activity has also been detected in the volcanoes under the largest ice cap, Vatnajökull, which is where Grímsvötn lies.

In July 2011, geothermal heat caused melting in Mýrdalsjökull, the ice cap covering Katla, producing a flood that destroyed an important bridge on the south coast of Iceland at the height of the tourist travel season.

According to precise GPS measurements, there has been movement of the surface of the volcano, as well as bursts of high earthquake activity beneath Katla’s caldera, indicating that magma has risen closer to the surface.

Scientists have been monitoring the volcano closely ever since the glacial burst last July and every now and then earthquakes have caused concern that an eruption might be coming up. Yet while repeatedly making headlines last autumn, Katla has been rather quiet in recent months.

The scale of the damage from an eruption in Katla would depend on the direction of the wind, as well as on the style, size and duration of the eruption.

A major eruption of Katla could cause flooding, poisoning of agricultural land, destruction of property, interference with air traffic across Europe, and even global cooling for several years.

This is because Katla is likely to produce very fine ash, as did Eyjafjallajökull, which would remain airborne for days.

However, scientists stated in January that due to increased knowledge, better surveillance and more accurate forecast models—and the experience drawn from the eruptions in Eyjafjallajökull and Grímsvötn—future eruptions will cause fewer disturbances to air traffic than in 2010.

The University of Iceland is working with Delft University of Technology and other institutions to develop more accurate systems to track and predict volcanic activity, in order to deal with the threat and damage of eruption.

Last week the story broke that Askja volcano in the northeastern highland might be preparing to erupt as its crater lake, Öskjuvatn, was iceless despite frosty temperatures.

Travelers have been warned about visiting the area and scientists have launched a research expedition to determine the likelihood of an eruption.

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