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Mahesh

12/11/23 14:02 PM IST

Iceland declares state of emergency after series of powerful earthquakes rock Reykjanes peninsula

In News
  • An Icelandic town near the capital Reykjavik and home to some 4,000 people was evacuated overnight after hundreds of tremors caused fears of a volcanic eruption.
About Iceland
  • Iceland is located on the Mid-Atlantic Ridge, technically the longest mountain range in the world, but on the floor of the Atlantic Ocean.
  • The ridge separates the Eurasian and North American tectonic plates — making it a hotbed of seismic activity.
  • On average, Iceland experiences around 26000 earthquakes a year according to Perlan, a Reykjavik-based natural history museum. Most of them are imperceptible and unconcerning.
How Earthquakes causes volcanic activity?
  • Deep under the Earth’s surface, intense heat melts rocks to form magma, a thick flowing substance lighter than solid rock.
  • This drives it upwards and most of it gets trapped in magma chambers deep underground. Over time, this viscous liquid cools and solidifies once again.
  • However, a tiny fraction erupts through vents and fissures on the surface, causing volcanic eruptions.
  • Now, the movement of magma close to Earth’s surface exerts force on the surrounding rock, which often causes earthquake swarms.
  • Now, the underground movement of magma does not necessarily lead to an eruption. But closer it gets to the surface, more likely an eruption is, and more frequent symptomatic earthquake swarms get.
Where eruption will take place?
  • Fagradalsfjall lies about 40 km to the southwest of Reykjavík and is the “world’s newest baby volcano.”
  • It had been dormant for eight centuries before erupting in 2021, 2022 and 2023.
  • Since the 2021 eruption, tourists from across the world have swarmed (sic) to Fagradalsfjall to catch a glimpse of molten lava flowing gushing onto Earth’s surface.
  • A considerable amount of magma is moving in an area extending from Sundhnjúkagígum in the north towards Grindavík.
  • Grindavík, a town of 4,000 on Iceland’s southern coast lies about 10 km from the site of the previous Fagradalsfjall eruptions. It has been evacuated as a precaution.
How many active does Iceland have?
  • Iceland is home to some of the most active volcanoes in the world, with volcanos being an integral part of the island’s landscape and culture.
  • Currently, it boasts of 33 active volcanoes which have erupted over 180 times in the past 1,000 years.
  • According to United States Geological Service, active volcanos are those which have “erupted within the Holocene (the current geologic epoch, which began at the end of the most recent ice age about 11,650 years ago),” or which have “the potential to erupt again in the future.”
  • One of Iceland’s most famous volcanoes is Eyjafjallajökull.
  • In 2010, this volcano erupted and caused a massive ash cloud to spread across Europe.
  • The ash cloud disrupted air travel for weeks and caused billions of dollars in damage. Other famous volcanoes include Hekla, Grímsvötn, Hóluhraun, and Litli-Hrútur (part of the Fagradalsfjall system).
Source- Indian Express

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