Geology, Earthquakes & Volcanism News and Discussions

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caltrek
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Iceland Girds for Feared Volcanic Eruption
Mie Olsen
November 14, 2023

Introduction:
COPENHAGEN, Denmark (Courthouse News) — Iceland has been holding its breath since a series of earthquakes hit its southwestern Reykjanes Peninsula last week, leading to fears of seismic activity around the volcanic mountain Thorbjörn.

Iceland’s Meteorological Office has categorized the volcano as showing "heightened unrest with increased likelihood of eruption." On Monday alone, over 900 earthquakes were detected in the active area between the towns of Sundhnúkur and Grindavík.

A 9-mile-long corridor with magma reaching up to 800 meters (2,625 feet) below ground appeared and has caused fear that the movement could lead to a series of dangerous eruptions, which generally happen when the molten or semi-molten rock reaches the surface and explodes as burning lava. However, in Iceland there is also a risk of underwater explosions.

Bill McGuire, a volcanologist and emeritus professor of geophysical and climate hazards at University College London, estimated on Monday that an eruption over the next days is still highly likely.

He said that on land, an eruption would most likely “be dominated by spectacular lava ‘fountaining’ and the production of lava flows,” while “if magma breaks the surface at the southern end of the fracture, it could erupt beneath the sea, which would be a more explosive event.”
Read more here: https://www.courthousenews.com/iceland ... ruption/
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Iceland volcano: Peninsula faces 'decades' of instability

8 hours ago

Iceland's south-western peninsula could face decades of volcanic instability, warns the Icelandic Met Office (IMO).

Earthquakes and fears of an impending eruption have led to the evacuation of the small fishing town of Grindavik.

After an 800-year hiatus, eruptions on the Reykjanes Peninsula began again in 2021, which may mark a new "eruptive cycle", the IMO's Matthew Roberts says.

"We expect to see volcanic eruptions along the peninsula, not just repeatedly in the same location."

This instability, he adds, could last decades.

https://www.bbc.co.uk/news/world-europe-67429872


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Cornwall shaken by 2.7 magnitude earthquake
1 hour ago

An earthquake has shaken parts of Cornwall, with people saying it felt like an explosion or avalanche.

Seismologists at the British Geological Survey recorded the 2.7 magnitude quake at 00:50 GMT.

Its epicentre was in the Mounts Bay area in south Cornwall, with people woken up by a loud bang from St Just in north Cornwall to Redruth.

Experts said the tremor was within what is expected for the area and is among hundreds in the UK every year.

Linda Dwan, from Mousehole in south Cornwall, said: "There was a rumbling, like thunder and the house shook for about two or three seconds.
https://www.bbc.co.uk/news/articles/c724le759lro.amp
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Indonesia's Mount Merapi Eruption Leaves 11 Climbers Dead and Several Missing
Updated December 3, 2023

Introduction:
(The National) Eleven climbers have been found dead in Indonesia a day after the eruption of Mount Merapi, with rescuers searching for at least 12 others reportedly missing.

The 2,891-metre-high Mount Merapi, on the island of Sumatra, erupted on Sunday, shooting ash plumes as high as 3km and raining debris over nearby villages.

Local and national agency officials raised the number of hikers believed to be on the mountain to 75.

“There are 26 people who have not been evacuated. We have found 14 of them – three were found alive and 11 were found dead,” AFP quoted Abdul Malik, the head of Padang Search and Rescue Agency, as saying a day after the eruption.

A small eruption on Monday led the search being suspended, said Jodi Haryawan, spokesman for the search and rescue team.
Read more here: https://www.thenationalnews.com/world/ ... issing/
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Challenging assumptions: The 8.5-year rhythm of Earth's inner core
https://phys.org/news/2023-12-assumptio ... -core.html
by Tejasri Gururaj , Phys.org
Researchers from China have confirmed the existence of an approximately 8.5-year Inner Core Wobble (ICW) in both polar motion and length-of-day variations, revealing a static tilt of about 0.17 degrees between the Earth's inner core and mantle, challenging traditional assumptions and providing insights into the Earth's internal dynamics and density distribution.

The findings of the study are published in Nature Communications.

The Earth's inner core is a solid, dense sphere composed primarily of iron and nickel. Located beneath the liquid outer core, it spans a radius of about 1,200 kilometers (746 miles). This region plays a crucial role in Earth's geophysical processes, influencing the planet's magnetic field and contributing to the overall dynamics of the Earth's interior.

Understanding the properties and behavior of the inner core is essential for unraveling mysteries related to Earth's structure, seismic activity, and magnetic field.

The ICW refers to the wobbling motion of the Earth's inner core around its rotation axis. This phenomenon is characterized by a periodic oscillation of the inner core's figure axis.

A new study has confirmed that the ICW of Earth has a periodic motion with a cycle lasting approximately 8.5 years. This wobbling motion has been observed in measurements of polar motion, the Earth's rotational axis' periodic movement and length-of-day variations (ΔLOD), and the changes in Earth's rotational speed.
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Iceland volcano erupts after weeks of quake activity

Source: Reuters

OSLO, Dec 18 (Reuters) - The Reykjanes volcano in southwest Iceland erupted on Monday, spewing lava and smoke into the air, after weeks of intense earthquake activity, the country's Meteorological Office said.

Fearing a significant outbreak on the Reykjanes peninsula, authorities last month evacuated the nearly 4,000 inhabitants of the fishing town of Grindavik and closed the nearby Blue Lagoon geothermal spa.
Read more: https://www.reuters.com/world/europe/ic ... 023-12-18/
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weatheriscool wrote: Tue Dec 19, 2023 12:56 am Iceland volcano erupts after weeks of quake activity

Source: Reuters

OSLO, Dec 18 (Reuters) - The Reykjanes volcano in southwest Iceland erupted on Monday, spewing lava and smoke into the air, after weeks of intense earthquake activity, the country's Meteorological Office said.

Fearing a significant outbreak on the Reykjanes peninsula, authorities last month evacuated the nearly 4,000 inhabitants of the fishing town of Grindavik and closed the nearby Blue Lagoon geothermal spa.
Read more: https://www.reuters.com/world/europe/ic ... 023-12-18/
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