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作者: cwing   水深火热,字面意义上的,顶刊Geology:黑龙江五大连池死火山复活 2020-06-23 01:12:17  [点击:1573]
水深火热,字面意义上的,顶刊Geology:黑龙江死火山复活
用国运给党运续命,
叫党多活了这几年,
值吗?
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中国再陷危机?黑龙江死火山沉睡50万年又复活(图)

2020-06-23 10:28

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火山 黑龙江 爆发
中国官方以3D图示意“尾山火山”地表下有2个巨大的岩浆库。(图片来源:中国中科院截图)

【看中国2020年6月23日讯】(看中国记者黎小葵综合报导)近期的一项研究发现,位于黑龙江“五大连池火山区”、已沉睡50万年的火山竟然复活,目前其地表下的岩浆正处于活跃状态,迄今熔融程度至少为15%,若达到40%时,该火山就会爆发。

英国《每日邮报》报导,黑龙江省“五大连池火山区”的一座名为“尾山火山”,在50万年前曾一度火山爆发,但之后被判定,它几乎不会再喷发或出现相关地质活动。然而,近期中国科学家却发现,“尾山火山”地表下有2个巨大的岩浆库,它们似乎即将“复活”。

报导指出,在此之前,地质学家一直将精力集中在同处东北地区的长白山火山,因为长白山火山于公元946年曾喷发,那次喷发是全球几千年来最强大的火山爆发事件。不过,此次最新研究发现,长白山火山和“尾山火山”有“一定程度上的关联”。

中国中科院官网也证实了此事。并进一步说明,这项研究是由中国科学技术大学教授张海江研究组与中国地质调查局水文地质环境地质调查中心合作完成。他们利用布设在“尾山火山”周围密集分布的大地电磁台站,首次获得“尾山火山”下方20公里深的三维高分辨率电阻率结构。

不过,在这过程中,他们发现,在火山锥下方约3至4公里以下,存在非常明显的低电阻率异常,并进一步观察后发现,在“尾山火山”所在之处的地壳上层与中层,各存在一个岩浆库,“两者通过垂直通道相互连接”,即地壳中层的岩浆不断往地壳上层输送岩浆。

中国中科院还指出,中国东北地区是中国新生代火山最多的地区,包括著名的长白山火山和五大连池火山区。其中,五大连池火山区包括14座火山,最近的火山喷发发生在1719年至1721年,分别形成老黑山和火烧山。


根据中国官方统计,目前“尾山火山”2个岩浆库内部的熔融程度至少为15%,正处于“充电”的活跃状态,如果岩浆库熔融程度达到约40%,就达到火山爆发临界值,因此有必要继续监测该地区的火山活动,以预测未来火山喷发的可能性。

据了解,这项研究已于2020年6月1日发布在国际地学期刊《地质学》(Geology)上 。
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https://www.dailymail.co.uk/sciencetech/article-8437695/Volcano-China-believed-extinct-recharging-eruption.html
Volcano in China that was believed to be extinct may now be 'recharging,' experts say after discovering chambers filled with molten lava beneath the surface

Experts created a 3D map underneath the Wieshan volcano in China
The volcano last erupted 500,000 years ago and was said to be extinct
Following the analysis, the team found two chambers filled with molten rock
Magma was found to occupy 15 percent of the chambers
Studies have suggested a chamber needs to be filled 40 percent for an eruption

The Wieshan volcano, which sits in northeast China, was considered extinct – until now.

Scientists believe the volcano that last erupted over 500,000 years ago may be 'recharging' after discovering two huge magma chambers beneath the surface.

Wieshan is part of the Wudalianchi volcanic field that stretches 193 square miles and consist of 14 cinder cones surrounded by lava flows.

The team captured a 3D image under Wieshan, allowing them to see chambers in the upper and middle crust filled with magma.

Calculations show that 15 percent of the upper chamber is now occupied by molten rock –studies have suggested an area needs to be at 40 percent for the volcano to erupt.

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The Wieshan volcano, which sits in northeast China, was considered extinct – until now. Scientists believe the volcano that last erupted over 500,000 years ago may be 'recharging' after discovering two huge magma chambers beneath the surface

The Wieshan volcano, which sits in northeast China, was considered extinct – until now. Scientists believe the volcano that last erupted over 500,000 years ago may be 'recharging' after discovering two huge magma chambers beneath the surface

'Considering the significant melt fractions and active earthquakes and tremors occurring around magma reservoirs, the Weishan volcano is likely in an active stage with magma recharging,' reads the study published by the University of Science and Technology of China in GeoScienceWorld.

'Therefore, it needs more active monitoring for better forecasting of its potential future eruptions.'
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Prior to the discovery, geologists have kept their focus on Changbai, or also known as Paektu Mountain, to the south.

This volcano erupted in 946 AD and is deemed one of the most powerful volcanic events on record – the fallout zone stretched from Japan to Greenland, South China Morning Post reports.
The team captured a 3D image under Wieshan, allowing them to see chambers in the upper and middle crust filled with magma

The team captured a 3D image under Wieshan, allowing them to see chambers in the upper and middle crust filled with magma

However, researchers in the latest study theorize that the volcanic fields of Changbai and Wieshan, or Wei, 'would be linked to some degree.'

To conduct the investigation into Wei, the team used sensors to create a 3D map of what lies below the structure.

And this method led to the discovery of the two magma filled chambers.

Researchers believe the middle crust may be a source to 'recharge the magma chamber in the upper crust.'

The team noted that seismic activity had increased at Changbai from 2002 to 2005, suggesting 'magmatic activity beneath the volcano was increased'.

And its most recent eruption was in 1903.

Researcher noted in the study that the 'volcanic activity in northeast China is likely to be in an active stage, and active volcanic monitoring is needed to further understand the magmatic systems in this region'.
Wie Mountain sits in the northeast region of China and north of Chanbai Mountain

Wie Mountain sits in the northeast region of China and north of Chanbai Mountain
Calculations show that 15 percent of the upper chamber is now occupied by molten rock –studies have suggested an area needs to be at 40 percent for the volcano to erupt

Calculations show that 15 percent of the upper chamber is now occupied by molten rock –studies have suggested an area needs to be at 40 percent for the volcano to erupt

However, other experts not involved with the study are skeptical about the findings.

Xu Jiandong, director of the volcanic research division at the China Earthquake Administration in Beijing, told South China Morning Post: 'If there really are huge magma chambers in the area, we should have detected some related seismic activities – when the lower chamber recharges the upper one, there should be some movement.'

'But so far, after decades of monitoring on the site, we've picked up almost nothing. The whole area has been very, very quiet.'
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Volcano in northeast China may be ¿recharging¿ for eruption, study finds | South China Morning Post

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