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發表於 2008-5-18 09:24 PM
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其實係有關係的，請大家多注意 greenhouse gas 問題
The May-12 Richter-7.9 earthquake in the Sichuan province of China may be caused by glacier-melting caused in turn by global warming. The result is so common it even has a name “glacial earthquake”. The Sichuan earthquake could be one of these glacial earthquakes, and if so certainly not the first one, nor the last.
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Relevant to Sichuan are the Himalayas. Himalayan glaciers have shrunk due to three factors:
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· Higher temperature thaws the glaciers. According to the International Center for Integrated Mountain Development (ICIMOD), “The average temperature in the Himalayas in the northern part of Nepal rose about 2 degrees between 1970 and 1994; in the rest of Nepal, more than 3 degrees.”
. |5 M, P# Y7 n· Global warming changes snow into rain that melts the glaciers, and form glacial lakes · The amount of snowfall has decreased.
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; }* m9 J8 p4 W: u5 g& A9 h7 P: z" BThe Nepalese Himalayas alone contain more than 3,000 glaciers, each kilometers long and hundreds of meters wide, weighing billions of tons. There are approximately 70 extra-large glaciers in Himalaya, covering about 166 km2 or 17% of the mountain area.
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$ i- U* z) X- @5 ~$ I& MWith glacier meltdown comes weight redistribution on a mammoth scale.9 w+ M# d5 l0 a' h3 Q9 i& i) T
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The melting of these glaciers has been accelerating.# K7 h, o2 a4 q3 Y) w7 M- M* S
" z8 R, i( b# T: l· Thickness-wise, in the period of 2000-2004, a thinning of about 10 m occurred below 4000 m altitude, and 2 m above 5000 m.
- [6 Q2 X" |# M9 k· Length-wise, the Chhukhung Glacier, for example, retreated at about 5 m per year in the late 1970s, which increased to about 20 m per year in and after the 1990s.
# h- O5 w0 \. A+ B· Weight-wise, the shrinking of the AX010 Glacier, which accelerated from 2.7 m per year in the 1980s to 12.5 m in and after the 1990s, resulted in the loss of more than 1 million tons of ice in 20 years through 1999." r, d# {% L, ^9 D Z
. O/ x( v5 Q" ~0 mThe Himalayas and the surrounding mountain ranges are not the most geologically stable region to begin with. The northward incursion of the Indian subcontinent into SE Asia continues and the Himalayas continue being built and elevated, as does the folding of the surrounding ranges, including those in the Sichuan province of China where the earthquake occurred. The redistribution of weight by the glacier melting will cause seismic events in areas where ill-settled sub-plates hang on to each other by their fingernails as it were, slipping violently against each other at the slightest disturbance.
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( H0 r0 _/ X/ M z. @4 j: x' |4 ~If the above is true, then we can expect more devastating earthquakes to come. Likewise, it can be predicted that the massive melting of the Greenland and Antarctic land-ice will generate earthquakes in and around these regions.
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5 j8 n( w$ C! L: p5 LAnthony Marr, founder and president
9 q H2 F8 h5 [Heal Our Planet Earth (HOPE)
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& i1 o# P! W6 M$ Q- d; g& {http://www.all-creatures.org/hope/let-20080513-1.htm
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[ Last edited by jublio on 2008-5-18 at 09:30 PM ] |
http://www.btzonebt.com/airways/viewthread.php?tid=172994&extra=page%3D1 |
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