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Himalayan Earthquakes

  1. Mar 17, 2007 #1
    This is just a shameless plea for people to share their knowledge/ references (web links would be good :smile:) regarding Himalayan Earthquakes. I want to know how and where they are generated, I am particularly interested in the role that the Tibetan plateau has to play.

    So far I have it that India is being subducted beneath Tibet, the crust beneath Tibet seems to be unusually plastic and it is extending at right angles to the subduction. There is debate as to where the strain energy is released which causes earthquakes: people have assumed that the release of compressional strain accumulating close to the Greater Himalaya has been responsible for earthquakes, but now there is a group whi suggest that a 'significant fraction of the southernmost 500 km of the Tibetan plateau participates in driving great ruptures'.

    (Feldl & Bilham, Great Himalayan earthquakes and the Tibetan plateau, Nature, Nov 2006)
     
  2. jcsd
  3. Mar 17, 2007 #2

    Astronuc

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    Start here - http://geology.er.usgs.gov/eastern/plates.html

    The Indian tectonic plate is being pushed north by the African and Australian plates into the Eurasian plate. The Himalayas form part of the region between the Indian plate and Eurasian plate (this includes the Pamirs and Himalayas). The Australian plate is particularly active as is evident from the activity along the Sunda trench along the eastern and southern borders of Indonesia. December 2004 Tsunami - http://iri.columbia.edu/~lareef/tsunami/

    http://geology.er.usgs.gov/eastern/plateref.html

    http://pubs.usgs.gov/gip/dynamic/dynamic.html

    http://pubs.usgs.gov/imap/2800/ - downloadable map


    Massive Himalayan Earthquake Overdue, Scientists Conclude

    Anomalous Intensities in the Gangetic Plain Following Great Himalayan Earthquakes

    This might be of interest, but one has to register.

    Monitoring the Himalayan Earthquake Zone
    http://www.cosmeo.com/videoTitle.cfm?guidAssetId=2DBE65B4-1AE2-48BC-957F-7E0C5F69A599&&nodeid=

    Now somewhere I have some information of Pakistan and India's research.
     
  4. Mar 17, 2007 #3
    thanks astronuc, those links were pretty helpful, the more specific ones to the himalayas especially.

    cheers
     
  5. Mar 17, 2007 #4
    Even more interesting are the things, not published. A friend of mine doing his BSc thesis, found out that the collision of India roughly 50 ma ago with the asian continent resulted in an...accelleration of the plate tectonics
     
  6. Mar 18, 2007 #5

    matthyaouw

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    I wonder what role low angle thrust faults play, as they seem fairly common in large mountain belts.

    Sounds interesting. Are you talking about global changes?
     
  7. Mar 18, 2007 #6
    Not really, I think. The forming of the Himalaya has been thought to be forming a major carbon dioxide sink, because of the increased exposure of the rock to weathering. This would have decreased the CO2 levels in the atmosphere, which would have triggered the transition to cooler climates in the Eocene and ultimately the Quartenary ice age ages.

    Problem is that several fossil leaf stomata proxies independently from each other confirm that the CO2 levels during the Tertiary were already down, comparable to modern levels, I discussed that in another thread. So another beautiful hypothesis down the drain.

    It occurs to me that the devellopments in geologic/ paleo climate research are so rapid and divers that nobody has the overal picture anymore, especially about cleaning up the mess of failed hypotheses, which ideas linger on and poison the minds of future researchers, ultimately making it impossible to discover what really happened.

    edit:
    But concerning the original subject, I'd be very interested in the Pleistocene chronology of the seismic activities. Our little pulsating equator hypothesis for the ice ages would elict a prediction that the most active tectonic periods would be at the onset and termination of interglacials.
     
    Last edited: Mar 18, 2007
  8. Mar 25, 2007 #7

    Astronuc

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    Staff: Mentor

    Pakistan sits astride the tectonic intersection of the India and Arabian plates with the Eurasian plate. As a result they are expected to and do experience some significant earthquake activity.

    Here is the information on the geology and tectonic zones of Pakistan.

    http://www.gsp.gov.pk/pakistan/index.html
    http://www.gsp.gov.pk/pakistan/tectonics_zones.html


    Geological Survey of India
    http://www.gsi.gov.in/


    Finding accessible material about Tibet or in China on-line is very difficult, but one can find articles in ACTA SEISMOLOGICA SINICA published by Springer.

    A tectonic stress map of China and adjacent regions from earthquakes occurred during 2000∼2004


    Present-day Movement and Tectonic Strain Rate Field of Active Crustal Blocks in China Continent in A Window on the Future of Geodesy
    Proceedings of the International Association of Geodesy IAG General Assembly Sapporo, Japan June 30 – July 11, 2003

    But there is this -

    A second look at the geologic map of China: the "Sloss approach"
    http://pvermees.andropov.org/noble/chinasloss/
     
  9. Mar 25, 2007 #8
    Really? Sounds a bit iffy to me. But then agian, do you think this might explain why the Himalayas are higher than the Alps?
     
  10. Mar 25, 2007 #9

    Astronuc

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    Staff: Mentor

    Perhaps there was more energy/force in pushing India into Asia, than Africa into Eruope.
    http://www.scotese.com/indianim.htm

    It would appear that the African plate did not move quite as much or as fast as the Indian plate. Also the Alps was formed with other ranges.

    http://en.wikipedia.org/wiki/Alpine_orogeny

    This might be of interest
    http://www.geophysik.uni-muenchen.de/research/seismics/transalp

    http://titan.minpet.unibas.ch/aliens/smpm/Abstr791.pdf

    http://www.uibk.ac.at/geologie/staff/pu_ortner_en.html

    It appears that there is not shortage of studies on tectonics and mountain formation.
     
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