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Molnar, Peter
- Geology of Indus Suture Zone of Ladakh
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1 Department of Earth, Atmospheric and Planetary Sciences Massachusette Institute of Technology Cambridge, M.A., US
1 Department of Earth, Atmospheric and Planetary Sciences Massachusette Institute of Technology Cambridge, M.A., US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 2 (1984), Pagination: 125-125Abstract
No Abstract.- The Distribution of Intensity Associated With the Great 1897 Assam Earthquake and Bounds on the Extent of the Rupture Zone
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Authors
Affiliations
1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139, IN
1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 1 (1987), Pagination: 13-27Abstract
The great 1897 Assam earthquake probably was associated with underthrusting of the Indian subcontinent beneath the Shillong Plateau, and as such it absorbed part of India's convergence with the Himalaya. Seeber and Armbruster (1981) concluded that slip occurred on a fault that extended north beneath the Himalaya and south beneath much of what is now Bangladesh and that the east-west dimension of the rupture was 550 km. A reassessment of the information given by Oldham (1899) leads me to favor Oldham's inference that the length of the rupture was only about 200 km. The southern edge of the rupture was more likely at the southern edge of the Shillong Plateau than south of it. The possibility that the rupture extended beneath the Himalaya seems to be permissible but not provable from Oldham's observations. Thus, it would be unwise to assume that the 1897 earthquake released the strain that had accumulated east and west of the Shillong Plateau since the last earthquakes in those areas. Although the risk of a large earthquake in the near future in the segment north of the Shillong Plateau is probably less than that in the segments of the range to the east or west, the 1897 earthquake may not have relieved the strain in that segment as well. Given the evidence that the 1897 earthquake was a very large earthquake, however, it seems unlikely that there will be a repeat of such an event in the next hundred years, or more.- An Examination of Evidence Used to Infer Late Cenozoic "Uplift" of Mountain Belts and other High Terrain: What Scientific Question Does Such Evidence Pose?
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1 Department of Geological Sciences, Cooperative Institute for Research in Environmental Science (CIRES), Univerity of Colorado at Boulder, Boulder, Colorado 80309-0399, US
1 Department of Geological Sciences, Cooperative Institute for Research in Environmental Science (CIRES), Univerity of Colorado at Boulder, Boulder, Colorado 80309-0399, US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 3 (2007), Pagination: 395-410Abstract
Fot virtually every mountain belt and high plateau, as well as for many topographically minor features, a credible, if not outstanding, geologist has asserted that that high tenain lose abruptly in Pliocene and/or Quaternary time. Such suggestions rely on a variety of observations that include paleobotanical finds of plant organs resembling those of taxa that now live lower, recent increases in exhumation, erosion, incision, and/or sediment-accumulation rates, "juventle landscapes," and in some cases no supporting data at all (presumably because the inference has become so widely accepted that supporting evidence is no longer needed). Regions of allegedly recent "uplift" include obviously active belts like the Himalaya and seemingly tectonically dead terrain such as Transantarctic Mountains of Antarctica, the Rocky Mountains of the Western USA, of any part of Australia, as well as belts, like the western Alps, which might be called senile, it not dead yet because rigor mortis has not yet set in. The lack of a globally synchronous change in rates of plate motion in the past few million years denies any suggestion of a globally synchronous, coordinated rise of high terrain a sensible tectonic cause. Thus, although not all inferences of recent increases in mean elevations (or whatever has been meant by the word "uplift")need be false, most surely are Global climate change offers the only globally synchronous process that could mislead so many geologists to infer a recent rise of high terrain. Deciphering how climate change forged a tectonic signature on the landscape remains a challenge for geomorphologists and tectonic geologists alike.Keywords
Cenozoic Uplift, Mountain Belts, High Terrains, Climate.- An Appreciation
Abstract Views :199 |
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Authors
Affiliations
1 Department of Geological Sciences, University of Colorado at Boulder, Boulder, Colorado - 80309, US
1 Department of Geological Sciences, University of Colorado at Boulder, Boulder, Colorado - 80309, US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 2 (2005), Pagination: 252-252Abstract
No Abstract.- The Distribution of Intensity Associated with the 1905 Kangra Earthquake and Bounds on the Extent of the Rupture Zone
Abstract Views :240 |
PDF Views:2
Authors
Affiliations
1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, US
1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, US