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- Rao N. Purnachandra
- National Geophysical Research Institute
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- Kumar M. Ravi
- National Geophysical Research Institute
書誌事項
- タイトル別名
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- Uplift and Tectonics of the Shillong Pl
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説明
Different views prevail regarding the uplift and tectonics of the Shillong Plateau in northeastern India. In light of these, we discuss the cause of the current uplift, the time of initiation of the uplift, and the current tectonic scenario. Various geophysical results indicate that neither a thermal anomaly nor isostatic compensation could have caused the uplift as suggested by many workers in the past. Several coinciding factors point towards a combination of tectonic forces in this unique thrust environment, comprising the Himalayan thrust and the Burmese thrust, to be responsible instead. Stratigraphic evidence suggests that the initiation of the current uplift was during Mio-Pliocene. While most tectonic models attribute the Shillong Plateau uplift to a N-S compressive stress regime, it appears that an E-W compressive stress owing to the Indo-Burman subduction active during that period also aided the uplift by providing the necessary and timely impetus. Even at present, a small component of stress in the E-W direction seems to be operational as inferred from a computation of strain rates and velocity vectors. The predominance of thrust type focal mechanisms and their P axis orientations possibly indicate that the uplift is sustained by compressive forces acting on the plateau from all sides.
収録刊行物
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- Journal of Physics of the Earth
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Journal of Physics of the Earth 45 (3), 167-176, 1997
公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会
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詳細情報 詳細情報について
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- CRID
- 1390001206510108544
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- NII論文ID
- 130003963253
- 10002428873
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- NII書誌ID
- AA00704960
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- ISSN
- 18842305
- 00223743
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- NDL書誌ID
- 4326369
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDLサーチ
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