Intraplate deformation of the Indian subcontinent

被引:201
作者
Banerjee, P. [1 ]
Buergmann, R. [2 ,3 ]
Nagarajan, B. [4 ]
Apel, E. [2 ,3 ]
机构
[1] Wadia Inst Himalayan Geol, Dehra Dun 248001, Uttar Pradesh, India
[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Berkeley Seismol Lab, Berkeley, CA 94720 USA
[4] Survey India, Geodet & Res Branch, Dehra Dun 248001, Uttar Pradesh, India
关键词
D O I
10.1029/2008GL035468
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
While deformation at the Earth's surface primarily occurs along tectonic plate boundaries, major earthquakes have shaken regions deep within continental interiors. Three of the largest ( M > 7.5) historic intraplate earthquakes occurred within the Indian subcontinent, suggesting the possibility of significant intraplate deformation. We consider surface velocities determined from new GPS data collected at 29 continuous GPS stations and 41 survey-mode GPS stations in India between 1995 and 2007 to find a north-south shortening rate of 0.3 +/- 0.05 nanostrain yr(-1), which may be accommodated by 2 +/- 1 mm/yr of more localized convergence across central India. Southward motions at 4-7 mm/yr of sites on the Shillong plateau in northeast India reflect rapid shortening and high earthquake hazard associated with active thrust faults bounding the plateau. The width and magnitude of the elastic strain accumulation field across the Himalaya varies little from similar to 76 degrees-90 degrees longitude, but the strain is more broadly distributed and convergence rates are higher along the eastern similar to 200 km of the range.
引用
收藏
页数:5
相关论文
共 39 条
[1]  
[Anonymous], 2002, GEODYNAMICS
[2]   Convergence across the northwest Himalaya from GPS measurements -: art. no. 1652 [J].
Banerjee, P ;
Bürgmann, R .
GEOPHYSICAL RESEARCH LETTERS, 2002, 29 (13) :30-1
[3]   The size and duration of the Sumatra-Andaman earthquake from far-field static offsets [J].
Banerjee, P ;
Pollitz, FF ;
Bürgmann, R .
SCIENCE, 2005, 308 (5729) :1769-1772
[4]  
Bendick R., 2001, SEISMOL RES LETT, V72, P328, DOI DOI 10.1785/gssrl.72.3.328
[5]   Plate motion of India and interseismic strain in the Nepal Himalaya from GPS and DORIS measurements [J].
Bettinelli, Pierre ;
Avouac, Jean-Philippe ;
Flouzat, Mireille ;
Jouanne, Francois ;
Bollinger, Laurent ;
Willis, Pascal ;
Chitrakar, Gyani Raja .
JOURNAL OF GEODESY, 2006, 80 (8-11) :567-589
[6]   Plateau 'pop-up' in the great 1897 Assam earthquake [J].
Bilham, R ;
England, P .
NATURE, 2001, 410 (6830) :806-809
[7]  
Bird P, 1999, B SEISMOL SOC AM, V89, P1642
[8]   Exhumation and uplift of the Shillong plateau and its influence on the eastern Himalayas:: New constraints from apatite and zircon (U-Th-[Sm])/He and apatite fission track analyses [J].
Biswas, Subrata ;
Coutand, Isabelle ;
Grujic, Djordje ;
Hager, Christian ;
Stoeckli, Daniel ;
Grasemann, Bernhard .
TECTONICS, 2007, 26 (06)
[9]   Deformation during the 12 November 1999 Duzce, Turkey, earthquake, from GPS and InSAR data [J].
Bürgmann, R ;
Ayhan, ME ;
Fielding, EJ ;
Wright, TJ ;
McClusky, S ;
Aktug, B ;
Demir, C ;
Lenk, O ;
Türkezer, A .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2002, 92 (01) :161-171
[10]   Deformation of the North American plate interior from a decade of continuous GPS measurements [J].
Calais, E. ;
Han, J. Y. ;
DeMets, C. ;
Nocquet, J. M. .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2006, 111 (B6)