globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228801
论文题名:
Seismotectonics and stress perspective of the Kumaon Himalaya: A geophysical evidence of a Lesser Himalayan duplex
作者: Hajra S.; Hazarika D.; Kumar N.; Pal S.K.; Roy P.N.S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 806
语种: 英语
中文关键词: Focal mechanism solution ; Kumaon Himalaya ; Lesser Himalayan Duplex ; Seismotectonics
英文关键词: Chromium compounds ; Compressive stress ; Faulting ; Friction ; Centroid moment tensors ; Fault orientations ; Frictional coefficients ; Geophysical evidence ; Main himalayan thrusts ; Seismically active zones ; Strain localizations ; Stress and deformation ; Earthquakes ; centroid moment tensor ; duplex ; earthquake event ; focal mechanism ; kinematics ; seismic method ; seismicity ; seismotectonics ; stress field ; Himalayas ; India ; Kumaun Himalayas ; Lesser Himalayas ; Uttarakhand
英文摘要: The Kumaon Himalaya lies in the central seismic gap and therefore bears the potential to host a great Himalayan earthquake. The seismicity and seismotectonics of the Kumaon Himalaya and the adjacent region have been investigated based on local earthquake data recorded at 18 seismological stations. The seismically active zone of the eastern segment of the Kumaon Himalaya deviates from the usual pattern of seismicity in the Himalayan Seismic Belt of the NW Himalaya. Shallow-focus earthquakes in this region largely concentrate in the Chiplakot Crystalline Belt (CCB) immediately south of the Vaikrita Thrust. The Focal Mechanism Solutions of 41 earthquakes computed through waveform inversion technique along with the solutions of 12 earthquakes obtained from the Global Centroid Moment Tensor solution catalog are used to investigate the kinematics of the region. The study reveals a complex faulting pattern in the Inner Lesser Himalaya. The stress inversion results show a widely distributed stress pattern and low frictional coefficient which are attributed as one of the major causes of clustered seismicity observed in the CCB. Careful examination of the fault orientations indicate the presence of a hinterland dipping Lesser Himalayan Duplex over the ramp structure on the Main Himalayan Thrust. The high compressive stress and deformation rate in the CCB are partially accommodated by this duplex structure. The large concentration of shallow-focus earthquakes in the CCB is the result of the presence of fluid-rich zone as well as strain localization and large stress build-up due to locking in the ramp structure on the Main Himalayan Thrust beneath the CCB. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170816
Appears in Collections:气候变化与战略

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作者单位: Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248 001, India; Indian Institute of Technology (ISM) Dhanbad, Jharkhand, 826004, India; Indian Institute of Technology (IIT) Kharagpur, West Bengal, 721302, India

Recommended Citation:
Hajra S.,Hazarika D.,Kumar N.,et al. Seismotectonics and stress perspective of the Kumaon Himalaya: A geophysical evidence of a Lesser Himalayan duplex[J]. Tectonophysics,2021-01-01,806
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