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DOI	10.1016/j.tecto.2021.228969
	Magnetotelluric evidence for trapped fluids beneath the seismogenic zone of the Mw6.0 Anjar earthquake, Kachchh intraplate region, Northwest India
	Nagar M.; Pavankumar G.; Mahesh P.; Rakesh N.; Chouhan A.K.; Nagarjuna D.; Chopra S.; Kumar M.R.
发表日期	2021
ISSN	00401951
卷号	814
英文摘要	Lithospheric rheological heterogeneities across a rift play a significant role in intraplate deformation and seismic activity. The Kachchh rift in the northwestern part of the India has not only experienced lithospheric stretching but also witnessed large magnitude devastating earthquakes. Here, we present the results of a magnetotelluric (MT) investigation carried out in the southeastern part of the Kachchh intraplate region illuminating the seismogenic zone of the 1956 Anjar earthquake (Mw 6.0). The two-dimensional geoelectrical model derived from the MT data acquired at 21 sites along a NE-SW profile reveals assemblage of conductive and resistive zones in the upper and the mid crustal depths in the close vicinity of the major fault zones and the hypocentral depths. The results reveal a very high conductive zone near the Moho, affirming the presence of an upper mantle fluidized zone. Unlike the South Wagad Fault, the Kachchh Mainland Fault and the Katrol Hill Fault do not have a downward lower crustal extension, and terminate at the mid crustal depths. We suggest that the presence of trapped fluids in the brittle-ductile transition zone (12–15 km) and their seepage to the resistive plutons might be a possible mechanism for triggering the 1956 event as well as the current seismic activity in the region. © 2021 Elsevier B.V.
关键词	Anjar earthquake Fluids Intraplate seismicity Magnetotellurics Trapped magma
英文关键词	Faulting; Fluidization; Magnetotellurics; Seismographs; Brittle-ductile transition zone; Crustal extension; Geoelectrical modeling; Hypocentral depth; Possible mechanisms; Resistive zones; Seismic activity; Seismogenic zones; Earthquakes; earthquake event; earthquake trigger; fluid; intraplate process; magma; magnetotelluric method; seismicity; Gujarat; India; Kutch
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208040
作者单位	Institute of Seismological Research, Raisan, Gandhinagar, 382 009, India; CSIR-National Geophysical Research Institute (CSIR-NGRI), Uppal Road, Habsiguda, Hyderabad, 500 007, India; Department of Earth Sciences, Gujarat University, Ahmedabad, India; CSIR-National institute of Oceanography (CSIR-NIO), Dona Paula, Goa, 403004, India
推荐引用方式 GB/T 7714	Nagar M.,Pavankumar G.,Mahesh P.,et al. Magnetotelluric evidence for trapped fluids beneath the seismogenic zone of the Mw6.0 Anjar earthquake, Kachchh intraplate region, Northwest India[J],2021,814.
APA	Nagar M..,Pavankumar G..,Mahesh P..,Rakesh N..,Chouhan A.K..,...&Kumar M.R..(2021).Magnetotelluric evidence for trapped fluids beneath the seismogenic zone of the Mw6.0 Anjar earthquake, Kachchh intraplate region, Northwest India.Tectonophysics,814.
MLA	Nagar M.,et al."Magnetotelluric evidence for trapped fluids beneath the seismogenic zone of the Mw6.0 Anjar earthquake, Kachchh intraplate region, Northwest India".Tectonophysics 814(2021).