2014
DOI: 10.1093/gji/ggu146
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Abstract: We present the crustal resistivity structure of the Pamir and Southern Tian Shan orogenic belts at the northwestern promontory of the India-Asia collision zone. The magnetotelluric (MT) data were recorded along a roughly north-south trending, 350 km long corridor from the Pamir Plateau in southern Tajikistan across the Pamir frontal ranges, the Alai Valley and the southwestern Tian Shan to Osh in the Kyrgyz part of the Fergana Basin. In total, we measured at 178 sites, whereof 26 combine broad band and long pe… Show more

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Cited by 48 publications
(23 citation statements)
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References 120 publications
(212 reference statements)
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“…These results are consistent with previous magnetotelluric studies conducted across the epicenters of large (>M 6) inland earthquakes (Mitsuhata et al 2001;Ogawa et al 2001;Tank et al 2003Tank et al , 2005Kasaya and Oshiman 2004;Ichihara et al 2008Ichihara et al , 2014Yoshimura et al 2008;Kaya et al 2009;Umeda et al 2011Umeda et al , 2014Chandrasekhar et al 2012) with the exception that aftershocks occur in a thick sedimentary layer (Uyeshima et al 2005). Note here that the dense magnetotelluric observations occasionally image localized subvertical conductors beneath the active faults (e.g., Unsworth et al 1997;Wannamaker et al 2002;Becken et al 2008;Ikeda et al 2013;Sass et al 2014). These local conductors, which are termed fault zone conductors, were interpreted to be damaged zones characterized by a fluid filled fracture network and altered clay materials.…”
Section: Discussionsupporting
confidence: 91%
“…These results are consistent with previous magnetotelluric studies conducted across the epicenters of large (>M 6) inland earthquakes (Mitsuhata et al 2001;Ogawa et al 2001;Tank et al 2003Tank et al , 2005Kasaya and Oshiman 2004;Ichihara et al 2008Ichihara et al , 2014Yoshimura et al 2008;Kaya et al 2009;Umeda et al 2011Umeda et al , 2014Chandrasekhar et al 2012) with the exception that aftershocks occur in a thick sedimentary layer (Uyeshima et al 2005). Note here that the dense magnetotelluric observations occasionally image localized subvertical conductors beneath the active faults (e.g., Unsworth et al 1997;Wannamaker et al 2002;Becken et al 2008;Ikeda et al 2013;Sass et al 2014). These local conductors, which are termed fault zone conductors, were interpreted to be damaged zones characterized by a fluid filled fracture network and altered clay materials.…”
Section: Discussionsupporting
confidence: 91%
“…Velocities less than 3.4 km s −1 , such as those observed throughout the Tibetan Plateau would be in agreement with the presence of melt from rocks of composition and temperatures that are plausible for Tibet (Hacker et al 2014). Further, this explanation also agrees with magnetotelluric studies in southeast Tibet (Unsworth et al 2004) and in the Pamirs (Sass et al 2014) that observe a conductive layer in the mid-crust, which would be consistent with the presence of melt and/or fluids. A key problem with the idea of melt being the main cause of the low velocities observed across the Plateau is the lack of recent volcanism (e.g.…”
Section: P O S S I B L E C Au S E O F T H E L O W V E L O C I T Y L Asupporting
confidence: 87%
“…Stübner et al . [, ] suggested a similar scenario of collapse of the upper ~35 km of crust in the giant Shakhdara dome at the western margin of the Pamir Plateau into the Tajik‐Afghan basin, based on the compatibility in the kinematics and amount of strain (extension in the gneiss dome and shortening across the basin), timing of extension and shortening (Miocene and Pliocene), and the likely presence of low viscosity, partially molten crust starting at ~15 km depth beneath the southern Pamir Plateau [ Sippl et al ., ; Stearns et al ., ; Sass et al ., ; see below]. Our seismic record and the GPS data show that this process is ongoing and has prograded northward, incorporating the entire western Pamir, albeit with diminished rates and a change of σ 1 from vertical in the Miocene‐Pliocene (during the formation of the Shakhdara dome) to subhorizontal at present.…”
Section: Discussionmentioning
confidence: 99%