GPS measurements indicate rapid lateral extrusion of the NE Tibetan Plateau, which causes active NE-directed crustal shortening and has initiated oblique shearing along margins Tibet. However, highlands terminate around 103°E longitude topographic relief disappears to northeast. The exact reasons for this drop in elevation remain obscure due widespread Tertiary sediments Quaternary loess, details lithospheric structure. This study describes a new 310 km-long deep seismic reflection line...

An east–west trending, high-density seismic array was deployed along the eastern margin of Tibetan Plateau to investigate its eastward expansion. The 160 km long spans Ruoergai basin, Minjiang fault, Minshan Mountains, Tazang and West Qinling. included 330 short-period seismographs spaced at 500 m intervals, which recorded teleseismic 3-component waveforms over a one month period. P-wave receiver functions calculated from 35 events provided an image crustal structure. results show massive...

Abstract Himalayan tectonic activity is triggered by downward penetration of the Indian plate beneath Asian plate. The subsurface geometry this interaction has not been fully investigated. This study presents novel constraints on provided two newly obtained, deep seismic reflection profiles. profiles cover 100- and 60-km transects across Yarlung-Zangbo suture Himalaya-Tibet orogen at c. 88°E. Both show a crustal-scale outline subducting crust. clearly shows understhrusting southern Tibet,...

Abstract Strain distribution inferred from rock exhumation history could provide significant insights into the geodynamic models proposed for explaining late Cenozoic outward growth of Tibetan Plateau. In this work, we present a new thermochronological data set to constrain eastern margin Plateau (i.e., Min Shan and adjacent areas) long‐term dip‐slip rates boundary faults, including Huya fault in plateau Minjiang hinterland. The shows evident age diachroneity between different sides with...

Abstract Most previous studies of the Tibetan Plateau have focused on processes crustal thickening and subsequent outward growth. However, lithospheric structure across tectonic boundaries plateau has not yet been fully imaged, therefore, how geological structures evolved in association with lateral expansion margins remains unclear. Here together interpretation regional aeromagnetic anomalies, we employ a recently acquired 165 km long deep seismic reflection image that crosses northeastern...

Abstract Based on a dense linear seismic array traversing the eastern margin of Tibetan Plateau into Qinling Belt, we conducted joint inversion receiver functions and surface wave dispersion curves under P velocity constraints simultaneously derived crustal uppermost mantle Vs profile with Vp/Vs profile. Our observations indicate that which lower crust exhibits values less than 1.8 are indicative an intermediate to felsic composition, is currently not serving as channel accommodating...

Southernmost Tibet exhibits an anomalously twice the normal thickness of average continental crust. There is no available theory to explain and driving mechanism remains uncertain. Here, we interpret a north-striking, 180 km-long deep seismic reflection profile traversing southern Lhasa terrane (SLT) central (CLT). In addition reflections showing subducting Indian crust, our results reveal lateral heterogeneity between SLT CLT, where north-dipping beneath CLT outline tilted crystalline...

The Late Oligocene-Early Miocene epoch represents a critical stage in the collisional history of India-Eurasia dominant collision zone. Within this timeframe, set tectonic events occurred simultaneously or progressively. However, key responsible for triggering these nearly coeval remains unclear. This study used an integrated analysis both geological and geophysical data to document interactions throughout Himalayan Orogenic Belt from west east. Deep seismic reflection profiles outline...

Abstract Global Positioning System (GPS) measurements across eastern Tibet reveal a sharp velocity gradient zone located about 150 km west of the Longmen Shan frontal thrust zone, where eastward block motion decreases from ~12 mm/yr to ~3 over distance less than 10 km. In order investigate tectonic cause for this rapid change in GPS velocity, together with systematic review on available geological and geophysical data easternmost Tibet, we provide new constraints feature Longriba fault...

Terra Nova, 24, 339–350, 2012 Abstract Studies of regional plate‐scale processes that may influence the exhumation ultra‐high pressure (UHP) metamorphic rocks are few despite their potential importance. Here, we review and summarize available age constraints along with Qinling‐Dabie Shan orogen, which separates North China Block (NCB) from South (SCB). We find collision‐related events in west extension‐related east, where large Dabie UHP terrane is located, were contemporaneous. Available...

Abstract The ongoing collision between India and Eurasia has created the Tibetan Plateau, which features high elevations large crustal thicknesses. easternmost portion of plateau long been a key region for studying uplift mechanism especially after 2008 Ms . 7.9 Wenchuan earthquake. However, previous studies have assumed that Tibet is tectonically homogeneous, tectonic significance Min Shan overshadowed by its more conspicuous neighbour, Longmen region. Here, we describe geometry using two...

The mechanism for uplift of the eastern Tibetan Plateau is still a matter debate. There are two main models: extrusion and crustal flow. These models have been tested by surface observations, but questions about remain. In addition, devastating 2008 Mw 7.9 Wenchuan earthquake along Longmen Shan fault zone (LMSFZ) reminds us that tectonic activity within Tibet complex poses major natural hazard. This accompanied dramatic LMSFZ, only minor convergence (<4 mm year–1) against Sichuan basin...

AbstractOn 12 May 2008 and 20 April 2013, respectively, the devastating magnitude 7.9 (Wenchuan) 7.0 (Ya'an) earthquakes struck southwestern Longmen Shan fault zone (LMSFZ), eastern margin of Tibetan Plateau. These events were notable because they occurred in a heavily populated area resulted severe damage loss life. Here we present an integrated analysis potential field anomalies crustal-scale seismic reflection image to investigate crustal structure some tectonic relationships associated...

探测揭示了青藏高原的地壳增厚具有低P波速度、低 电阻率和高热流值的特点, 且发现了其中下地壳的低剪切波速度 [1] .确实, 大量的地球物理学观测发现 了青藏高原中东部下方中下地壳中广泛存在着大片 的高导低速(Vs<3.3 km/s

Abstract The run‐off volume altered by the construction of hydropower plants affects ecohydrological processes in catchments. Although impacts large have been well documented literature, few studies conducted on small cascaded (SCHPs). To evaluate SCHPs river flow, we chose a representative basin affected projects and, to lesser degree, other human activities, that is, Qiuxiang River Southern China. observed discharge and climate data during period 1958–2016 were investigated. datasets...

The eastern Tibetan plateau has been getting more and attention because it combines active faults, uplifting, large earthquakes together in a high-population region. Based on the previous researches, most of Cenozoic tectonic activities were related to regional structure local blocks within crustal scale. Thus, better understanding is an important topic for further study. In this paper, we combined simple Bouguer gravity anomaly with Moho depths from studies investigate area. To highlight...

Abstract The M 7.0 Haiti earthquake of 2010 in the Greater Antilles is a reminder that northeastern Caribbean at high risk for seismic and tsunami hazards. consist Hispaniola microplate to west Puerto Rico–Virgin Islands east are situated between two subduction zones with Rico Trench north Muertos Trough south. Although there no active volcanism on Rico, depths previous tomography results imply slabs North American Plates exist depth. However, how far Plate has extended not been fully...