Various dynamic models have been proposed to explain the uplift and faulting behaviors of the TP. 69) of normal, strike-slip, and thrust events are plotted as red-, black-, and blue-filled beach balls, respectively. Focal mechanisms (GCMT M W > 4.0 1980 to 2021 and ref. Red and blue-filled patches are regions with predominantly lateral dilatational and compressional strain rates. Fault slip rates along the Altyn Tagh fault (ATF), KLF, ELKF, GYF, and XSHF ( 15, 54– 56) are labeled. Historical events and the 2021 Maduo earthquake are plotted as black and red focal mechanisms, respectively. Regional normal, strike-slip, and thrust faults are plotted as red, white, and black curves ( 68), respectively. Terrane boundaries, i.e., sutures and major faults, are plotted as thick red and white curves. ( A) The distribution of maximum shear strain rates ( 14) is plotted as a colored map in the background. A dashed line in the southwest-northeast direction marks the sidewall of Fig. Terranes of the TP and surrounding blocks are plotted as red- and black-bounded polygons. The study area is identified in the Top Right Inset map. Understanding this problem will also provide insights into the building and deformation mechanism of the plateau.įig. It is generally recognized that the deformation mode transits from dilatational in central Tibet to compressional at the northeast plateau margin, and yet how this transition occurs and its long-term impact on the plateau growth are not well understood. Deformation is distributed over the plateau in several geological units, including the Lhasa (LS) terrane, Qiangtang (QT) terrane, Songpan-Ganzi (SG) terrane, and Qaidam (QDM) basin, which are bounded by several suture zones and faults, including the Bangong-Nujiang suture (BNS), Jinsha suture (JSS), and Kunlun fault (KLF), respectively ( Fig. While the northeast deformation front is building the Qilian Mountains, the central plateau involves eastward extrusion ( 2, 3). The continental collision has resulted in the TP growing toward the northeast and caused the movement of several blocks, including the Tarim Basin, Sichuan Basin, and Ordos block ( Fig. The TP is a consequence of the collision between the Indian Plate and the Eurasia Plate that began ∼55 Ma ( 1). One outstanding issue is the mechanism that built this large area (2,500,000 km 2), high elevation (∼5 km), and relatively top-flat plateau ( Fig. The unique tectonic setting of the SGT defines locations and behaviors of internal faulting and strong earthquakes such as the 2021 Maduo earthquake, with the latter occurring on slow-moving faults at intervals of several thousands of years.Īs the highest plateau in the world, the Tibetan Plateau (TP) attracts broad attention from Earth scientists. The SGT receives lateral shear loading from its NS boundary and accommodates a right-step sinistral motion across the terrane boundary faults. We analyze geological, seismic, and geodetic evidence and find that the SGT upper crust shows distributed shear deformation and distinct transverse anisotropy, which are associated with folded structures originating from compression of the paleo-Tethys ocean accretional prism realigned by following shear deformation.

We interpret this distinct rupture behavior to be the result of the respective slip concentration depths of the two ruptured segments. We conduct a joint inversion for this earthquake and resolve a bilateral rupture process, which is characterized by super- and subshear rupture velocities, respectively. The 2021 Mw 7.4 Maduo earthquake, which occurred inside the Songpan-Ganzi terrane (SGT) in central-east Tibet, provides a chance to evaluate the associated deformation mode of the region. Block motion and viscous flow models have been proposed to describe the deformation field but are not fully supported by modern geophysical observations. With out attribution just buy an commercial licence.Redistribute is forbidden.The deformation mode of the Tibetan Plateau is of crucial importance for understanding its construction and extrusion processes, as well as for the assessment of regional earthquake potential. Please buy a commercial licence for commercial use without attribution.įree for commercial with attribution. You can use this graphic design for commercial with attribution to. Reference Links To Resources (Which Web Site Captch This Resource) eps ) vector illustration graphic art design format ai ) vector illustration graphic art design format, Encapsulated PostScript eps (. Abstract Wave Background Curve Color Creative Graphic Backdrop Line Light Concept Colorful Smooth BrightĪdobe Illustrator ai (.

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