Displacement-based analysis and design of rocking structures     

Natalia Reggiani Manzo  Michalis F. Vassiliou 《地震工程与结构动力学》2019,48(14):1613-1629

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Terrace pediments in Makhtesh Ramon,central Negev,Israel     

Josef Plakht  Natalia Patyk‐Kara  Nina Gorelikova 《地球表面变化过程与地形》2000,25(1):29-39

Terrace pediments occupy approximately 30 per cent of the bottom of the Makhtesh Ramon erosional cirque in the central Negev Desert, Israel. River terraces and terrace pediments are genetically connected landforms, where each terrace pediment corresponds with a fluvial terrace of the same relative height. A pediment and river terrace constitute a geomorphic pair and should be regarded as chronometrically synchronous morphological elements. The formation of the terrace pediment staircases is controlled mainly by local base level changes. The present‐day configuration and overall morphology of Makhtesh Ramon formed in the early stages of its development by both stream erosion and subsequent pedimentation. Less significantly, modification by intermittent erosion alternating with periods of stability, resulted in deepening of the Makhtesh Ramon bottom. The present‐day stepped relief throughout the Makhtesh valley is, thus, a composite feature. The overall rate of terrace pediment formation in Makhtesh Ramon ranges from 0·05 to 0·10 mm a⁻¹. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Balanced cross-section restoration in a complicated folded hinterland structure: Shilbilisaj profile,Talas ridge,Caledonian Tien Shan     

Fedor Yakovlev  Krzysztof Gaidzik  Viacheslav Voytenko  Natalia Frolova 《地学学报》2023,35(1):1-14

Conventional cross-section balancing techniques based on layer length measuring can be applied only for foreland structures. To analyse complicated hinterland structure with numerous small-scale folds, this balancing technique requires the reliable and detailed tracing of the morphology of any layer throughout the cross-section, which is unattainable. We present a special kinematic method of balancing cross sections based “on the geometry of the folded domain” which enables the structural restoration of hinterland regions. We apply the method to restore the detailed structural section along the Shilbilisaj River, having a length of 26 km. We divided this section into 40–60 so-called “domains” each including 2–7 folds. Our method uses the fold's morphology to determine the strain ellipsoid, which describes the deformation of each domain and is used to restore its pre-folded state. By combining the pre-folded states of the domains, we reconstruct the entire profile, and calculate shortening values as K = L₀/L₁ (initial to final length). The overall shortening value for the profile is 4.49, incrementally varying along the section from 3.79 to 5.53. The comparable results of two independently performed reconstructions emphasize the reliability of the applied balancing method.  相似文献