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71.
DU Guoliang ZHANG Yongshuang YANG Zhihu Javed IQBAL TONG Bin GUO Changbao YAO Xin WU Ruian 《《地质学报》英文版》2017,91(2):658-668
The eastern Himalayan syntaxis is one of the most tectonically active and earthquake-prone regions on Earth where earthquake-induced geological disasters occur frequently and caused great damages. With the planning and construction of Sichuan-Tibet highway, Sichuan-Tibet railway and hydropower development on the Yarlung Zangbo River etc. in recent years, it is very important to evaluate the seismic landslide hazard of this region. In this paper, a seismic landslide hazard map is produced based on seismic geological background analysis and field investigation using Newmark method with 10% PGA exceedance probabilities in future 50 years by considering the influence of river erosion, active faults and seismic amplification for the first time. The results show that the areas prone to seismic landslides are distributed on steep slopes along the drainages and the glacier horns as well as ridges on the mountains. The seismic landslide hazard map produced in this study not only predicts the most prone seismic landslide areas in the future 50 years but also provides a reference for mitigation strategies to reduce the exposure of the new building and planning projects to seismic landslides. 相似文献
72.
Natural Hazards - New mapping through geomorphic analysis of tectonic landforms using a variety of freely available satellite data, including shuttle radar topography and Google Maps, has revealed... 相似文献
73.
Akram Alizadeh Margarita López Martínez Khalil Sarkarinejad 《Comptes Rendus Geoscience》2010,342(11):837-846
Exhumation of the Tutak mantled gneiss dome without significant cooling has taken place in a doubly plunging anticline within the Sanandaj-Sirjan HP-LT metamorphic belt in the Zagros Thrust System of Iran. Reconstruction of structural evolution of the Tutak gneiss dome at the contact between Arabian and Iranian plates by 40Ar/39Ar geochronology exhibits history of the closure of Neo-Tethyan Ocean. There are two granites of different ages in the core of dome; the oldest corresponds to the central Iranian continental crust and was deformed at about 180 Ma. The younger granite was emplaced in the NE–SW transpression system. The timing of strain-related fabrics and exhumation history of the region illustrates the closure of Neo-Tethys and beginning of continent-continent collision at about 77 Ma, as constrained by a well defined plateau 40Ar/39Ar age obtained on biotite. Then, the biotite age corresponds to the second stage of emplacement of the Bendenow granite-gneiss which illustrating repeated orogenic events. Continuing deformation without interruption that by now has been created at about 77 Ma, was largely restricted to the transpression and high proportion of simple shear components relative to the pure shear components along the NE–SW. 相似文献
74.
75.
A semi-analytical time integration method is proposed for the numerical simulation of transient groundwater flow in unconfined aquifers by the nonlinear Boussinesq equation. The method is based on the analytical solution of the system of ordinary differential equations with constant coefficients. While it is unconditionally stable and more accurate than the finite difference methods, the computational cost is much more expensive than (can be more than 10 times) that of the finite difference methods for a single time step. However, by partitioning the nonlinear parameters into linear and nonlinear parts, the costly computation can be performed only once. With larger and less variable time step sizes, the total computational cost can be significantly reduced. Three examples are included to illustrate the advantages and limitations of the proposed method. 相似文献
76.
Michio Morino Javed N. Malik Prashant Mishra Chandrashekhar Bhuiyan Fumio Kaneko 《Journal of Earth System Science》2008,117(3):181-188
Several new active fault traces were identified along Katrol Hill Fault (KHF). A new fault (named as Bhuj Fault, BF) that
extends into the Bhuj Plain was also identified. These fault traces were identified based on satellite photo interpretation
and field survey. Trenches were excavated to identify the paleoseismic events, pattern of faulting and the nature of deformation.
New active fault traces were recognized about 1km north of the topographic boundary between the Katrol Hill and the plain
area. The fault exposure along the left bank of Khari River with 10m wide shear zone in the Mesozoic rocks and showing displacement
of the overlying Quaternary deposits is indicative of continued tectonic activity along the ancient fault. The E-W trending
active fault traces along the KHF in the western part changes to NE-SW or ENE-WSW near Wandhay village.
Trenching survey across a low scarp near Wandhay village reveals three major fault strands F1, F2, and F3. These fault strands
displaced the older terrace deposits comprising Sand, Silt and Gravel units along with overlying younger deposits from units
1 to 5 made of gravel, sand and silt. Stratigraphic relationship indicates at least three large magnitude earthquakes along
KHF during Late Holocene or recent historic past. 相似文献
77.
Elbeltagi Ahmed Salam Roquia Pal Subodh Chandra Zerouali Bilel Shahid Shamsuddin Mallick Javed Islam Md. Saiful Islam Abu Reza Md. Towfiqul 《Theoretical and Applied Climatology》2022,149(1-2):131-151
Theoretical and Applied Climatology - Urban groundwater resources (GWRs) have declined substantially in recent decades, due to rapid urbanization, population growth, groundwater exploitation, land... 相似文献
78.
Azad Md. Abul Kalam Islam Abu Reza Md. Towfiqul Ayen Kurratul Rahman Md. Siddiqur Shahid Shamsuddin Mallick Javed 《Theoretical and Applied Climatology》2022,148(3-4):1261-1278
Theoretical and Applied Climatology - Understanding changes in monsoon precipitation patterns is crucial as it determines the occurrence, intensity, and duration of floods and droughts in... 相似文献
79.
Land use/land cover change is a global phenomenon which reflects natural resources degradation and/or utilization. Remote sensing and GIS have been widely used to monitor such changes at watershed level. The present study evaluates the LU/LC change during 1989 - 2001 in a semi-arid watershed of central India. Geocoded satellite data of 1989 and 2001 on 1:50,000 scale, were visually interpreted to prepare thematic maps which were later digitized using ArcGIS softwares. The analysis shows that vast tracts of cultivated land have become uncultivated and at some places even converted to wasteland. However, the land under dense forest and open forest has decreased due to expansion of built-up land and other anthropogenic activities. Increase in area of uncultivated land, wasteland and decrease in cultivated land and open scrub is also supported by rainfall analysis, which shows a declining trend and a fall of 186.93 mm in average annual rainfall for 1986-2003 period. The change detection map prepared using land use/land cover of 1989 and 2001 as inputs shows that out of the total geographical area of the watershed, 25.78% of the watershed area has seen a change from one land use category to another, however rest 74.22% has remained unchanged. 相似文献
80.
Mapping vulnerability to multiple stressors: climate change and globalization in India 总被引:7,自引:0,他引:7
Karen OBrien Robin Leichenko Ulka Kelkar Henry Venema Guro Aandahl Heather Tompkins Akram Javed Suruchi Bhadwal Stephan Barg Lynn Nygaard Jennifer West 《Global Environmental Change》2004,14(4):627
There is growing recognition in the human dimensions research community that climate change impact studies must take into account the effects of other ongoing global changes. Yet there has been no systematic methodology to study climate change vulnerability in the context of multiple stressors. Using the example of Indian agriculture, this paper presents a methodology for investigating regional vulnerability to climate change in combination with other global stressors. This method, which relies on both vulnerability mapping and local-level case studies, may be used to assess differential vulnerability for any particular sector within a nation or region, and it can serve as a basis for targeting policy interventions. 相似文献