نتایج جستجو برای: asthenosphere boundary (lab) and average crustal density.there are methods

تعداد نتایج: 17112150  

Journal: :فیزیک زمین و فضا 0
سید هانی متولی عنبران استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران وحید ابراهیم زاده اردستانی استاد، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران هرمان زین استاد، دانشکدة علوم زمین، دانشگاه پاریس، فرانسه

the targeted area of this research includes e anatoly, nw zagros, and caucasus. these structures are known as a complex and active area and in the early stage of continent-continent collision, which give us unique possibility to monitor such collision in real time. therefore, it is very important to study this active area to have a better knowledge about its tectonic behavior and lithospheric s...

2010
David L. Abt Karen M. Fischer Scott W. French Heather A. Ford Huaiyu Yuan Barbara Romanowicz

[1] Sp and Ps converted seismic waves at 93 permanent seismic stations are used to image upper mantle velocity discontinuities across the contiguous United States and portions of southeast Canada and northwest Mexico. Receiver functions are calculated with frequency‐ domain deconvolution and migrated with 1D models that account for variations in crustal structure and mantle velocities between s...

Journal: :فیزیک زمین و فضا 0
فتانه تقی زاده فرهمند دانشکده علوم دانشگاه آزاد اسلامی واحد قم- استادیار فروغ صدودی مؤسسه تحقیقاتی علوم زمین هلمهولتز، پتسدام- پژوهشگر محمدرضا قیطانچی مؤسسه ژئوفیزیک دانشگاه تهران، استاد نرگس افسری دانشگاه آزاد اسلامی واحد اسلام شهر- دانشجوی دکتری

recently, the s receiver function method has been successfully developed to identify upper mantle interfaces. s receiver functions have the advantage of being free of s-wave multiple reflections and can be more suitable than p receiver function for studying mantle lithosphere. however, because of specific ray geometry of the s-to-p converted waves, the s receiver function method has some techni...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم اجتماعی و اقتصادی 1389

abstract nowadays, the science of decision making has been paid to more attention due to the complexity of the problems of suppliers selection. as known, one of the efficient tools in economic and human resources development is the extension of communication networks in developing countries. so, the proper selection of suppliers of tc equipments is of concern very much. in this study, a ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده مهندسی برق و کامپیوتر 1391

power transformers are important equipments in power systems. thus there is a large number of researches devoted of power transformers. however, there is still a demand for future investigations, especially in the field of diagnosis of transformer failures. in order to fulfill the demand, the first part reports a study case in which four main types of failures on the active part are investigate...

2001
Shijie Zhong Maria T. Zuber

The surface of Mars consists of an old, heavily cratered and elevated southern hemisphere and younger, resurfaced and depressed northern hemisphere, a feature often termed the crustal dichotomy. The global crustal structure [Zuber et al., 2000] revealed by topography and gravity data from the Mars Global Surveyor spacecraft, and the possible late formation of the boundary zone between the hemis...

Journal: :Geophysical Research Letters 2022

We use two-plane-wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure crust and upper mantle. Our model is used estimate crustal thickness depth lithosphere-asthenosphere boundary (LAB) beneath region. Calculated ranges between 25 55 km suggests extension in NW-SE direction, presumably due back-arc processes associate...

Journal: :Science 2009
Hitoshi Kawakatsu Prakash Kumar Yasuko Takei Masanao Shinohara Toshihiko Kanazawa Eiichiro Araki Kiyoshi Suyehiro

The mobility of the lithosphere over a weaker asthenosphere constitutes the essential element of plate tectonics, and thus the understanding of the processes at the lithosphere-asthenosphere boundary (LAB) is fundamental to understand how our planet works. It is especially so for oceanic plates because their relatively simple creation and evolution should enable easy elucidation of the LAB. Dat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه 1377

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

2007
Toshinori Sato

We developed a kinematic earthquake cycle model applicable to transform fault zones, subduction zones, and collision zones on the basis of elastic dislocation theory. The crustal deformation associated with the periodic occurrence of interplate earthquakes is generally given by the superposition of viscoelastic responses to steady slip on the whole plate boundary, steady back slip on the seismi...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید