نتایج جستجو برای: transition zone

تعداد نتایج: 366947  

Journal: :فیزیک زمین و فضا 0
سمیه کلانه کارشناس ارشد تکتونیک، دانشکدة علوم، دانشگاه گلستان، گرگان، ایران مریم آق اتابای استادیار گروه زمین شناسی، دانشکدة علوم، دانشگاه گلستان، گرگان، ایران

earthquakes are a particular concern because of the serious hazard they present. the existence of seismicity patterns such as the foreshock and aftershock clusters, doughnut pattern, seismic quiescence etc show that the earthquake occurrence in the active tectonic regions is not random and clustering phenomena are obvious characteristics of these events in space and time. fractal analysis, as a...

زرین کوب, محمدحسین1, نخعی, ملیحه, بیانی, ریحانه , محمدی, سید سعید , چانگ, سون لین ,

Tertiary volcanic rocks including andesite, trachydacite and rhyodacite with pyroclastic rocks cropped out in east of Sarbisheh at Southern Khorasan.  The main minerals in andesites are plagioclase, pyroxene, amphibole and biotite and for acidic rocks include plagioclase, quartz, sanidine, amphibole and biotite. On the basis of microprobe analyses, the composition of plagioclases in andesites r...

1985
E. Kalbus

Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for the journal Hydrology and Earth System Sciences Abstract Interactions between groundwater and surface water play a critical role in the functioning of riparian ecosystems. In the context of sustainable river basin management it is crucial to understand and quantify exchange processes between gro...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم 1395

چکیده: در این پژوهش سازند گورپی در برش تاقدیس کوه سیاه در شمال شهرستان دهدشت ( یاسوج، زاگرس) به منظور مطالعات چینه نگاری زیستی و چینه نگاری سکانسی مورد بررسی قرار گرفت. سازند گورپی در برش مورد نظر به طور پیوسته بر روی سازند ایلام قرار گرفته است و مرز بالایی آن با سازند پابده به طور ناپیوسته و هم شیب دیده می شود. نهشته های سازند گورپی در برش تاقدیس کوه سیاه 212 متر ضخامت داشته و شامل 13 واحد س...

Journal: :Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2014
Yannicke Dauphin Jean-Pierre Cuif Hiram Castillo-Michel Corinne Chevallard Bastien Farre Anders Meibom

Species of Haliotis (abalone) show high variety in structure and mineralogy of the shell. One of the European species (Haliotis tuberculata) in particular has an unusual shell structure in which calcite and aragonite coexist at a microscale with small patches of aragonite embedded in larger calcitic zones. A detailed examination of the boundary between calcite and aragonite using analytical mic...

2007
Mark H. Murray Michael Lisowski

We combine triangulation, trilateration, and GPS observations to determine horizontal strain rates along the Cascadia subduction zone from Cape Mendocino to the Strait of Juan de Fuca. Shear-strain rates are significantly greater than zero (95% confidence) in all forearc regions (26-167 nanoradians/yr), and are not significant in the arc and backarc regions. The deformation is primarily uniaxia...

Journal: :فیزیک زمین و فضا 0
محمدرضا حاتمی مؤسسه ژئوفیزیک دانشگاه تهران، استادیار ظاهر حسین شمالی مؤسسه ژئوفیزیک دانشگاه تهران، استادیار غلام جوان دولویی پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، استادیار

the source parameters and focal depth of the destructive mw 6.5, 31 march. 2006 iran- silakhor earthquake, the two largest foreshocks and a major aftershock are determined using broadband data from a seismic network in iran based on a time-domain linear moment tensor inversion. the earthquakes occurred in the zagros suture zone in western iran. waveform inversion of the selected events estimate...

2012
B EXINTARIS B CHAKRABARTY A DEY M LAM M FRYDENBERG N LAWRENTSCHUK

Introduction: All men show characteristics of benign prostatic hyperplasia (BPH) upon aging; it is the most common benign neoplasm in men. When the prostate is enlarged it causes a narrowing of the urethra leading to bladder outlet obstruction and reduced urine flow. The symptoms vary and include nocturia, incomplete emptying, urinary hesitance, weak stream, urgency and frequency to the develop...

2017
C. Joffrin J. P. Benoit R. Currat M. Lambert Benoit

2014 An inelastic neutron scattering study of the ferroelastic phase transition in lead phosphate has revealed in the high temperature phase the existence of a zone boundary soft mode whose character is compatible with the structure change at the transition. The analysis of the observed spectral line shape shows that this soft mode is overdamped between Tc and Tc + 100 K. The quasiharmonic freq...

Journal: :Acta crystallographica. Section B, Structural science 2011
Maxime A Siegler Sean Parkin Ross J Angel Carolyn Pratt Brock

The transition between 190 and 200 K in [Ni(H(2)O)(6)](NO(3))(2)·(15-crown-5)·H(2)O has been followed by determining the structure at 22 temperatures in the range 90-273 K. The structural change is a zone-boundary transition with a critical point at (½, 0, ½) in the Brillouin zone of the high-temperature phase; both phases have space-group symmetry P2(1) but the volume of the unit cell is halve...

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