refractor ambiguities are big problem in seismic refraction method especially in seismic engineering. there can be hidden subsurface geological phenomena such as hidden faults and shear zones which are not simply predicted by the travel-time graph or some geophysical methods. head wave amplitudes are used to show the resolution of refractor ambiguities and the existence of anisotropy in complex...

asymptotically exact and nonlocal third order nonlinear evolution equations are derivedfor two counterpropagating surface capillary gravity wave packets in deep water in thepresence of wind flowing over water.from these evolution equations stability analysis ismade for a uniform standing surface capillary gravity wave trains for longitudinal perturbation. instability condition is obtained and g...

In this article, a novel design of piezoelectric dipole transducer is proposed for formation acoustic velocity measurement in the vicinity borehole with frequency range 0.4–6 kHz. The which actuates cylindrical shell to generate pure mode wave by using multiple bender bars analyzed theoretically and simulated numerically finite element method (FEM). Moreover, fabricated tested compare numerical...

iran is situated in one of the world's seismic regions and the possibility of destructive earthquakes in most regions of the country has given great significance to recognition of iranian seismic nature from a seismic and seismotectonic standpoint. study of the crust and upper mantle velocity structure in the iranian plateau provides better understanding of its evolution and tectonic histo...

Dense hydrous magnesium silicate (DHMS) phase E is a potential water carrier in subducting slabs that can transport to the Earth's deep mantle between bottom of upper and uppermost transition zone. Therefore, knowledge on high pressure‒temperature (P‒T) full elastic moduli at relevant conditions important deciphering existence DHMS phases their influences seismic profiles region; however, P‒T e...

The composition of the crust is one most uncertain and controversial components continental estimates due to (1) limited direct access (2) inconsistent indirect assessments. Here we show that by combining high-resolution shear velocity (Vs) models with newly measured ratio compressional wave (Vp) Vs, or Vp/Vs ratio, for crystalline crust, a 3-D (SiO2 wt%) model can be derived uncertainty estima...

Abstract Thermal properties of rocks are great importance not only for geothermal projects. The focus petrophysical data presented here is laid mainly on volcanic rocks. include thermal conductivity but also heat production and capacity. A full range dataset analysis out it here. target this study to deliver new insights in the Austria. conductivity—understanding influencing factors correlation...

Asymptotically exact and nonlocal fourth order nonlinear evolution equations are derived for two coupled fourth order nonlinear evolution equations have been derived in deep water for two capillary-gravity wave packets propagating in the same direction in the presence of wind flowing over water.We have used a general method, based on Zakharov integral equation.On the basis of these evolution eq...