... feedback defined by accurate means. Results show that rock joints can significantly affect the transmission and the attenuation of shock waves, and can therefore influence the stability of the adjacent underground structures. The spacing of joint set can also remarkably affect the propagation process...

... a brief theoretical description on ground vibrations sources with emphasis on rockfalls, while typical equations on the estimation of ground vibration amplitude and signal attenuation are also provided. Section 3 presents the experimental setup and the algorithm developed for rockfall event iden...

... in the elas- tic and visco-elastic rock moduli. In seismic data or 1357 full-waveform sonic logs the preferential loss of ampli- tude with frequency is referred to as apparent (or effec- tive) attenuation. This attenuation is the combination of intrinsic and scattering loss. Core-flooding experiments...

... Surveillance attenuation production monitoring France mechanism microphone acoustic monitoring production control Upstream Oil & Gas quarry SNR underground instability microphone 5 brasserie quarry Reservoir Characterization old limestone quarry propagation flow metering Paris detection...

... the most relevant factor for ground and structural damage, as well as for people nuisance. It is obvious that greater vibration intensities are associated with both the magnitude of released energies and to shorter distances from their sources, thus involving the role of ground attenuation...

..., the comparative data and correction factors, necessary in identification of rock massive behaviour at a great depths, have been acquired. structural geology attenuation anhydrite reservoir geomechanics absolute dilatancy threshold basalt great depth threshold elastic wave velocity Upstream Oil...

... masses, and they can greatly affect wave propagation and attenuation across jointed rock masses. Joints often contain liquid, and the presence of liquid will change the mechanical behaviors of the joint. The saturated joint can be modeled as nonwelded interfaces. Stresses across the joint are continuous...

... residual soils the Bombela Civils Joint Venture opted to include single-hole reflection borehole radar surveys as part of the ground investigation works. First arrival time, signal attenuation and reflectors were assessed from radargrams to locate karst structures and geological discontinuities...

... transmission equation propagation Reservoir Characterization attenuation shear stress ratIO fracture Upstream Oil & Gas single fracture hydraulic fracturing boundary normalized shear stiffness interface coefficient Coulomb slip model particle velocity incident wave UDEC...

... Upstream Oil & Gas seismic velocity geotomography geotomographic technique low velocity zone frequency attenuation joint frequency map geotomographic analysis joint frequency borehole amplitude seismic velocity rock mass initial velocity model Reservoir Characterization...

... 1993). Not only velocity but also attenuation is nowadays surveyed. Both parameters Ultrasonic waves are currently used as non destructive technique to evaluate the alteration state 41 seem to be correlated (Lockner et al. 1977, Best et al. 1994) but attenuation is more efficient to give an idea...

... Upstream Oil & Gas Wave Equation inversion derivative equation attenuation borehole algorithm rock engineering Crosswell Seismology Reservoir Characterization rvsp cw inverse technique inverse technique tunnel information requirement rock mass quantitative study...

... the Rasval Lake into the workings of mine No 1 of Sol-Iletsky soda-muriate deposit resulting in flooding the mine accompanied by karst formation which in 1984 absorbed fresh water from the lake located in the town. metals & mining attenuation Reservoir Characterization natural feature Upstream...

..., a design consists of estimating a design magnitude based on an empirical, site specific attenuation relationship defining the intensity of the ground motion anticipated at the site at some distance from the seismic source. Next, the damage caused by these dynamic influences has to be understood. From...