scholarly journals Shear Wave Velocity data Survey and Estimation of Necessary Depth for Dynamical Analysis of Deposit Effect in Mashhad

2016 ◽  
Vol 9 (4) ◽  
pp. 3207-3226
Author(s):  
R. Yazdanfar ◽  
N. Hafezi Moghadas ◽  
H Sadeghi ◽  
MR Ghayamghamian ◽  
◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Dynamical Analysis ◽  
Velocity Data ◽  
Data Survey

scholarly journals Development of site class and site coefficient maps of Semarang, Indonesia using field shear wave velocity data

2017 ◽  
Vol 101 ◽  
pp. 05010 ◽  
Author(s):  
Windu Partono ◽  
Masyhur Irsyam ◽  
Sri Prabandiyani Retno Wardani
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Data ◽  
Site Class

SHEAR‐WAVE VELOCITY VERSUS DEPTH IN MARINE SEDIMENTS: A REVIEW

Geophysics ◽  
1976 ◽  
Vol 41 (5) ◽  
pp. 985-996 ◽  
Author(s):  
Edwin L. Hamilton
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Marine Sediments ◽  
Shear Wave Velocity ◽  
Shear Waves ◽  
Shear Velocity ◽  
Velocity Versus ◽  
Velocity Data ◽  
Velocity Gradients

The objectives of this paper are to review and study selected measurements of the velocity of shear waves at various depths in some principal types of unlithified, water‐saturated sediments, and to discuss probable variations of shear velocity as a function of pressure and depth in the sea floor. Because of the lack of data for the full range of marine sediments, data from measurements on land were used, and the study was confined to the two “end‐member” sediment types (sand and silt‐clays) and turbidites. The shear velocity data in sands included 29 selected in‐situ measurements at depths to 12 m. The regression equation for these data is: [Formula: see text], where [Formula: see text] is shear‐wave velocity in m/sec, and D is depth in meters. The data from field and laboratory studies indicate that shear‐wave velocity is proportional to the 1/3 to 1/6 power of pressure or depth in sands; that the 1/6 power is not reached until very high pressures are applied; and that in most sand bodies the velocity of shear waves is proportional to the 3/10 to 1/4 power of depth or pressure. The use of a depth exponent of 0.25 is recommended for prediction of shear velocity versus depth in sands. The shear velocity data in silt‐clays and turbidites include 47 selected in‐situ measurements at depths to 650 m. Three linear equations are used to characterize the data. The equation for the 0 to 40 m interval [Formula: see text] indicates the gradient [Formula: see text] to be 4 to 5 times greater than is the compressional velocity gradient in this interval in comparable sediments. At deeper depths, shear velocity gradients are [Formula: see text] from 40 to 120 m, and [Formula: see text] from 120 to 650 m. These deeper gradients are comparable to those of compressional wave velocities. These shear velocity gradients can be used as a basis for predicting shear velocity versus depth.

Application of Piezoelectric Film to Measure the Shear Wave Velocity

2013 ◽  
Vol 418 ◽  
pp. 161-164
Author(s):  
Keeratikan Piriyakul
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
New Technique ◽  
Clay Material ◽  
Piezoelectric Film ◽  
Velocity Data ◽  
Sensitive Sensor ◽  
A New Technique ◽  
Good Agreement

This paper purposes a new technique to measure the shear wave velocity by using the piezoelectric film. This piezoelectric film is a very thin, light and high sensitive sensor and is used as a receiving sensor. The details of this new technique and its interpretations on Bangkok clay material are explained. The research found that this new technique is a reasonable technique, giving the shear wave velocity result in good agreement with the shear wave velocity data from the field test.

scholarly journals Multichannel analysis of the surface waves of earth materials in some parts of Lagos State, Nigeria

2016 ◽  
Vol 63 (2) ◽  
pp. 81-90
Author(s):  
R.B. Adegbola ◽  
K.F. Oyedele ◽  
L. Adeoti ◽  
A.B. Adeloye
Keyword(s):  
Surface Waves ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Data ◽  
Low Velocity ◽  
Borehole Data ◽  
Shear Wave Velocities ◽  
Multichannel Analysis ◽  
Rigidity Modulus

Abstract We present a method that utilizes multichannel analysis of surface waves (MASW), which was used to measure shear wave velocities, with a view to establishing the probable causes of road failure, subsidence and weakening of structures in some local government areas in Lagos, Nigeria. MASW data were acquired using a 24-channel seismograph. The acquired data were processed and transformed into a two-dimensional (2-D) structure reflective of the depth and surface wave velocity distribution within a depth of 0–15 m beneath the surface using SURFSEIS software. The shear wave velocity data were compared with other geophysical/ borehole data that were acquired along the same profile. The comparison and correlation illustrate the accuracy and consistency of MASW-derived shear wave velocity profiles. Rigidity modulus and N-value were also generated. The study showed that the low velocity/ very low velocity data are reflective of organic clay/ peat materials and thus likely responsible for the failure, subsidence and weakening of structures within the study areas.

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