1-D
Shear wave velocities
by Microtremor Survey
- what is the
recommended way to seperate rayligh waves from other
seismic waves?
a
simple, two-dimensional slowness-frequency (p-f)
transform of a microtremor record can separate
Rayleigh waves from other seismic arrivals, and
allow recognition of true phase velocity against
apparent velocities.
- what is the
penetrated depth in regarding to the extension of
spread length?
since the total array length can vary from 300 ft
to 600 ft, the
maximum depth of resolution is about one-third to
one-half the length of the array which is equal to
100-200 ft.
-Why the equipment
includes vertical Geophone?
In order to record the P-wave.
-why the maximum
depth of resolution is about one-third to one-fifth
of the length of the array?
Because of Rayleigh criteria.
-what are the
essential factors that allow exploration equipment
to record surface-wave velocity dispersion, with a
minimum of field effort?
The use of a single geophone sensor at
each channel, rather than a geophone “group array”,
and the use of a linear spread of 12 or more
geophone sensor channels.
-what does the
ReMi processing involve?
1-
Velocity Spectral Analysis
2- Rayleigh Phase-Velocity Dispersion
Picking
3- Shear-Velocity Modeling