"1" .
"SDN:L05::155" .
"SDN:L05::155" .
.
.
"1" .
"false" .
"" .
.
.
.
"accepted"@en .
.
"SDN:L05::155" .
.
"seismic refraction systems"@en .
"2007-11-20 09:34:40.0" .
"2007-11-20 09:34:40.0" .
.
.
.
"A network of seismometers or geophones plus an energy source that determine geologic structure by detecting waves refracted by subsurface layers."@en .
.
.