By Charles G. Sammis, Thomas L. Henyey
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Extra info for Geophysics: Field Measurements
Lob), the right-hand side of Eq. (24) has an additional term - CB to account for the elastic restoring force, with C ( > O ) being the equivalent spring constant. The natural frequency for the spring-coupled pendulum is 01 = 27rfi = Jg/Io + C/jl (28) 10. 1 1 . (a) Garden gate suspension of a horizontal pendulum. (b) Modification of the garden gate suspension resulting in tensional hinge points. ( c ) Period lengthening of a garden gate suspension. Therefore, a spring-coupled pendulum will result with an increased natural frequency or reduced pendulum period.
The LASA array is intended to be operated similarly to a radio telescope array, except that it points downward and uses seismic waves. The timing of wave signals arriving at all array elements is crucial in its operation ; therefore, seismic date telemetry becomes a necessity. Other arrays established shortly after LASA are the Eskdalemuir Array in Scotland, the Yellow Knife Array in Canada, the Gauribidanur Array in India, the Warramunga Array in Australia, the NORSA Array in Norway, and the Hagfor Array in Finland, all for the purpose of defection and discrimination of nuclear explosions.
1986). 4. 1. Drum Recorders. These devices were introduced before the turn of this century. A sheet of paper usually 30 x 90cm is wrapped around a cylinder about 15 cm in diameter. 5-5 mm/min). The seismic record is thus written by a pen in the form of a helical curve over the cylindrical drum surface. In this manner, 1 day of seismic record can be written on one sheet of paper. By reducing the rotation speed and rate of translation, several days of record can be accommodated on the same sheet of paper at reduced resolution.
Geophysics: Field Measurements by Charles G. Sammis, Thomas L. Henyey