Seismic Studies of the Nevada Test Site
Quarterly technical rept. 1 Feb-31 May 1979
SIERRA GEOPHYSICS INC ARCADIA CA
Pagination or Media Count:
In this report, the following three areas are discussed 1 Geological and exploration geophysical data for the Yucca Flats area of NTS have been used to develop 3-dimensional models for studies of wave propagation in that basin. Amplitude and waveform complexity is examined for both incoming and outgoing seismic rays as a function of both azimuth and location across the basin. For the incoming case, the direct arrival is only minimally affected by changes in either azimuth or station location. 2 Through a deconvolution of teleseismic waveforms recorded at Climax Stock from the waveforms recorded at Yucca Flats an estimation of the receiver function for the sedimentary basin can be obtained. This receiver function is interpreted as a series of pulses that represent the timing, amplitude and polarity of multiple bounces within the sedimentary structure. For outgoing energy, the phase pP shares much of the same path traversed by the first multiple for incoming energy. Distortion of the phase pP and the addition of pulses representing energy that bounces within the basin will strongly modify the teleseismic waveforms and mb measurements. 3 This report is the second part of a continuing project to define both the teleseismic path averaged attenuation operator appropriate for sources located at NTS and the deviation from the average associated with distinct geologic structures.
- Test Facilities, Equipment and Methods
- Radiofrequency Wave Propagation