RSTN receiver structure study: final results

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6042195

Owens, T J

A site structure study of all RSTN stations has been completed by Lawrence Livermore National Laboratory. This study was undertaken in order to develop improved techniques for evaluating local crustal structure beneath isolated seismic stations such as the RSTN and to provide a basis for evaluating the siting procedures used on RSTN stations. We utilize a large number of teleseismic P-waveforms recorded in the midperiod RSTN passband. Our teleseismic waveform modeling technique involves inverting the radial component of stacked, source-equalized receiver functions in the time domain to estimate the vertical shear velocity structure at the site. This paper summarizes our results at RSNY, RSON, and RSNT and reviews our results at RSCP and RSSD. The receiver functions at RSNY, RSON, and RSNT are quite simple compared to previously published RSCP data, largely due to the absence of sedimentary surface rocks at these sites. At RSNY, a high-velocity layer at mid-crustal depths (18 to 26 km) in our SE back azimuth results correlates in depth with a zone of high-amplitude reflections found on COCORP profiles 60 km south of RSNY. The RSON and RSNT sites are characterized by simple crusts. The crust beneath RSON appears to have a clear division between the upper and lower crust at about 18 km depth while this boundary is not well developed at RSNT. The crustal thicknesses at each of these sites are: RSNY, 45 to 50 km; RSNT, 38 km; RSON, 42 km. Important variations in the structure of the crust-mantle boundary at these sites are also indicated by our analysis. 15 refs., 16 figs., 11 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6042195
• Report Number(s): UCID-20649; ON: DE86007250
• Country of Publication: United States
• Language: English

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