Some Results from Studies of Regional Lithospheric Structure by Surface Waves

Abstract

Observations of digital seismological observatories, especially seismic arrays, provide unique opportunities for deriving regional lithospheric structure. This is achieved by using records of surface waves whose epicenter-station paths traverse regions of different tectonic structures. Reliable inference from these observations is facilitated by a high accuracy of raw data ensured by the great dynamic range of digital recording, large signal-to-noise ratios, the possibilities offered by modern methods of space-frequency-time analysis and computer polarization analysis. We are going to demonstrate some of the possibilities offer red by measurements of this type by analysing surface waves recorded at the NORSAR from a variety of seismic sources in Eurasia. Surface wave processing was mainly based on the two techniques described in Chapter 5 implemented as computer programs, namely, space-time and frequency-time analysis.