Continental Rayleigh Wave Dispersion and the Estimation of Chirpfilter Detectors
Abstract
Rayleigh wave data were recorded by a single vertical high-gain seismograph located in north Texas. It was found that Rayleigh waves propagating in a continental path over the pole to this station exhibited very stable dispersion characteristics, particularly in the period range 35-75 secs: at shorter periods an average dispersion curve could be estimated. A composite dispersion curve was used to develop 'chirp' (or matched) filters, the form of which depended on the distance between the seismograph and the event. Such filters are shown to be very efficient in improving the signal-to-noise ratio of Rayleigh waves emanating from events in the Sino-Soviet region and can be used as a means of separating 'mixed' Rayleigh waves. For the path over the pole (or 'polar waveguide') the detection threshold is estimated to be at M(s)=3.5.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1973
- Accession Number
- AD0761795
Entities
People
- Eugene T. Herrin
- John A. Mcdonald
- William Tucker
Organizations
- Southern Methodist University