Application of the Phase-Difference Polarization Filter to Short-Period Regional Data
Abstract
The purpose of this work is to optimize the phase-difference polarization filter for use in extracting short-period regional data from seismic noise and signal coda. The phases to be extracted are the body waves Pn, Pg, Sn, and Sg, and the surface waves Lg and Rg. The data available for this work were from events with epicenters in northeastern China, and in Honshu and Hokkaido, Japan. The data used were recorded at the three-component short-period site of the Korean Seismic Research Station (KSRS). The polarizations filter yields signal-to-noise ratio gains to approximately 10 dB for regional compressional and shear waves (Pn, Pg, Sn, and Sg) and of approximately 8 dB for regional surface waves (Lg and Rg). Direct estimates of the detection capability for regional P and S (delta = 10 deg to 13 deg) made before and after polarization filtering show that the polarization filter yields detection improvements of approximately 0.6 m(b) units for these phases. Finally, the polarization filter can be used to separate mixed signals, to identify phases, and to extract regional phases from seismic noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 16, 1979
- Accession Number
- ADA082312
Entities
People
- Alan C. Strauss