Full Waveform Inversion for Structure and Source Parameters Using Regional Data Recorded in Eastern Kazakhstan
Abstract
We have completed a study which was aimed at obtaining fundamental understanding of regional wave propagation by attempting to match synthetic seismograms with real data. The first part of this study involved the identification and analysis of a set of local and regional seismic events recorded near the former Soviet test site at Semipalatinsk. We then applied full waveform inversion in the 0.5 to 1 Hertz frequency band to selected events to extract source and structure parameters. We found that for certain source- receiver paths we could do an excellent job of matching complete seismograms on radial and vertical components up to a frequency of one Hertz including P, S and Rg phases using shallow explosion sources. For other source-receiver paths the fits were not so good using shallow explosion sources, however we obtained good fits on all three components by assuming a 5 km deep earth source. These results indicate that waveform inversion can be used to discriminate small shallow explosions from small relatively shallow earthquakes and that structural effects can be accurately modeled in this region up to a frequency of 1 Hertz.... Regional events, Source discrimination, Waveform inversion, Waveform modeling
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1993
- Accession Number
- ADA266405
Entities
People
- Danny J. Harvey
Organizations
- University of Colorado Boulder