Expanding Coherent Array Processing to Larger Apertures Using Empirical Matched Field Processing
Abstract
The objectives of this project are: (1) To investigate the limits of empirical matched field processing and other coherent array detection and parameter estimation methods as receiver aperture size increases from a few kilometers to many hundreds of kilometers. (2) To investigate techniques for extending the geographical source-region footprint over which empirical matched field processing and other coherent calibrated methods apply. Under a previous contract, we demonstrated the ability of empirical matched field processing to classify mining explosions by originating mine, using data from a single small-aperture array (ARCES) applied to mining events on the Kola Peninsula. In the current contract, we have chosen central Asia as our study region to assure programmatic relevance and to exploit the large belts of natural and man-made seismicity required for a test of our processing strategy. Data from suitable networks available for the study are from the four Kazakhstan arrays (MKAR, KKAR, ABKAR, BRVK) and the Kyrgyzstan network. Our overall approach will be to start with small apertures (the individual Kazakhstan arrays considered separately) to check the reproducibility of results we obtained for the European Arctic, then to extend the processing strategy first to a medium aperture (the Kyrgyzstan network; 200 km aperture) and then a large aperture (the four Kazakhstan arrays considered as a single coherent aperture; >1000 km). Simultaneously we will investigate methods to expand the source region footprint over which calibrations for coherent methods apply.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2008
- Accession Number
- ADA487591
Entities
People
- David B. Harris
- Frode Ringdal
- Steven J. Gibbons
- Tormod Kvaerna
Organizations
- NORSAR