1. Systems Check

2. Milton Garces and Claus Hetzer Infrasound Laboratory, University of Hawaii, Manoa PMCC analyses of signals from the North American and Pacific Infrasound Network 2003 Infrasound Technology Workshop, San Diego, California

3. Outline Apply Progressive Multiple Channel Correlation (PMCC) detector to various events and array geometries Bolides, microbaroms, aircraft, surf, volcanoes, and Columbia reentry for small aperture and large aperture arrays

4. PMCC: Consistency Define consistency threshold Can also define correlation filter Select different frequency bands Provides detailed frequency information Can add F-stat for further screening Consistency is based on closure relationship for plane waves arriving on elements i,j,k:  t ij +  t jk +  t ki = 0 April 23, 2001

5. Automatic processing at IS59: Operations

6. Automatic processing at IS59 Microbaroms 14415 arrivals, Jan 1- Oct 24 Max consistency for im (0.1-0.5 Hz): 0.5 s

7. Microbaroms: blocking by topography

8. Portable Stations Airport and coastline (19.7421 N, 156.05221 W)

9. Portable Station: Keahole Point Airport and coastline

10. Surf High Surf: Arrivals

11. Surf High Surf: Arrivals

12. Surf High Surf: Acoustic amplitude

13. Surf

14. Volcano infrasound Sound timbre is determined by gas and/or lava composition, temperature, and speed, as well as by structure of conduit Cookie Monster, Hawaii Kuju, Japan

15. Volcano infrasound

16. Kilauea volcano: discovered continuous infrasonic vibration

17. Detector response to different array sites and configurations Columbia reentry STS-107 Looked at 30s and 5s windows

18. STS-107 at NVIAR N-wave and later arrivals corresponding to approach

19. STS-107 at TXIAR No N-wave, multiple pulses from multipathing

20. STS-107 at SGAR Backazimuth points south of trajectory: February 1, 2003

21. Shuttle reentries with orbital declination of 39 o

22. STS-78 at SGAR N-wave, approach, and departure July 7, 1996 – Summer!

23. Concluding Remarks PMCC detector can be optimized to find particular signal features Detector handles well different array geometries Yearly microbarom detections highlight shadow zones from topography and possible phase inconsistencies between Chaparral sensors Portable stations permit better source location and characterization STS-107 Columbia reentry over Western US detected by most of the N American Infrasound Network Tuned detector to search for relatively brief coherent bursts corresponding to the approach trajectory Infrasound from STS-107 does not appear to be much different from other Shuttle reentries with a similar orbital inclination Infrasonic studies are consistent with NASA’s interpretation