1. Infrasonic observations of chemical explosions
Ludwik Liszka
Swedish Institute of Space Physics

2. Swedish-Finnish Infrasound Network

3. Geographical coordinates of infrasound stations

4. Explosions:

5. Explosion site:

6. Directions and distances to the explosion site

8. Scalograms of typical signals at both stations, August 22, 2008
Kiruna
Jämtön

9. Multifrequency measurements of the angle-of-arrival

10. Angle-of-arrival as a function of frequency, August 22, 2008
Kiruna
Jämtön

11. Angle-of-arrival and trace velocity of the broad-band signal, September 1, 2008

12. Angle-of-arrival for different frequencies, September 1, 2008

13. Trace velocity for different frequencies, September 1, 2008

14. Source localization, September 1, 2008

15. Hilbert-Huang transform

16. First four IMF:s on Sep 1, 2008
IMF1
IMF3
8 Hz
UT, minutes
IMF4
IMF2

17. IMF1 Hz
UT, minutes

18. IMF2

19. IMF3

20. IMF4

21. The fine structure of IMF1

22. Angle-of-arrival derived from the IMF1
Jämtön
Kiruna

23. Source localization, September 1, 2008
Source localization, September 1, Comparison with localization using the HHT IMF1

24. Standard deviations of derived latitude and longitude as a function of day no., Aug 13 – Sep 11,2008

25. Sodankylä radiosonde data Aug 13 – Sep 11,2008
EW wind
NS wind
Sound velocity

26. Sound velocity

27. EW wind positive towards W

28. NS wind positive towards S

29. A possible propagation model

30. Scalograms of typical signals at both stations, August 22, 2008
Kiruna
Jämtön

31. A possible propagation model

32. A possible propagation model