Infrasonic observations of chemical explosions

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Presentation transcript:

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

Swedish-Finnish Infrasound Network

Geographical coordinates of infrasound stations

Explosions:

Explosion site:

Directions and distances to the explosion site

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

Multifrequency measurements of the angle-of-arrival

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

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

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

Trace velocity for different frequencies, September 1, 2008

Source localization, September 1, 2008

Hilbert-Huang transform

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

IMF1 Hz UT, minutes

IMF2

IMF3

IMF4

The fine structure of IMF1

Angle-of-arrival derived from the IMF1 Jämtön Kiruna

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

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

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

Sound velocity

EW wind positive towards W

NS wind positive towards S

A possible propagation model

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

A possible propagation model

A possible propagation model