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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Infrasound associated with the deep M 7.3 northeastern China earthquake of June 28, 2002

Fig. 1

(a) Acoustic (upper) and seismic (lower) waveforms recorded at CHNAR. A spectrogram of acoustic data (CHN03) is plotted under the waveform. Gray boxes indicate dominant infrasound arrivals, and local and epicentral secondary-source infrasound. (b) Results of progressive multi-channel correlation calculations on the infrasonic recordings in terms of azimuth and apparent velocities in the frequency range of 0.1–3.0 Hz. Sequential and discrete detection results are marked by boxes labeled S1–S4, respectively.

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