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Discriminating between explosions and earthquakes
Pages: 429-436+509-510
Year: Issue:  4
Journal: Applied Geophysics

Keyword:  explosionearthquakenuclear testP waveRg wavenumerical modeling;
Abstract: Earthquake, explosion, and a nuclear test data are compared with forward modeling and band-pass filtered surface wave amplitude data for exploring methodologies to improve earthquake–explosion discrimination. The proposed discrimination method is based on the solutions of a double integral transformation in the wavenumber and frequency domains. Recorded explosion data on June 26, 2001(39.212°N, 125.383°E) and October 30, 2001(38.748°N, 125.267°E), a nuclear test on October 9, 2006(41.275°N, 129.095°E), and two earthquakes on April 14, 2002(39.207°N, 125.686°E) and June 7, 2002(38.703°N, 125.638°E), all in North Korea, are used to discriminate between explosions and earthquakes by seismic wave analysis and numerical modeling. The explosion signal is characterized by first P waves with higher energy than that of S waves. Rg waves are clearly dominant at 0.05–0.5 Hz in the explosion data but not in the earthquake data. This feature is attributed to the dominant P waves in the explosion and their coupling with the SH components.
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