Discriminating between explosions and earthquakes

作者：Cho Kwang Hyun^*

来源：Applied Geophysics, 2014, 11(4): 429-436.

DOI：10.1007/s11770-014-0450-4

• explosion
• earthquake
• nuclear test
• P wave
• Rg wave
• numerical modeling

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 degrees N, 125.383 degrees E) and October 30, 2001 (38.748 degrees N, 125.267 degrees E), a nuclear test on October 9, 2006 (41.275 degrees N, 129.095 degrees E), and two earthquakes on April 14, 2002 (39.207 degrees N, 125.686 degrees E) and June 7, 2002 (38.703 degrees N, 125.638 degrees 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.

• 出版日期2014-12