COMPLEXITY AND SPECTRAL RATIO OF EARTHQUAKES AND NUCLEAR EXPLOSIONS IN CHINA | ||
| Journal of Egyptian Geophysical Society | ||
| Volume 16, Issue 1, 2018, Pages 171-177 PDF (857.19 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jegs.2018.385806 | ||
| Authors | ||
| M.M.F SHOKRY1; S. ELKHOLY2 | ||
| 1(1) Geophysics Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt. | ||
| 2(2) National Research Institute of Astronomy and Geophysics, Helwan (NRIAG), 11722, Cairo, Egypt. | ||
| Abstract | ||
| The discrimination between nuclear explosions and earthquakes is an important issue for the verification of compliance with a Comprehensive Test Ban Treaty (CTBT). Several diagnostic techniques are examined for identifying earthquakes as events distinct from possible underground nuclear explosions such as complexity and spectral ratio. China is a tectonically and seismically complicated region, especially in the western part. Seismicity is active in North China. The objective of this paper is discriminating the nuclear explosions from natural earthquakes in China region by using the complexity and spectral ratio tools for a set of seven nuclear explosions and seven earthquakes with 4.5 ≤ mb ≤ 6.5. It was found that, the complexity of natural events (earthquakes) is higher than of artificial events (explosions), therefore, natural earthquakes are more complex than nuclear explosions at teleseismic distances and separation is clear between both of them. On the other hand, the spectral ratio is larger for explosions than for earthquakes due to the seismogram of explosions have higher frequency content than that for earthquakes. | ||
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