COMPLEXITY AND SPECTRAL RATIO OF EARTHQUAKES AND NUCLEAR EXPLOSIONS IN CHINA
M.M.F SHOKRY; S. ELKHOLY;
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.
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.
Other data
| Title | COMPLEXITY AND SPECTRAL RATIO OF EARTHQUAKES AND NUCLEAR EXPLOSIONS IN CHINA | Authors | M.M.F SHOKRY ; S. ELKHOLY | Issue Date | 2018 | Publisher | Egyptian Geophysical Society | Journal | EGS Journal | Series/Report no. | ;EGS Journal, Vol. 16, No. 1, 171-177 (2018) | Description | فى إطار معاهدة الحظر الشامل للتجارب النوویة یعتبر التمییز بین الزلازل الطبیعیة والتفجیرات النوویة من الأمور الهامة. هناك طرق عدیدة للتمییز بین الزلازل الطبیعیة والتفجیرات النوویة منها النسب الطیفیة للأحداث ومدى تعقیدها. تعتبر الصین من المناطق الأكثر نشاطا على المستوى التكتونى خاصة فى الجزء الغربى وهى أیضا نشطة زلزالیا فى الجزء الشمالى. یهدف هذا البحث إلى التمییز بین الزلازل الطبیعیة والتفجیرات النوویة لمنطقة الصین باستخدام عدة طرق منها النسب الطیفیة للأحداث ومدى تغییرها لعدد سبعة زلازل وسبعة تفجیرات شدتهم تتراوح ما بین ٤,٥ إلى ٦,٥ بمقیاس ریختر. وأظهرت النتائج أن مقدار تعقید الزلازل أكبر بكثیر من التفجیرات النوویة على المسافات البعیدة، وبالتالى التمییز ما بین الزلازل والتفجیرات النوویة تكون أكثر وضوحا. وعلى العكس قد تبین أن النسب الطیفیة للتفجیرات النوویة أكبر من النسب الطیفیة للزلازل، حیث أن موجات التفجیرات النوویة لها محتوى ترددى أعلى من الزلازل. |
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