Source time-function as discriminant using empirical Greens function

The source mechanism of underground nuclear explosions is remarkably different from that of earthquakes in both spatial radiation pattern and source time-function (STF). Small underground nuclear explosions can be used as empirical Green's functions (EGF) to isolate the source-time spectrum of a large suspected earthquake occurred in a Nuclear Test Site (target area) by the spectral division method. As this study shows, with high-quality data, the quotient spectrum can be transformed to the time domain, yielding the apparent far-field source-time function of the large suspected event. The relative source time-function (RSTF) of a nuclear explosion is usually a simple pulse with a duration of about 1 s., while an earthquake's is more complicated with a series of pulses and a longer duration. The RSTF can be used as a nice discriminant to distinguish the nature earthquakes from underground nuclear explosions in target areas.

作 者： HE Yongfeng CHEN Xiaofei   作者單位： HE Yongfeng(Department of Geophysics, School of Earth & Space Sciences, Peking University, Beijing 100871, China;North-West Institute of Nuclear Technology, Xi'an 710024, China)

CHEN Xiaofei(Department of Geophysics, School of Earth & Space Sciences, Peking University, Beijing 100871, China) 

刊 名： 中國科學D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES)  年，卷(期)： 2005 48(12)  分類號： P5  關鍵詞： target-area   empirical Green's function   RSTF