基于VFOM的礦山微震震源定位及近震震級標(biāo)定
[Abstract]:The source location and near magnitude of mine microseismic events are the most basic parameters of mine earthquakes, and their accurate calculation plays an important role in mine earthquake event analysis and information mining. This paper introduces a positioning method, virtual field optimization method (virtual field optimization method,VFOM), which is different from the traditional positioning method, and gives a regression method of near-earthquake magnitude formula aiming at minimum magnitude deviation of seismic station. VFOM and the regression method of near earthquake magnitude parameters are applied to the focal location of 401 microseismic events in Shaba mining area of Kaiyang Phosphate Mine and the recalibration of the near earthquake magnitude formula. The results show that the positioning results are reliable and the deviation of the magnitude station obtained from the recalibrated magnitude formula is obviously smaller than that of the existing formula. In addition, the magnitude distribution calculated by the formula of calibrating magnitude shows that the phenomenon of bimodal distribution is obvious, which indicates that the microseismic data of Shaba mine may be composed of two kinds of genetic events. Examples show that the calculation formula of near-earthquake magnitude in different regions must be recalibrated according to the measured data, otherwise, some important magnitude distribution characteristics may be lost.
【作者單位】: 中南大學(xué)資源與安全工程學(xué)院;中南大學(xué)深部金屬礦產(chǎn)開發(fā)與災(zāi)害控制湖南省重點(diǎn)實(shí)驗室;
【基金】:國家自然科學(xué)基金項目(41272304,11472311,51504288) 湖南省研究生科研創(chuàng)新項目(CX2015B052)
【分類號】:P315
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