Determination method of mine microseism source depth under latitude and longitude coordinates
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摘要: 针对经纬度坐标下矿山微震震源深度难以确定或误差较大的问题，提出了一种震源深度的测定方法。该方法在只利用微震P波走时的情况下，通过改进微震线性定位法计算微震震源的平面位置和发震时刻，然后通过震源到台站的震中距和微震走时，先进行TD模式拟合，在剔除错误数据后进行DT模式拟合，最后依据拟合直线的截距确定震源深度。实际应用结果表明，该方法能有效降低错误实测数据的干扰，提高震源深度的测定精度。Abstract: For problems of difficult determination and big error of mine microseism source depth, a determination method of microseism source depth was proposed by only using travel time of P wave. Firstly, plane coordinates and start time of microseism source are calculated through an improved linear location method. Secondly, based on epicentral distance and travel time of microseism between microseism source and station, TD mode fitting is conducted firstly and DT mode fitting is conducted after eliminating error data. Finally, microseism source depth is determined according to intercept of fitting straight line. The actual application results show that the method can effectively reduce interference of error measured data and improve measuring accuracy of microseism source depth.
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