乌兰浩特地震台与阿尔山火山地震观测站面波震级偏差分析

Analysis of surface wave magnitude deviation between Ulanhotseismic station and Alshan volcanic earthquake observation station

为了提高乌兰浩特地震台、阿尔山火山地震观测站的震级精度,基于面波震级公式和残差统计方法,分别计算乌兰浩特台、阿尔山火山地震观测站与中国地震台网中心测定的面波震级之间的偏差,分析产生震级偏差的影响因素.结果表明:乌兰浩特台、阿尔山火山地震观测站测定的面波震级与中国地震台网发布震级的偏差平均值分别为0.19、0.17;震级偏差总体呈现随震级的增加而先增大后减少的趋势;阿尔山火山地震观测站震级偏差随震中距的增大而增大,而乌兰浩特台则先增大后减少.

In order to improve the magnitude accuracy of Ulanhot seismic station and Alshan volcanic earthquake observation station,the deviation between the surface wave magnitude measured by ulanhot seismic station,alshan volcanic earthquake observation station and China seismic network center was calculated based on the formula of surface wave magnitude and residual statistical method,and the influencing factors of the magnitude deviation were analyzed.The results showed that the average deviation between the surface wave magnitude measured by ulanhot station and alshan volcano earthquake observatory and the magnitude published by China earthquake networks was 0.19 and 0.17,respectively.On the whole,the magnitude deviation increases first and then decreases with the increase of magnitude.The magnitude deviation of alshan volcano earthquake observation station increased by the distance of epicenter,while ulanhot station increases first and then decreases.