用河北张家口台速度与位移记录测定近震震级的对比

Comparison and Discussion about Determining Local Magnitude with Displacement and Velocity Records of Zhangjiakou Seismological Station

对河北张家口台FBS-3宽频带大动态范围的数字化速度地震仪和DD-2短周期模拟位移地震仪所记录的河北张北地区的地震,利用速度和位移数据分别测定了近震震级并进行了对比分析。结果显示,在一定的震级范围内,这两种资料测定的震级基本一致,没有发现二者之间存在系统误差,标准误差也较小。可以认为,无论从其物理意义还是具体做法上,用速度测定的震级与由位移测定的震级之间能够保持较好的一致性和连续性。

In this paper, the magnitudes of local earthquakes in Zhangbei, determined by velocity data by using record of FBS-3 broadband and wide dynamic digital velocity seismograph, are compared with those determined by displacement data by using DD-2 short period analog displacement seismograph . The results show that the magnitudes obtained by using these two kinds of data are marginally different within a certain range and both the systematic and standard deviations are small. It concludes that there are good consistency and seriality between the magnitudes from velocity data and ones from displacement data, no matter in physics and practices.