Abstract:Based on the seismic records of Jiangsu strong motion network and Jiangsu seismic network, using the method of real-time simulation of WA records in time domain we carry out ML determination of earthquakes with M≥2.3 recorded from 2007 to 2018.In order to quantitatively analyze the reliability of local magnitude measurement based on acceleration, this paper first uses the determination method and gauge function specified in the new national standard of magnitude to determine the magnitude based on acceleration record, and compares the measured result with that measured by Jiangsu seismic network based on velocity record, and obtains the linear fitting relationship:ML(ACC)=0.987ML+1.371. We also calculate the absolute deviation between 15 324 groups of magnitude based on acceleration measurement and manual cataloging magnitude. The results show that 87% of the results with the deviation are within ±0.5 level.After 4-order polynomial fitting, we find that the magnitude measured in the range of less than 200 km is slightly lower than that of manual cataloging, and there is no systematic deviation after the epicenter distance is 200 km. Generally speaking, the results of the two methods are in good agreement. The results show that it is feasible and reliable to use acceleration records to simulate WA displacement records to calculate ML magnitude.
ZHAN Xiaoyan,XU Shunqiang,ZHANG Dong et al. Study on the Calculation of near Earthquake Magnitude Measured by Acceleration Records in Jiangsu Province[J]. jgg, 2021, 41(5): 539-543.