巴塘地震台近震弱S波震级偏差研究

Magnitude Deviation of Seismic Weak S-wave of Batang Station

摘要:

分析了2009年至2012年巴塘台测定的M_L≥3.0的近震共540个,计算出了它们与中国地震台网中心(CSN)发布的M_L震级之间的偏差,找出了巴塘台弱S波出现的区域。用相同标准震级,相等震中距的方法,找出了正常波形记录与弱S波波形记录之间的振幅比,计算出了弱S波地震的震级偏差程度,发现该台记录到的弱S波的比例高达46.5%,弱S波的震级偏差达0.7,其结果有利于地震震级测定的准确性.

Abstract:

After analyzing 540 near earthquakes of M_L≥3.0 determined by Batang station from 2009 to 2012, we calculated the magnitude deviation from that released by China Earthquake Networks Center (CSN),and then found out the regions where weak S-wave occurred at Batang station. Using the methods of same standard magnitude and same epicenter distance, the amplitude ratio of normal waveform recording to weak S-waveform recording was found and the magnitude deviation degree of weak S-waveform earthquakes was also calculated; the former at Batang station is up to 46.5% and the latter is 0.7. This study could make the determination of earthquake magnitude of our station more accurate.