CAJ | 학술논문

为了确定2013年4月20日芦山地震部分余震的震源参数及传播路径对地震波的衰减特性，选取30次余震中15个强震台站获取的179组加速度记录，选择其中一次余震作为参考事件，基于广义反演方法计算了芦山余震的位移震源谱及品质因子，采用网格搜索方法确定余震震源参数，进一步确定了震源参数的定标关系。结果表明：芦山地震平均应力降略低于汶川余震平均应力降，震级与应力降没有明显相关性，视应力与应力降正相关；该研究区域0?5～20 Hz频段品质因子为Q（ f）＝31?867f1?0375，地震波衰减速度较快。
위료학정2013년4월20일호산지진부분여진적진원삼수급전파로경대지진파적쇠감특성，선취30차여진중15개강진태참획취적179조가속도기록，선택기중일차여진작위삼고사건，기우엄의반연방법계산료호산여진적위이진원보급품질인자，채용망격수색방법학정여진진원삼수，진일보학정료진원삼수적정표관계。결과표명：호산지진평균응력강략저우문천여진평균응력강，진급여응력강몰유명현상관성，시응력여응력강정상관；해연구구역0?5～20 Hz빈단품질인자위Q（ f）＝31?867f1?0375，지진파쇠감속도교쾌。
A large number of strong ground motion recordings have been collected by the National Strong?Motion Observation Network System of China in the Lushan earthquake sequences after April 20, 2014. In order to estimate the source parameters of the Lushan aftershocks and the attenuation characteristic of the seismic waves, this study selected 179 acceleration recordings obtained from 15 strong motion stations in 30 aftershocks to estimate the displacement source spectrum and quality factor, based on the generalized inversion technique of the S?wave Fourier amplitude spectrum with one aftershock as the reference event. Various source parameters are estimated by using grid searching technique for each event on the basis of displacement source spectra. It is shown that the average stress drop is slightly lower in Lushan earthquake than that in Wenchuan earthquake. Stress drop is significantly independent on the magnitude, while the apparent stress and the stress drop have favorable positive correlation. The frequency?dependent quality factor Q( f) in this region is found to be 31?867f1?037 5 with the frequency ranging from 0?5 to 20 Hz, the seismic wave attenuates quite faster in Lushan region.