海南区域地震与爆破震源参数特征

收集2008年以来海南测震台网记录的M_L 2.5以上地震及爆破资料,利用Brune圆盘模型,计算得出震源参数,发现地震、爆破的震源参数特征为:地震的拐角频率绝大多数大于爆破;地震应力降大于1,爆破应力降小于1;地震震源尺度绝大多数小于爆破。对一个有感疑爆事件,利用其拐角频率、应力降、震源尺度等参数,判定该事件为天然地震,与前人研究结果一致。由此可见,利用震源参数在地震速报、日常分析中判定事件类型具有实际意义。

Characteristics of seismic source parameters for earthquake and blasting and application in Hainan area

Data of earthquakes and explosions above M_L 2.5 recorded by the Hainan earthquake network since 2008 have been collected. Using the Brune disk model, the hypocenter parameters are calculated. We found that the hypocenter parameters of earthquakes and explosions are difference:Most of the corner frequencies of earthquakes are larger than those of blasting, the stress drop of the earthquake is greater than 1, while the stress drop of blasting is less than 1; Most of the focal dimensions of earthquakes are smaller than those of blasting. For a sensible suspected explosion event, its frequency, stress drop and focal dimension can be used to determine the type of the event. This event was a natural earthquake, consistent with previous research results. Thus it can be seen, the hypocenter parameter has practical significance in the earthquake quick report, daily analysis and the determination of the event type.