腾冲火山区地震事件(LP,VT,VE)的识别研究
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摘要
利用腾冲流动数字台网资料 ,用多种方法对腾冲火山区的地震事件进行识别研究 ,认为腾冲火山区记录到的地震事件按波形主要分为两类 :P波最大振幅明显大于S波及Lg波最大振幅的事件 ;P波最大振幅小于S波及Lg波最大振幅的事件。其中P波最大振幅明显大于S波及Lg波最大振幅的事件是火山地震的可能性较大。根据多个事件频谱随时间变化扫描图中的频谱特征 ,认为目前这个地区未记录到长周期事件 ;但流动台网记录到几组振幅较小、频率较高、振动持续时间比腾冲地震事件的持续时间 (一般为 6～ 7s)明显长、达2 0余秒的颤动事件 ,波形与Tremor事件典型图有相似之处 ,这几个事件是否是Tremor事件 ,值得深入研究
Using the data from Tengchong mobile digital network and different methods,the study on distinguishing seismic events in the Tengchong volcanic region is made.It is thought that the seismic events recorded in the Tengchong volcanic region can be classified as the two kinds according to their waveforms,the events with the P waves' maximum amplitudes more than the maximum amplitudes of S and Lg waves and the events with the P waves' maximum amplitudes less than the maximum amplitudes of S and Lg waves.Of the two kinds of these events,the events with the P waves' maximum amplitudes more than the maximum amplitudes of S and Lg waves may be volcanic earthquakes.Although it is believed that the events with long period have not been recorded in the Tengchong region according to frequency spectrum features in the scamming figure of variation in frequency spectrum with time,the mobile network recorded some tremor events with small amplitudes,high frequencies,longer vibration duration of over 20 seconds more than the vibration duration of 6 to 7 seconds of the seismic events in Tengchong and the waveforms similar to ones of typical tremor events.It is necessary to thoroughly study if these events are tremor events.
Using the data from Tengchong mobile digital network and different methods,the study on distinguishing seismic events in the Tengchong volcanic region is made.It is thought that the seismic events recorded in the Tengchong volcanic region can be classified as the two kinds according to their waveforms,the events with the P waves' maximum amplitudes more than the maximum amplitudes of S and Lg waves and the events with the P waves' maximum amplitudes less than the maximum amplitudes of S and Lg waves.Of the two kinds of these events,the events with the P waves' maximum amplitudes more than the maximum amplitudes of S and Lg waves may be volcanic earthquakes.Although it is believed that the events with long period have not been recorded in the Tengchong region according to frequency spectrum features in the scamming figure of variation in frequency spectrum with time,the mobile network recorded some tremor events with small amplitudes,high frequencies,longer vibration duration of over 20 seconds more than the vibration duration of 6 to 7 seconds of the seismic events in Tengchong and the waveforms similar to ones of typical tremor events.It is necessary to thoroughly study if these events are tremor events.
引文
[1]周真恒,韩新民,周瑞奇.云南腾冲地区的岩石圈热结构〔J〕.地震地磁观测与研究,1996,17(4):34～41.
[2]冯德益、陈化然.根据地震波形和频谱判断火山地震类型的新方法〔A〕.见:火山作用与人类环境〔M〕.北京:地震出版社,1996,91～97.
[3]BernardChouet.Aseismicmodelforthesourceoflong-periodeventsandharmonictremor.VolcanicSeismology〔A〕.see:IAVCEIProceedingsINVolcanology〔C〕.1992.3:134～156.
[4]林邦慧、李大鹏.用Lg波与P波数字化资料鉴别与当量估计东哈萨克斯坦核爆炸的方法研究〔J〕.地震地磁观测与研究,1997,18(6a):60～69.
[5]CosentinoM .,GrestaS .,LombardoG .,Patane.FeaturesofvolcanictremorsatMt.Etna(Sicily)duringtheMarch-August1983eruption〔J〕.BullVolcanol,1984,47:930～940.
[6]DelPezzoE .,DeMartinoS .,Martini.VelocityandspectralcharacteristicsofthevolcanictremoratEtnadeducedbyassmallseismoneterarray〔J〕.J .Volcanol.Geotherm.Res.,1993,56:369～378.
[2]冯德益、陈化然.根据地震波形和频谱判断火山地震类型的新方法〔A〕.见:火山作用与人类环境〔M〕.北京:地震出版社,1996,91～97.
[3]BernardChouet.Aseismicmodelforthesourceoflong-periodeventsandharmonictremor.VolcanicSeismology〔A〕.see:IAVCEIProceedingsINVolcanology〔C〕.1992.3:134～156.
[4]林邦慧、李大鹏.用Lg波与P波数字化资料鉴别与当量估计东哈萨克斯坦核爆炸的方法研究〔J〕.地震地磁观测与研究,1997,18(6a):60～69.
[5]CosentinoM .,GrestaS .,LombardoG .,Patane.FeaturesofvolcanictremorsatMt.Etna(Sicily)duringtheMarch-August1983eruption〔J〕.BullVolcanol,1984,47:930～940.
[6]DelPezzoE .,DeMartinoS .,Martini.VelocityandspectralcharacteristicsofthevolcanictremoratEtnadeducedbyassmallseismoneterarray〔J〕.J .Volcanol.Geotherm.Res.,1993,56:369～378.
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