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9个发生于观测台网区域上地壳内的地震 ,用P波到时定位 ,从Tp～Ts -p图得出高Vp Vs值 ,显示了低速S波存在的信息。在资料有限情况下 ,假设震中距不变 ,反演震源深度 ,发震时 ,Vp和Vs ,得出Vp =5 90km s ,Vs =3 0 4km s ,Vp Vs =2 94。Vp比区域的同深度平均P波速度 6 0km s低 1 7% ,Vs比按弹性介质的S波速度 =Vp 1 732低 12 4%。这种低速结果符合富含液性物质介质的性质 ,在探测火山区内存在部分熔融岩石或岩浆囊有重要参考价值。
Nine earthquakes occurred in the upper crust of the observatory network area. P-wave arrival time was used to locate the high Vp Vs from Tp-Ts-p, which showed the existence of low-speed S-wave. Vp = 5 90km s, Vs = 340km, Vp Vs = 2 94, assuming that the epicentral distance is constant and inversion of source depth, seismogenic time, Vp and Vs are assumed. Vp is 17% lower than the same depth average P-wave velocity of 6 0km s in the region, and Vs is 12 4% lower than the S-wave velocity of the elastic medium = Vp 1 732. This low-speed result is in line with the nature of the liquid-rich medium and has important reference values for detecting the presence of partially molten rocks or magma pockets in the volcanic area.