【摘要】 利用新疆塔里木盆地附近喀什和高台地震台所记录到的天然地震面波资料,研究了该地区的地壳结构,并测定了瑞利波Q_R值。 结果表明:塔里木盆地地壳为多层结构,地壳厚度约60公里,其中沉积层厚度约为10公里,是造成塔里木盆地的面波群速度异常低的主要因素。同时,地壳中部有一低速层;长周期瑞利波Q_R值偏低,反映了地震波在该区的地壳下部和上地幔的强衰减。更多还原

【Abstract】 In this paper, the data used are seismograms recorded at Kashi (KS) and Gaotai (GT) stations, both near Tarim Basin in Xinjiang. The crustal structure for this region is determined using the single station, multiple filtering technique. In addition, determinations of the QR values for Rayleigh waves are made by means of the two-station method. The results show that the crust of Tarim Basin is of multilayer structure. The anomalous low velocities of Eayleigh wave are mainly due to the sedimentary layer of 10 kilometer thickness, also thtre is a low velocity layer in the middle of the crust. The observed QR values of the longer periods, much lower than those of continent crust indicate a strong attenuation for seismic waves through this region.更多还原