【摘要】 沿四川红原至甘肃武威一线布设了20个宽频带地震台站,在一年的观测时间里共接收到81次远震记录,利用台站记录的远震P波波形数据和接收函数方法,获得了沿测线的接收函数剖面、每个台站下方的S波速度结构.研究结果表明,研究区地壳速度结构复杂,整个地壳的平均S波速度偏低.在四川阿坝弧形断裂—秦岭地轴北缘断裂之间,地壳中10～40km的深度范围内普遍存在低速层,是阿尼玛卿古特提斯洋从闭合、斜向碰撞到俯冲板块折返或逆冲岩片抬升等复杂地质过程所形成的构造特征.沿剖面莫霍面深度约为50km,南边略深北边略浅.更多还原

【Abstract】 Twenty broadband seismographs were deployed along Hongyuan,Sichuan to Wuwei,Gansu.81 teleseismic events were recorded in one year.We computed receiver functions from teleseismic waveform data and obtained S wave velocity structure beneath each station along the profile by using receiver function inversion method.The results revealed that the crustal structure is very complex and crustal average S wave velocity is to be on the low side.Low velocity structure generally exists in the depth range of 10~40 km in the crust between Aba Arc fault and Northern edge fault of Qinling earth’s axis and it is a tectonic feature of complex geological process such as ancient A’nyêmaqên Tethys ocean from closing and side colliding to subducted plate exhumed or thrust rock slice lifted.The Moho is about 50 km depth along the profile and is slightly deep in the south than in the north.更多还原