【摘要】 本文用长周期面波资料研究了南北地震带及其西侧的地壳结构。结果表明:南北地震带的地壳厚度具有南薄北厚,西厚东薄的特征,南北带和其西侧区域地壳内都存在有低速层;地壳横波平均速度很低,约为3.37公里/秒;上地幔顶部的横波速度只有4.40公里/秒;南北带北段可能存在上地幔物质上隆,岩石圈厚度只有60多公里,该区域地壳底部存在有低速层。更多还原

【Abstract】 In this paper, the crust structure of North-South Seismic Zone and its western side has been studied using long-period surface wave data. The results show that the crust in north and west parts is thicker than its south and east parts. Low-velocity zone exists within the crust of the whole area of North-South Seismic Zone and its western side. The average S-wave velocity is very low, about 3.37 km/s, and the velocity in the uppermost mantle is 4.40 km/s. It is possible that there is an uprising of mantle materials in the north section of North-South Seismic Zone and the thickness of lithosphere is only 60 km with a low-velocity zone in the bottom of the crust.更多还原