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North China sub-craton lithospheric structure elucidated through coal mine blasting
  • ISSN号:1001-6538
  • 期刊名称:Chinese Science Bulletin
  • 时间:0
  • 页码:669-676
  • 分类:TD82[矿业工程—煤矿开采;矿业工程—矿山开采] TD235.11[矿业工程—矿井建设]
  • 作者机构:[1]Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China
  • 相关基金:Supported by National Natural Science Foundation of China (Grant No. 90814012) and National Basic Research Program of China (Grant No. 2004CB428400) Contribution No.: 0801, Geophysical Exploration Center, China Earthquake Admini- stration
  • 相关项目:用超长观测距地震宽角反射/折射剖面研究华北克拉通北部岩石圈结构和性质
中文摘要:

我们在场沿着向东南从爆炸的点通过银川盆和 Ordos 块的 】1300-km-long 侧面的超级范围的地震观察被触发由一大 --( 炸毁) 规模煤在 Ningxia Hui 自治区域的 Helan 山爆炸(产出侧面) 。震波信息从最高反映不同深度的披风被中国大陆人获得地震调查。Pn 测定了波浪从最高披风有效地被跟踪直到 500 km 并且在以外。动态的马厩和 Pn 波浪组的运动学的特征显示最高在 Ordos 块下面的披风是有一个弱积极坡度的轻轻地变化的结构。如果 Pm1, Pm2 波浪从上面的披风被看作波浪组,可以分别地在有 7.70 7.80 km/s 和 8.10 8.20 km/s 的平均速度的上面披风的结构有不同结构的阶层。基于 Pm1 的旅行时间曲线特征, Pm2 波浪,可以有有在 M1 和 M2 接口之间的反向的速度的某个层。他们显示的深度范围是大约 110 120 km 和 200 220 km。这些现象基本上在这个区域反映上面披风的岩石圈的结构的特征。获得的信息可以为调查诺思中国 craton 石版印刷提供有意义的参考书球的结构,以及理解在内的不同的球形的层的形状和结构上面披风。

英文摘要:

We present a super-range seismic observation along the 〉1300-km-long profile passing through the Yinchuan basin and the Ordos block from the blasting point towards the southeast triggered by a large(dynamite) scale coal blast in the Ningxia Hui Autonomous Region's Helan Mountain (yielded a profile). The seismic wave information from the uppermost mantle reflecting different depths was obtained by the China continental seismic survey. Pn refracted waves from the uppermost mantle were effectively traced up to 500 km and beyond. The stable dynamic and kinematic characteristics of the Pn wavegroup indicate that the uppermost mantle below the Ordos block is a gently changing structure with a weak positive gradient, If Pml, Pm^2 waves are considered as the wave groups from the upper mantle, there may be distinct structural strata in the upper-mantle structures with average velocities of 7.70-- 7.80 km/s and 8.10--8.20 km/s, respectively. Based on the travel-time curve feature of Pm1, Pm2 waves, there may be a certain layer with a reverse velocity between the M1 and M2 interfaces. The depth range indicated by them is about 110--120 km and 200--220 km. These phenomena basically reflect the structural features of the upper-mantle lithosphere in this region. The information obtained may provide meaningful references for surveying North China craton lithospheric structures, as well as understanding the shapes and structures of different spherical layers within the upper-mantle.

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