Abstract

The materials of deep seismic studies carried out on the 1-SB reference geophysical profile and the areal interpretation of the seismological data obtained in the Trans-Baikal part of the Central Asian Fold Belt are presented. It is shown that longitudinal and transverse waves were recorded from the reference boundaries within the crust and the Moho surface in the Trans-Baikal region using explosions and powerful vibration sources on the 1200-km long 1-SB geophysical profile. The inhomogeneous upper crust velocity structure down to 15–20-km depths and the Moho surface was revealed from P- and S-waves. The anomalous mantle, which exhibited decreased boundary velocity values of P- and S-waves at 7.8–7.95 km/s and 4.3–4.5 km/s, respectively, was reliably traced within the Baikal Rift Zone from the DSS and seismological data. In the southeastern part of the area (the central Mongol-Okhotsk Orogenic Belt and adjacent folded structures of the Trans-Baikal region) a layer of increased P-and S-wave velocity values of 8.4 ± 0.15 km/s and 4.9 ± 0.05 km/s, accordingly, was detected at the mantle surface. A comparison was made with the materials of other studies.

中文翻译：

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从地震学和DSS数据（1-SB参考剖面的对准）看中亚褶皱带跨贝加尔河段深层速度结构特征

摘要

介绍了在1-SB参考地球物理剖面上进行的深层地震研究的材料，以及在中亚褶皱带跨贝加尔河段获得的地震数据的区域解释。结果表明，横波贝加尔地区的地壳和莫霍面的参考边界记录了纵波和横波，这些波是利用爆炸和强大的振动源在1200公里长的1-SB地球物理剖面上记录的。低至15–20 km深度的上地壳速度结构不均匀，莫霍面从P波和S波中揭示出来。从DSS和地震数据可以可靠地追踪到异常地幔，分别在7.8-7.95 km / s和4.3-4.5 km / s的P波和S波的边界速度值减小了。在该地区的东南部（蒙古-鄂霍次克州中部造山带和跨贝加尔湖地区的相邻折叠构造），形成了一层增加的P波和S波速度值，分别为8.4±0.15 km / s和4.9±0.05 km因此，在地幔表面检测到/ s。与其他研究的材料进行了比较。