| 柴达木盆地低頻地震探測的“迴折”波和多次波 |
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| 引用本文： | 曾融生,何傳大,阚荣举.柴达木盆地低頻地震探測的“迴折”波和多次波[J].地球物理学报,1961,10(1):39-53. |
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| 作者姓名： | 曾融生 何傳大 阚荣举 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 在柴达木盆地,利用低頻折射地震的方法,曾經得到許多不同类型的波,其中包括有: （i）沉积岩首波; （ii）基岩首波; （iii）大角度反射波; （iv）“迴折”波; （v）不同类型的多次波; （vi）地壳深界面的反射波. 本文专門討論“迴折”波和不同类型的多次波的性貭,以及辨认他們的主要标志;其他波的性貭,将在另文中討論.
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| 关 键 词： | 柴达木盆地 多次波 多次反射波 首波 反射界面 不同类型 大角度反射 速度梯度 接收点 视速度 |
THE REFRACTED WAVES AND MULTIPLE WAVES IN CHAI-DA-MU BASIN BY LOW-FREQUENCY SEISMIC REFRACTION WORK |
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| TSENG JUNG-SHENG HO CHUAN-DA KAN YUNG-CH.THE REFRACTED WAVES AND MULTIPLE WAVES IN CHAI-DA-MU BASIN BY LOW-FREQUENCY SEISMIC REFRACTION WORK[J].Chinese Journal of Geophysics,1961,10(1):39-53. |
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| Authors: | TSENG JUNG-SHENG HO CHUAN-DA KAN YUNG-CH |
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| Institution: | Institute of Geophysics and Meteorology, Academia Sinica |
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| Abstract: | The records obtained from the low-frequency refracted work carried out in Chai-Da-Mu Basin are characterized by fruitful multiple waves. It has been confirmed by both the velocity logging materials and the refracted records themselves that within two or three kms from the ground surface, there exist several contact zones which possess velocity gradients. The energy of these seismic rays returns back to the ground surface, when they travel at grazing angles within these zones of varying velocities. These refracted waves have undergone little energy conversion, therefore their high order multiples can be detected with strong intensities even at a distance of 10-30 km from the shot point. The multiples obtained in Chai-Da-Mu Basin include:（1） the multiple refrac!ed waves; （2） the reflected refractions; （3） the refracted reflections and （4） the multiple reflected reflections. The properties of these multiple waves and the methods of their discrimination are described. It was noticed also that these multiple waves have shown prominent directivities in their receiving. The cause for such directivities are discussed. |
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