1 Lithosphere Research Centre, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Eearthprobe and Geodynamics Open Laboratory of Chinese Academy of Geological Sciences, Beijing 100037, China
200-kg large explosive detonation facing 50-km thick crust beneath west Qinling, northeastern Tibetan plateau
1 Lithosphere Research Centre, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Eearthprobe and Geodynamics Open Laboratory of Chinese Academy of Geological Sciences, Beijing 100037, China
摘要It is difficult to acquire deep seismic reflection profiles on land using the standard oil-industry acquisition parameters. This is especially true over much of Tibetan plateau not only because of severe topography and rapid variation of both velocity and thickness of near-surface layer, but also strong attenuation of seismic wave through the thickest crust of the Earth. Large explosive sources had been successfully detonated in US, but its application in Tibetan plateau rarely has an example of good quality. Presented herein is the data of a 200-kg single shot we recorded in west Qinling, northeastern Tibetan plateau. The shot gather data with phenomenal signal-to-noise ratios illustrate the energy of the PmP phase. Although the observations are only limited to the northeastern Tibetan plateau and thus cannot comprise an exhaustive study, they nevertheless suggest that large explosions may be a useful exploration tool in Tibetan Plateau where standard seismic sources and profiling methods fail to produce adequate data of low crust.
Abstract:It is difficult to acquire deep seismic reflection profiles on land using the standard oil-industry acquisition parameters. This is especially true over much of Tibetan plateau not only because of severe topography and rapid variation of both velocity and thickness of near-surface layer, but also strong attenuation of seismic wave through the thickest crust of the Earth. Large explosive sources had been successfully detonated in US, but its application in Tibetan plateau rarely has an example of good quality. Presented herein is the data of a 200-kg single shot we recorded in west Qinling, northeastern Tibetan plateau. The shot gather data with phenomenal signal-to-noise ratios illustrate the energy of the PmP phase. Although the observations are only limited to the northeastern Tibetan plateau and thus cannot comprise an exhaustive study, they nevertheless suggest that large explosions may be a useful exploration tool in Tibetan Plateau where standard seismic sources and profiling methods fail to produce adequate data of low crust.
基金资助:the International Sciences and Technology Cooperation (2006DFA21340), the special funds for the Sciences and Technology Research of Public Welfare Trades (200811021), the key innovation project of sciences and technology of Ministry of Land and Resources (1212010711813), the basic outlay of scientific research work from Ministry of Science and Technology of the People’s Republic of China (J0803), the National Natural Science Foundation of China (40830316 and 40874045), and SINOPPROBE-II