| 新型甲烷气爆震源在青藏高原激发的信号特征研究 |
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| 关键词:methane detonation source Tibetan Plateau green and environmental |
| 基金项目:科技部重点研发课题(编号: 2018YFC0604102);中国地质科学院基本科研业务费项目(编号: JKY202015);国家自然基金(编号: 42074112);中国地质调查局地质调查项目(编号: DD20190015) |
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| 摘要: |
| Seismic Signal Characteristics of a New Source Based on Methane Gaseous Detonation in the Tibetan Plateau |
| Artificial seismic source, which is also known as active source and is used to excite seismic wave, is an important way to detect underground structures. With the increasing popularity of the environmental protection and safety, it is urgent to find the new artificial source which is suitable for the fragile ecology and harsh natural environment of the Tibetan Plateau. This paper introduces the data processing and preliminary result of the experiment with a Methane Gaseous Source (MGS) under the special environment of high altitude and low pressure in the Tibetan Plateau, which includes such methos as cluster analysis, linear stacking, and phase weighted stacking, in comparison with the signals from traditional dynamite sources (TDS) during the same period in the same area. The results show the following phenomena: (1) The frequency range of the seismic wave excited by MGS is much higher (the frequency band range is 1–50 Hz, the dominant frequency is 5–30 Hz) than that by TDS. The power from MGS of WB-76-1700, WB-70-2000 and WB-60-500 type are equivalent to 1.72 kg, 1.72 kg and 0.25 kg TDS respectively. The wave propagation distance is up to 6.5 km. The frequency range of seismic wave excited by TDS of 48 kg is lower than that by MGS within the dominant seismic frequencies band of lower than 20 Hz; (2) the signal waveform of MGS is irrelevant to the device type of MGS, but depends on the epicenter distance and random detonation process; (3) it is much more suitable for shallow exploration and is especially effective in polymetallic ore concentration area with more complex wave propagation path. The efficiency in field work of MGS is higher than that of TDS. In brief, MGS is a new effective green and environmental artificial source. It is due to the small equivalent of MGS in this experiment that the travel distance of seismic waves excited by source is shorter than TDS of 48 kg. In the future experiment, higher signal-to-noise ratio seismic signal with larger distance would be recorded by enhancement of the equivalent of MGS. |
| JI Zhan-bo,LI Zong-xu,HE Ri-zheng,NIU Xiao,WU Wei.2022.Seismic Signal Characteristics of a New Source Based on Methane Gaseous Detonation in the Tibetan Plateau[J].Acta Geoscientica Sinica,43(2):224-234. |
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