| 沉放深度对气枪震源激发信号影响的试验研究 |
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| 引用本文： | 黄艳丹,李军,金星,袁丽文,李强,邱毅.沉放深度对气枪震源激发信号影响的试验研究[J].地震学报,2018,40(4):430-439. |
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| 作者姓名： | 黄艳丹 李军 金星 袁丽文 李强 邱毅 |
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| 作者单位： | 1.中国福州 350003 福建省地震局 |
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| 基金项目： | 地震科技星火计划（XH16022Y）和国家自然科学基金（41774068）联合资助 |
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| 摘 要： | 以2014年11月福建街面水库气枪震源激发试验观测数据为研究对象，利用基于互相关的时延估计法对不同沉放深度及不同水深的气枪激发展开研究，分析沉放深度及激发环境水深对气枪震源激发信号到时的影响。结果显示:激发位置不变，气枪沉放深度在8—30 m范围内变化时，震中距为13 km的测震台站记录到的气枪信号的首脉冲到时差异很小，而气泡脉冲到时则有明显差异，且随着沉放深度的增加，气泡脉冲信号到时提前，8 m沉放深度与30 m沉放深度气泡脉冲的到时差近80 ms，这种变化与布设在库底的海底地震仪记录到的信号变化相一致，分析认为这种变化与气枪沉放深度增加引起的气枪激发信号的周期减小有关；在不同水位开展的相同沉放深度的激发信号差异不大。因此，应用气枪震源监测地壳介质变化时需注意气枪震源沉放深度变化所带来的影响。
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| 关 键 词： | 时间延迟 互相关法 水库气枪震源 沉放深度 波速变化 |
| 收稿时间： | 2017-09-29 |
Experimental research on the effects of explosion depth on the air-gun source excitation wave signals |
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| Affiliation: | 1.Fujian Earthquake Agency，Fuzhou 350003，China2.Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China3.College of Civil Engineering，Fuzhou University，Fuzhou 350001，China |
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| Abstract: | This paper investigates the effects of explosion depth and water-level on the time delay based on the experiments carried out at Jiemian reservoir in Sanming of Fujian by Fujian Earthquake Agency in November of 2014. Analyses on the data from the station YXBM show that under the same water level, pressure pulses are affected by air-gun explosion depth so little that the correlation coefficient is high and the time delay is low, while those of the bubble pulses are significantly different. They arrive faster as the explosion depth increases. The arrival time of bubble pulses advances nearly 80 ms when the explosion depth changes from 8 m to 30 m, which is quite consistent with the records of the ocean bottom seismometer. The time delay is related to the decreasing of the period of signals resulted from the explosion depth increasing. Both of the pressure pulses and bubble pulses are similar while stimulated at the same explosion depth of air-gun under different water levels. So the explosion depth should be considered in the future study of exploring and monitoring the subsurface structure and its temporal variations using air-gun active source. |
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