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利用海上大容量气枪震源和陆上地震台站在南海北部进行海陆联测试验尚属首次.试验结果表明,“实验2号”调查船新枪阵的信号传播距离最远为255km,信号有效范围达5×104km2,覆盖了香港和珠江三角洲地区,比旧枪阵在信号强度、传播距离和有效范围等方面都有大幅度提高,说明气枪震源的更新改造是成功的.与其他地区已有的试验结果相比较,发现新枪阵的激发效果达到了国际同类震源的最好水平,特别是在利用陆上固定地震台站接收远距离海上气枪信号方面有新的突破,这对于沿海地区三维地壳结构的探测和“地震雷达”概念的实现具有重要的意义.
It is the first time to use the large-capacity air gun source and the onshore seismic stations to carry out sea-land joint testing in the northern part of South China Sea.The results show that the signal propagation distance of the new gun array of “Experiment 2” Up to 5 × 104km2, covering Hong Kong and the Pearl River Delta region, showing a significant increase in signal intensity, propagation distance and effective range compared with the old gun array, indicating that the renovation of the airgun source was successful. Compared with the experimental results, it is found that the excitation effect of the new gun array reaches the best level of the same kind of earthquakes in the world, and especially the new breakthrough is made in receiving signals of long-range offshore airstrikes from land-based fixed seismic stations. The detection of structure and the realization of the concept of “seismic radar” are of great significance.