基于能量守恒的气枪主动震源激发实验震级计算  

Calculation of Experimental Magnitude of Air Gun Active Source Excitation Based on Energy Conservation

作　　者：孙点峰 王亚红 秦满忠 王志栋 魏东星 SUN Dianfeng;WANG Yahong;QIN Manzhong;WANG Zhidong;WEI Dongxing(Gansu Earthquake Agency,Lanzhou 730000,China)

机构地区：[1]甘肃省地震局,兰州市730000

出　　处：《大地测量与地球动力学》2024年第11期1207-1210,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局“三结合”课题(3JH-202401082);甘肃省科技重大专项(21ZD4FA011);陕西省自然科学基础研究计划(2023-JC-QN-0330)。

摘　　要：分别运用Baker公式、Kinney公式、Broad公式计算甘肃刘家峡气枪主动源一次常规实验激发所释放的能量,并利用能量与震级之间的经验公式,估算一次常规实验产生地震的震级。通过分析刘家峡主动源实验场附近固定数字测震台站记录的单次激发数据发现,气枪激发时所释放的能量并未完全转换为地震波,如气枪主气室在爆破瞬间并非完全绝热,有部分能量随着热量传递而散失,故通过能量守恒方法计算的震级略大。实验结论与Kinney公式计算结果的一致性较好,符合实验实际工况条件。We use Baker formula,Kinney formula and Broad formula to calculate the energy released by a conventional test of Liujiaxia air gun active source in Gansu province,and use the empirical formula between energy and magnitude to estimate the earthquake magnitude generated by the test.At the same time,we analyze the single shot data recorded by fixed digital seismic station near Liujiaxia active source test site.The results show that the energy released by air gun during the shot is not completely converted into seismic waves.For example,the main air chamber of air gun is not completely insulated during blasting,there is some energy lost along with the heat transfer,so the magnitude calculated by energy conservation method is slightly larger.The conclusion is in good agreement with the result calculated by Kinney formula,which conforms to the actual working conditions of experiment.

关 键 词：气枪爆破 主动源 内能 能量转换 震级测定 

分 类 号：P315[天文地球—地震学]