a China Ship Research and Development Academy, Beijing 100101, China
b Wuhan Maritime Communication Research Institute, Wuhan 430079, China
c Institute of Geology, China Earthquake Administration, Beijing 100029, China
d Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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The Extremely Low Frequency Engineering Project for Underground Exploration
a China Ship Research and Development Academy, Beijing 100101, China
b Wuhan Maritime Communication Research Institute, Wuhan 430079, China
c Institute of Geology, China Earthquake Administration, Beijing 100029, China
d Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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