Preface to the Special Issue on Active Source
Research
WANG Baoshan1) and CHEN Yong2) 【期刊名称】中国地震研究（英文版） 【年(卷),期】2024(033)002 【总页数】3
The seismic waveforms may present subtle changes related to the external loadings such as earthquakes (Pei Shunping et al., 2024) and landslides (Larose E. et al., 2015). Monitoring subtle changes provides a complementary tool for studying the dynamic processes (e.g., Niu Fenglin et al., 2008), which has long been a major subject in seismology. The subsurface can be monitored by using natural repetitive events including repeated earthquakes (e.g., Song Xiaodong et al., 1996) and ambient seismic noises (e.g., Mao Shujuan et al., 2024). However, only the use of repeatable active sources can achieve long-distance and high-precision monitoring (Chen Yong et al., 2017).
Different active sources have been used to perform seismic monitoring at different scales (e.g., Niu Fenglin et al., 2024; Yamaoka K. et al., 2001). Among all sources, the airgun was one of the earliest used sources (e.g., Reasenberg P. A. et al., 1974) for this purpose. Science 2006, large-capacity airguns were used as a seismic source to explore and monitor the in-land crustal structures (Chen Yong et al., 2007). Until now, three
Preface to the Special Issue on Active Source Research
