On October 12th, 2019, a MS5. 2 earthquake occurred in Beiliu City, Guangxi Zhuang Autonomous Region, China, with a focal depth of 10 km. The epicenter is locat
This paper analyzes two types of power supply interference encountered in the observation of geomagnetic second data: the HVDC interference and the discharge in
On August 20th, 2019, a M4. 2 earthquake occurred near Zhanan and Lixin Village, Tianya District, Sanya City, Hainan Province. We conduct field investigations i