On December 27, a team from the national disaster research institute, including Li Dewen, Jiang Wenliang, Yi Luo, Li Linlin and Jiao qisong, returned to Beijing, the field investigation of the Jishishan earthquake (M6.2) in Gansu province was completed.

During the on-site investigation, the working group carried out the Nakagawa earthquake secondary disaster investigation, the earthquake surface rupture investigation, the earthquake-damaged buildings unmanned aerial survey work. Large-scale UAV images were acquired to investigate the landform and lithologic characteristics of the Nakagawa earthquake-induced mudflow disaster. Ground penetrating radar measurements were carried out and lithologic samples were collected from typical strata sections. The topography and landforms around the site were investigated and analyzed, and large-scale aerial images of the watershed where the site is located were collected. At the same time, the working group investigated deeply in the polar earthquake area, and found the surface fissures caused by the earthquake.

In the next step, the working group will continue to analyze and collate the data collected in the field, and conduct in-depth studies on the seismogenic structure, secondary disaster process, mechanism and control factors of the earthquake, to provide scientific advice for the planning and construction of disaster prevention and reduction in the region as soon as possible.