The Key Laboratory of Deep Geodynamics of the Ministry of Deep Geodynamics in Qinghai Menyuan Earthquake Research Has achieved results

Recently, the research team of Li Haibing of the Key Laboratory of Deep Ground Dynamics of the Ministry of Natural Resources carried out a scientific investigation of earthquake emergency in the earthquake-stricken area of Menyuan Hui Autonomous County, Qinghai Province, and through the field on-site investigation of the distribution and characteristics of surface ruptures in the same earthquake, it understood the rupture process, seismic rupture and seismic mechanism of the earthquake, studied and judged the seismic trend, and provided scientific data for the understanding of the deep structure of the fault zone, earthquake prevention and disaster reduction.

At 1:45 a.m. on January 8, 2022, a magnitude 6.9 earthquake occurred in Qinghai Menyuan. The research team of the Key Laboratory of Deep Ground Dynamics of the Ministry of Natural Resources went to the earthquake-stricken areas to carry out scientific investigations as soon as possible after the earthquake. During this period, the researchers carried out detailed field investigation and measurement work on the surface rupture of the concentric earthquake, and the results showed that the seismic kinematic properties of the gate source were mainly left-walking and slippery, and the local thrust component was basically the same as that of the fault trajectory, which proved that the fault had strong activity.

The researchers used drones and the like to generate high-precision DEM (digital elevation model) images. The measurement results of the co-seismic surface dislocation show that the linear landforms such as rivers, gullies and steep ridge edges are staggered by the left row, and the maximum cohosmopolitan surface dislocation along the Lenglongling section is more than 2.2 meters, and the maximum horizontal dislocation in the Tolle Mountain section is 0.7 meters. In addition, the researchers found that the surface rupture was mainly a tensile fissure distributed in the right order goose column, with a maximum depth of more than 6 meters and a maximum width of more than 3 meters, accompanied by extrusion bulges and fault steep ridges, showing a typical left-walking glidoscopic properties of seismic surface rupture.

It is reported that the Key Laboratory of Deep Ground Dynamics of the Ministry of Natural Resources is established by the Institute of Geology of the Chinese Academy of Geological Sciences, which mainly carries out basic and cutting-edge scientific research with deep ground dynamics as the core, and is an important base for serving the national strategic needs of deep ground, producing original breakthrough achievements, and cultivating innovative talents and teams. (Ma Xiaoli, Bai Mingkun)