The Geological Environment Monitoring Institute (Technical Guidance Center) of the China Geological Survey provided the Ministry of Natural Resources with the distribution of hidden dangers and historical disasters in the earthquake zone. On the 18th, according to the instructions of the leaders of the Ministry, the Environmental Monitoring Institute (Technical Guidance Center) immediately acted. First, do a good job in collecting disaster information, keep all the staff on standby, and keep the communication open. Second, pay close attention to the rain and do the geological disasters in the earthquake zone. The risk warning and forecasting; the third is that the experts and technicians working in Sichuan are put into disaster relief on the spot, and the local natural resources department will provide technical support for the rescue and rescue, and guide the local authorities to do the hidden troubles of the secondary geological disasters after the earthquake; The monitoring equipment went to the first line, and tried the universal monitoring and early warning equipment developed in the early stage, using the actual test and improving the function. After two days of on-the-spot investigation and research, the expert group selected two geological hazard points in Shuanghe Town, Changning County as the prototype deployment point.
The Natural Resources Aviation Geophysical and Remote Sensing Center of the China Geological Survey launched the remote sensing emergency investigation work at the first time after the earthquake. After determining the epicenter location, the satellite remote sensing image map before the Yibin earthquake was completed on the morning of June 18. At the same time, the first time to quickly deploy post-disaster satellite data acquisition work, arrange high scores, high scores 2, high scores 3, high scores 1 B, C, D stars, high scores 4 and other domestic satellite programming, The preliminary remote sensing interpretation of the disaster was carried out, and the interpretation results were reported to the Ministry of Natural Resources and the China Geological Survey for the first time. At present, the Hang Yao Center is still paying close attention to the satellite data acquisition after the disaster, and carries out satellite remote sensing data processing, image map production and geological disaster interpretation.
After the earthquake, the “Active Structure and Fracture Team” led by Li Haibing, a researcher at the Geological Survey of the China Geological Survey, quickly launched an emergency mechanism, discussed issues such as the seismogenic mechanism, and organized the elite members to go to the site to conduct field investigations. . The research team conducted on-the-spot investigation on the damage distribution of the damaged ground and its houses. Based on the analysis of the two-hour main shock and aftershock data after the earthquake, combined with the results of the previous large earthquake activity fracture study, it is concluded that the earthquake will not cause surface rupture and deep underground rupture. The belt (seismic fault) may be in the northwest-south direction and the length is about 20 kilometers. From the perspective of the focal mechanism analysis, the earthquake has the characteristics of slip and thrust. According to the analysis of the source data of the aftershocks and combined with the regional geological survey data, the research team believes that the seismogenic fault is located in the Changning anticline axis, and the long axis of the anticline is the northwest-south-east direction, presumably affected by the earthquake. The area may be distributed near the southeastern part of the earthquake-stricken fault, namely Shuanghe Town of Changning County and Qiquan Town of Jixian County. This inference is consistent with the results of the field survey and the disaster report. In the next step, the research team will use the various monitoring data of the Wenchuan Earthquake Long-term Observatory to conduct an in-depth study of the earthquake mechanism.