The "Sanchakou" area, where the Xianshuihe-Longmenshan-Anninghe fault zone is distributed and intersected, is a special structural area in the eastern margin of the Qinghai-Tibet Plateau. It has frequent strong earthquakes in the history, and is a "window" and natural laboratory for studying the seismic activities of Sichuan-Yunnan rhomboid-shaped blocks. This observation is of great significance for studying the deep morphology and deformation characteristics of this fault zone.

A total of 160 sets of integrated short-period seismic data acquisition system observation equipment were deployed in the project, among which 120 sets of SmartSolo Scientific IGU-16HR EB 3C three-component data acquisition system showed strong advantages in the project observation, with its small structure, light weight, easy deployment and operation. The super endurance and waterproof capability provide a strong guarantee for the success of the project. After 105 days of observation, the project team finally completed data acquisition in early January 2021, obtaining about 5T of high-quality raw data. In addition, the remaining power of the device can also support about 25 days of power supply, which can meet up to 130 days of continuous collection.

Figure 1. Design point distribution diagram

Figure 2. Observation days

Figure 3. Summary of working days and data memory size of the SmartSolo Scientific collection station

(Eight of them were sampled at 4ms intervals, so the data size was only around 20GB, and the remaining 112 were sampled at 2ms intervals.)