Quasi-real-time inversion of significant earthquake rupture process based on Earthquake Early Warning System of China: Applications to the 2017 Mw 6.5 Jiuzhaigou earthquake and the 2022 Mw 6.7 Menyuan earthquake

Abstract

Abstract The significant earthquake rupture process shows the earthquake focal physics, the earthquake generation process and Earth vibration superposition propagation process. Almost all studies of the large earthquakes' rupture process took several days to publish after the origin time. With the growth of Earthquake Early Warning (EEW) systems in China, the parts of the system are already in operation. The earthquake early warning network with dense station distribution gives us a better choice, making it possible to invert the earthquake rupture process in quasi-real-time. The 2017 Jiuzhaigou Mw 6.5 earthquake occurred in Sichuan Province of China and the 2022 Menyuan Mw 6.7 earthquake occurred in Qinghai Province of China. The 2017 Jiuzhaigou earthquake and the 2022 Menyuan earthquake were respectively recorded by hundreds of strong motion instruments, and the waveform data were transmitted back to the data analysis center in real time. With the help of the automatic site selection procedure and the automated preprocessing procedure, the rupture process of earthquakes can be published in 30 minutes after the earthquake origin time.