**Acknowledgements**

We are grateful to Prof. Wu Zhongliang in the Institute of Earthquake Forecasting, China Earthquake Administration, Prof. John B. Rundle in UC Davis, and Jiang Changsheng in Institute of Geophysics, China Earthquake Administration for their assistance and guidance with the nowcasting method and earthquake catalog analysis. The earthquake catalog utilized in this investigation was given by the China Earthquake Networks Center (CENC). This study is also sponsored by the National Natural Science Foundation of China (42004038, U2039207), the National Key Research and Development Program of China (2018YFE0109700) and the Special Fund of the Institute of Earthquake Forecasting, China Earthquake Administration (CEAIEF2022030206).
