Distinct Dual-mode inter-event slip and cascade triggering during the 2019 Ridgecrest, California foreshock/mainshock earthquake sequence

Zheng-Kang Shen, Han Yue, Jianbao Sun, Min Wang, Lian Xue, Weifan Lu, Yijian Zhou, Chunmei Ren, & Mingjia Li

Submitted August 15, 2019, SCEC Contribution #9708, 2019 SCEC Annual Meeting Poster #264

Cascade and slow-slip processes are believed to control interactions between foreshocks, mainshocks, and aftershocks, although their relative contributions are poorly resolved. Discrimination between these processes will shed light on the understanding of earthquake physics, yet it requires exceptional observations of earthquake sequences. The 2019 Ridgecrest, California foreshock-mainshock earthquake sequence provides such an opportunity. A comprehensive study of seismic and geodetic data reveals the co-seismic slip and inter-event slip process of this sequence. The overall sequence involves 4 major fault planes with sub-parallel and orthogonal geometry. We resolve distinct seismic (cascade) and aseismic (creeping) slip on two orthogonal faults during the inter-event time period, and find that asperity sizes and/or co-seismic stress changes may have contributed to this dual-mode slip behavior.

Key Words
Ridgecrest Earthquake, Inter-invent Slip, Cascade Triggering

Citation
Shen, Z., Yue, H., Sun, J., Wang, M., Xue, L., Lu, W., Zhou, Y., Ren, C., & Li, M. (2019, 08). Distinct Dual-mode inter-event slip and cascade triggering during the 2019 Ridgecrest, California foreshock/mainshock earthquake sequence. Poster Presentation at 2019 SCEC Annual Meeting.


Related Projects & Working Groups
Ridgecrest Earthquakes