Identification of Repeating Earthquakes: Controversy and Rectification

Author:

Gao Dawei123ORCID,Kao Honn45ORCID,Liu Jianxin123

Affiliation:

1. 1School of Geosciences and Info-physics, Central South University, Changsha, China

2. 2Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Ministry of Education, Changsha, China

3. 3Hunan Provincial Key Laboratory of Nonferrous Resources and Geological Hazard Detection, Changsha, China

4. 4Pacific Geoscience Centre, Geological Survey of Canada, Sidney, Canada

5. 5School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada

Abstract

Abstract Repeating earthquakes (repeaters) are events that recurrently rupture the same fault patch with nearly identical magnitudes. Although repeaters have been widely studied and utilized in many fields over the last four decades, there are no standard criteria for reliably identifying such events. The current criteria adopted in the geophysical research community are inconsistent and difficult to justify. Different criteria may inescapably incur inadequate hypotheses and lead to controversial interpretations, highlighting the urgent need for seeking a uniform approach to reliably identify repeaters. In this study, we address this long-standing issue by deriving the most logical criteria on the basis of theoretical calculation with simple yet reasonable assumptions. Quantitatively, we define a repeating pair if their interevent distance is ≤80% of the rupture area of the larger event and their magnitude difference is ≤0.3. We demonstrate the superiority of our proposed approach with challenging cases in California, and our results shed new insight into the hierarchical fault structures in the source areas. Although this study focuses on defining repeating earthquakes, the application to repeating seismic events in other planetary bodies such as moonquakes and marsquakes is straightforward, potentially help avoid misinterpretations of the physical processes in both Earth and planetary interiors.

Publisher

Seismological Society of America (SSA)

Subject

Geophysics

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