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Spatial Distribution of Seismic Moment Deficit in Xianshuihe Fault Zone and the 2022 Luding M 6.8 Earthquake
Yin Li, Zhou Bengang, Ren Zhikun, Luo Gang
PDF(4722 KB)
PDF(4722 KB)
Spatial Distribution of Seismic Moment Deficit in Xianshuihe Fault Zone and the 2022 Luding M 6.8 Earthquake
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On September 5, 2022, an M6.8 earthquake located at the Moxi fault at the southern end of the Xianshuihe fault zone. The seismogenic mechanism of this earthquake and whether large earthquakes will occur in this fault section in the near future are scientific issues worth attention. This paper attempts to explain the seismogenic mechanism of the earthquake and the potential seismogenic potential of the Xianshuihe fault zone in the future from the perspective of the accumulation and release of seismic energy. By comparing the temporal and spatial distribution of seismic moment accumulation and release, it is found that earthquakes mostly occur in the period of seismic moment deficit, and there is a tendency to fill the moment deficit. In addition, there are three significant moment deficit segments in Xianshuihe fault zone. All of these moment deficit fault segments have the potential to produce earthquakes of magnitude 6.5 or greater. After the 1786 Kangding M 7.6 earthquake, the accumulation of 200 years is enough to produce an earthquake of M 6.5 or above. The Luding M 6.8 earthquake only released a small part of the moment deficit on the Moxi fault, and there is still a possibility of a major earthquake on this fault section in the future.
moment deficit / Xianshuihe fault zone / Luding M 6.8 earthquake / seismic hazard assessment
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感谢两位审稿专家提出的建设性意见.附件见本刊官网：www.earth-science.net.
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