Earthquake clustering relative to lunar phases in Taiwan

Cheng Horng Lin, Yih Hsiung Yeh, Yuh Ing Chen, Jann Yeng Liu, Kuang Jung Chen

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)


The occurrence of local seismicity recorded in Taiwan for the period of 1973-1991 was converted to lunar time to reassess the notion that some earthquakes may be triggered by tidal forces. The abundant seismicity on the basis of lunar time provides not only sufficient data for statistical analysis but also the most direct and reliable estimation of tidal effects on earthquake triggering. Significant clustering of smaller earthquakes (2.5<ML<5) was found around Day 14, with clustering around the full moon day being about 30% higher in frequency than that on other non-full moon days. These phenomena indicate that tidal forces caused by lunar attraction can indeed trigger some smaller earthquakes. On the other hand, the paucity of any correlation between larger earthquakes (ML>5) and lunar phases indicates that larger earthquakes are barely induced by tidal forces, but predominantly by tectonic forces. No clear correlation between micro-earthquakes (ML<2.5) and lunar phases suggests that, in addition to tectonic and tidal forces, their occurrence must be primarily associated with other factors.

頁(從 - 到)289-298
期刊Terrestrial, Atmospheric and Oceanic Sciences
出版狀態已出版 - 9月 2003


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