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Discussion of local magnitude scale for deep earthquakes in Taiwan

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Discussion establishes a new attenuation model for deep earthquakes in Taiwan, enhancing magnitude estimation.

This study aims to develop a refined local magnitude scale for deep earthquakes in Taiwan by addressing overestimation issues.
Investigated deep earthquakes with focal depths greater than 35 km in Taiwan.
Established a depth-dependent logA0 attenuation model incorporating hypocentral distance and depth terms.
Analyzed the relationship between local magnitude (ML) and moment magnitude (MW) using the new model.
The new logA0 attenuation model produced a stable 1:1 relationship between ML and MW with a standard deviation of 0.16.
LogA0 attenuation varies systematically with distance and depth, facilitating more accurate magnitude estimations.
Average bias of overestimation for deep events was reduced from 0.5 magnitude units to a more reliable estimate.

Lin et al. (2026) studied this question.

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