Abstract
Statistical studies and empirical models play an important role in earthquake research. In this paper, a new statistical study was presented, evaluating if earthquake magnitude probability functions could be modeled by the Weibull distribution that is commonly used in many areas. On the basis of more than 50,000 earthquake data around Taiwan, the statistical analyses show that the hypothesis examined was not rejected by the statistics. That is, the earthquake magnitude probability function around Taiwan could be modeled by the Weibull distribution, with a substantial statistical significance.
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The author appreciates the Editor and Reviewers for their comments on the submission, making it much improved in so many aspects. The author also appreciates the financial support of HKUST with the project DAG09/10.EG03 for the study.
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Appendix: The Chi-square test
Appendix: The Chi-square test
The first step to conduct a Chi-square test is to compute the total difference between theoretical and observational frequencies in a histogram, and the difference is referred to as the Chi-square value (χ 2):
where o i and e i denote observational and theoretical frequencies; n is the number of data bins in the histogram. Then, according to probability and statistics, the total difference (or the Chi-square value) is considered a random variable following the Chi-square distribution with a degree of freedom of (n – 1 − k), where k is the number of parameters of the statistical model examined (Ang and Tang 2007). For example, k is equal to 2 for the Weibull distribution given model parameters α and β present.
The next step of the Chi-square test is to calculate the critical value at a given level of significance (usually 5 %). As the schematic diagram shown in Fig. 9, the level of significance is actually the right-tail probability against the critical value. As a result, if the hypothesis is reasonable and acceptable, there should be a relatively large probability (i.e., 95 %) for the Chi-square value calculated less than the critical value. By contrast, if the Chi-square value is still greater than the critical value even though the probability is rather small (i.e., 5 %), the model used for the simulation might not be acceptable, or the hypothesis should be rejected from a statistical point of view.
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Wang, J.P. Reviews of seismicity around Taiwan: Weibull distribution . Nat Hazards 80, 1651–1668 (2016). https://doi.org/10.1007/s11069-015-2045-7
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DOI: https://doi.org/10.1007/s11069-015-2045-7