Author:
Chen Kou-Cheng,Kim Kwang-Hee,Wang Jeen-Hwa,Chen Kuo-Chang
Abstract
AbstractAn earthquake sequence that occurred in the Hualien area during April 7 to August 30, 2021 has been recognized as two swarms by the Central Weather Bureau. Its earthquakes with ML ≤ 6.2 (ML = local magnitude) and focal depths ≤ 25 km were located in an area from 23°46’ N to 24°04’ N and from 121°25’ E to 121°42’ E. The Morlet wavelet technique is applied to analyze the dominant periods of temporal variations in numbers of daily events for the earthquake sequence in two magnitude ranges, i.e., ML ≥ 3 and ML ≥ 4. Results show that the dominant periods are 30.8 and 38.0 days when ML ≥ 3; while the dominant period does not exist when ML ≥ 4. The fluctuation analysis technique in the natural time domain is used to study the memory effect in the swarm for two magnitude ranges, i.e., ML ≥ 3 and ML ≥ 4. Calculated results show that the memory effect is stronger for the time sequence of magnitudes than for that of inter-event times and higher for ML ≥ 3 earthquakes than for ML ≥ 4 events. Consequently, only the short-term corrected memory effect was operative in the earthquake sequence of the Hualien swarms.
Publisher
Springer Science and Business Media LLC
Subject
Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Oceanography
Reference69 articles.
1. Bak P, Tang C (1989) Earthquake as a self-organized critical phenomenon. J Geophys Res 94:15635–15637. https://doi.org/10.1029/JB0941iB11p15635
2. Bunde A, Eichner JF, Kantelhardt JW, Havin S (2005) Long-term memory: a natural mechanism for the clustering of extreme events and anomalous residual times in climate records. Phys Rev Lett 94(4):698–701
3. Chatfield C (1989) The analysis of time series: an introduction, 4th edn. Chapman and Hall, London, p 241
4. Chen KC (2003) Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan. Earthquake Geophys Res Lett 30(11):1551. https://doi.org/10.1029/2003GL017193
5. Chen KC, Wang JH (1986) The May 20, 1986 Haulien, Taiwan earthquake and its aftershocks. Bull Inst Earth Sci Acad Sin 6:1–13
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献