Journal of Seismology

, Volume 18, Issue 3, pp 467–480 | Cite as

Memory effect in M ≥ 7 earthquakes of Taiwan

  • Jeen-Hwa Wang
Original Article


The M ≥ 7 earthquakes that occurred in the Taiwan region during 1906–2006 are taken to study the possibility of memory effect existing in the sequence of those large earthquakes. Those events are all mainshocks. The fluctuation analysis technique is applied to analyze two sequences in terms of earthquake magnitude and inter-event time represented in the natural time domain. For both magnitude and inter-event time, the calculations are made for three data sets, i.e., the original order data, the reverse-order data, and that of the mean values. Calculated results show that the exponents of scaling law of fluctuation versus window length are less than 0.5 for the sequences of both magnitude and inter-event time data. In addition, the phase portraits of two sequent magnitudes and two sequent inter-event times are also applied to explore if large (or small) earthquakes are followed by large (or small) events. Results lead to a negative answer. Together with all types of information in study, we make a conclusion that the earthquake sequence in study is short-term corrected and thus the short-term memory effect would be operative.


Earthquake sequence Magnitude Inter-event time Fluctuation analysis Phase portrait Memory effect 



The author thanks two reviewers for their valuable comments to improve the article. This work was sponsored by Academia Sinica (Taipei) and the National Science Council under grant no. NSC101-2119-M-001-015.


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Institute of Earth Sciences, Academia SinicaTaipeiTaiwan

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