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Title: | The 20th September 1999 Chi-Chi Earthquake (Taiwan) : a case of study for its aftershock seismic sequence |
Authors: | D'Amico, Sebastiano Caccamo, D. Parrillo, F. Lagana, C. Barbieri, F. M. |
Keywords: | Chi-chi Earthquake, Taiwan, 1999 Earthquake aftershocks -- Taiwan Earthquake magnitude -- Taiwan Plate tectonics -- Taiwan |
Issue Date: | 2010-04 |
Publisher: | Springer Nature B.V. |
Citation: | D’Amico, S., Caccamo, D., Parrillo, F., Lagana, C., & Barbieri, F. (2010). The 20th September 1999 Chi-Chi Earthquake (Taiwan): A case of study for its aftershock seismic sequence. Izvestiya. Physics of the Solid Earth, 46(4), 317-326. |
Abstract: | The purpose of this work is to highlight some methodological aspects related to the observation of possible anomalies in the temporal decay of aftershocks temporal series following a mainshock with magnitude M ≥ 7.0. In this paper we present the results for the Taiwan seismic sequence started on 20 September 1999 (M = 7.7) by tuning some seismic parameters that show considerable variations during the aftershock decay process. In here we also present the results obtained using a fractal approach for the seismic sequence. Earthquakes belong to a class of phenomena known as multifractals. In general it is important to define the fractal dimension D, but sometimes is not useful if we are describing a natural phenomenon; so it is necessary to define D ^sub 0^ called box-counting dimension and D ^sub 2^ called correlation dimension, usually D ^sub 0^ ≥ D ^sub 2^. In the elaborations of the fractal dimensions, for this sequence, we have obtained values lesser than 1, with a greater tendency of aftershocks to clusterize in time before a large aftershock. This is coherent with the possible existence of seismic anomalies, that could occur before the large aftershock. We also report the results obtained by using the delta/sigma method described firstly in [Caccamo et al., 2005] and later applied to different seismic sequence. The observed temporal series of the aftershocks per day can be considered as a sum of a deterministic and a stochastic contribution. If the decay can be modeled as a non-stationary Poissonian process, the number of aftershocks in a small time interval Δt is the mean value n(t) Δt, with a standard deviation (δ = [radical]n(t)Δt. Investigating both aftershock behavior and a wide spectrum of parameters may find the key to explain better the mechanism of seismicity as a whole. |
URI: | https://www.um.edu.mt/library/oar/handle/123456789/96697 |
Appears in Collections: | Scholarly Works - FacSciGeo |
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