Angeliki Adamaki
Project manager
Statistical properties of aftershock rate decay : Implications for the assessment of continuing activity
Author
Summary, in English
Aftershock rates seem to follow a power law decay, but the assessment of the aftershock frequency immediately after an earthquake, as well as during the evolution of a seismic excitation remains a demand for the imminent seismic hazard. The purpose of this work is to study the temporal distribution of triggered earthquakes in short time scales following a strong event, and thus a multiple seismic sequence was chosen for this purpose. Statistical models are applied to the 1981 Corinth Gulf sequence, comprising three strong (M = 6.7, M = 6.5, and M = 6.3) events between 24 February and 4 March. The non-homogeneous Poisson process outperforms the simple Poisson process in order to model the aftershock sequence, whereas the Weibull process is more appropriate to capture the features of the short-term behavior, but not the most proper for describing the seismicity in long term. The aftershock data defines a smooth curve of the declining rate and a long-tail theoretical model is more appropriate to fit the data than a rapidly declining exponential function, as supported by the quantitative results derived from the survival function. An autoregressive model is also applied to the seismic sequence, shedding more light on the stationarity of the time series.
Publishing year
2011-08
Language
English
Pages
748-769
Publication/Series
Acta Geophysica
Volume
59
Issue
4
Document type
Journal article
Publisher
Springer
Topic
- Geophysics
Keywords
- aftershock rate changes
- decay forecasting
- Greece
Status
Published
ISBN/ISSN/Other
- ISSN: 1895-6572