scholarly journals Study of the seismicity temporal variation for the current seismic hazard evaluation in Val d'Agri, Italy

2014 ◽  
Vol 14 (12) ◽  
pp. 3169-3174 ◽  
Author(s):  
I. Baskoutas ◽  
A. D'Alessandro
Keyword(s):  
Time Series ◽  
Seismic Hazard ◽  
Temporal Variation ◽  
High Probability ◽  
Seismic Energy ◽  
B Value ◽  
Hazard Evaluation ◽  
Magnitude Distribution ◽  
Seismicity Pattern ◽  
Seismic Hazard Evaluation

Abstract. This study examines the temporal variation of the seismicity in the Val d'Agri (southern Italy) and adjacent areas, for the current seismic hazard evaluation. The temporal variation of the seismicity is expressed as time series of the number of earthquakes, b value of Gutenberg–Richter relationship or b value of the frequency–magnitude distribution and the seismic energy released in the form of logE2/3. The analysis was performed by means of a new research tool that includes visualizing techniques, which helps the interactive exploration and the interpretation of temporal variation changes. The obtained time series show a precursory seismicity pattern, characterized by low and high probability periods, which preceded earthquakes of magnitude M ≥ 4.0. The 75% of the examined cases were successfully correlated with a change in seismicity pattern. The average duration of the low and the high probability periods is 10.6 and 13.8 months respectively. These results indicate that the seismicity temporal variation monitoring in a given area and the recognition of the low and high probability periods can contribute to the evaluation, in regular monthly intervals, of current seismic hazard status.

scholarly journals Study of the seismicity temporal variation for the current seismic hazard evaluation in Val d'Agri, Italy

2014 ◽  
Vol 2 (6) ◽  
pp. 4421-4438
Author(s):  
I. Baskoutas ◽  
G. A. Papadopoulos ◽  
A. D'Alessandro
Keyword(s):  
Time Series ◽  
Seismic Hazard ◽  
Temporal Variation ◽  
High Probability ◽  
Seismic Energy ◽  
Current Status ◽  
Hazard Evaluation ◽  
Magnitude Distribution ◽  
Seismicity Pattern ◽  
Seismic Hazard Evaluation

Abstract. This study examines the temporal variation of the seismicity in the Val d'Agri (Southern Italy) and adjacent areas, for the current seismic hazard evaluation. The temporal variation of the seismicity is expressed as time series of the number of earthquakes, the b value of the frequency magnitude distribution of Gutenberg-Richter relationship and the seismic energy released in the form of log E2/3. The analysis was performed by the means of a new research tool that includes visualizing techniques, which helps the interactive exploration and the interpretation of temporal variation changes. The obtained time series show a precursory seismicity pattern, characterized by low and high, probability periods, which preceded earthquakes of magnitude M ≥ 4.0. 75% of the examined cases were successfully correlated and 25 of them resulted false. The average duration of the low and the high probability periods is 10.6 and 13.8 months long respectively. These results indicate that the seismicity temporal variation monitoring in given area and the recognition of the low and high probability periods, can contribute to the evaluation, in regular monthly intervals, of the current status seismic hazard.

Seismic Hazard Evaluation Using Markov Chains: Application to the Japan Area

2005 ◽  
Vol 162 (6-7) ◽  
pp. 1347-1366 ◽  
Author(s):  
F. Alejandro Nava ◽  
Claudia Herrera ◽  
José Frez ◽  
Ewa Glowacka
Keyword(s):  
Markov Chains ◽  
Seismic Hazard ◽  
Hazard Evaluation ◽  
Seismic Hazard Evaluation

Updated seismotectonic zoning scheme of Metropolitan France, with reference to geologic and seismotectonic data

2013 ◽  
Vol 184 (3) ◽  
pp. 225-259 ◽  
Author(s):  
Stéphane Baize ◽  
Edward Marc Cushing ◽  
Francis Lemeille ◽  
Hervé Jomard
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Active Faults ◽  
Seismic Hazard Assessment ◽  
Tectonic Activity ◽  
Hazard Evaluation ◽  
Boundary Location ◽  
Seismotectonic Zones ◽  
Seismic Hazard Evaluation ◽  
Surface Geology

Abstract This work presents the seismotectonic zoning scheme of Metropolitan France developed by the IRSN (French Institute for Radioprotection and Nuclear Safety) within the framework of its seismic hazard assessment activities. It is the outcome of many years of work following the publication of the “seismotectonic atlas” in 1993 [Grellet et al., 1993]. This scheme supports the assessment of seismic hazard by IRSN. It takes into account the most recent data concerning the deep and surface geology, as well as those related to seismotectonics and tectonic activity. It finally includes 67 surface seismotectonic zones (STZ), as well as a catalogue of 74 faults or structures (named hereafter “potential active faults”) for which indications of Neogene to Quaternary displacement can be inferred. The description of the zoning scheme comes along with an estimation of the uncertainty on the boundary location between adjacent STZ. We also qualitatively determine a “relevance order” for each limit, so as to illustrate their reliability to separate regions of different seismogenic potential. Also, we attributed to the faults an indication whose purpose is to reflect the recent character of their activity, and thus their seismotectonic potential. This assessment of uncertainties was undertaken to better integrate the zoning scheme in the general approach, which arises from recent studies, namely the propagation of the uncertainties in seismic hazard evaluation, whether deterministic or probabilistic.

scholarly journals New tool for the spatio-temporal variation analysis of seismic parameters

2009 ◽  
Vol 9 (3) ◽  
pp. 859-864 ◽  
Author(s):  
G. A. Papadopoulos ◽  
I. Baskoutas
Keyword(s):  
Temporal Variation ◽  
Seismic Energy ◽  
B Value ◽  
Research Tool ◽  
Earthquake Activity ◽  
Seismic Parameters ◽  
Mean Values ◽  
Seismicity Parameters ◽  
Spatio Temporal ◽  
New Research

Abstract. In this paper a new research tool called FastBEE (Fast Estimation of Expected Big Earthquake) is proposed, for the analysis of three basic seismic parameters, (the number of earthquakes N, b-value, and the seismic energy released in the form logE2/3), in order to examine their spatio-temporal variation behavior. The developed research tool is suited to analyze earthquake catalogs and it comprise new interactive visualization techniques for the exploration of the results. The tool was tested in several seismic active areas of the Hellenic territory and a case study of its applicability is presented. It is observed that the results of the seismicity parameters analysis show a clear temporal fluctuation, with respect to their mean values. Such a behavior can be interpreted as the result of the geodynamic process acting in the region. In several cases the observed significant changes can be related to strong earthquakes, so that they can be considered as precursor indicating the preparation stage for an impending strong earthquake activity.

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