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Application of SASHA for Portugal cases: mainland Portugal
Carvalho A. (LNEC), Albarello D. (Un. Siena), Meroni F. (INGV) and Zonno G. (INGV)
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Elements used for a preliminary application evaluate the Seismic Hazard of Portugal using SASHA2.0.3
• seismic catalog with Intensity Io
• attenuation parameters
• SASHA2.0.3 program code
• At the moment, local seismic histories have not been considered
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Using SASHA2.0.3• completeness is accounted for
during hazard computations• no effect of uncertain
seismotectonic zoning• evetual clustering is accounted
for and no aftershock removal is required
Hazard Mapping Based on Macroseismic Data Considering the influence of Geological Conditions
By M.L. Sousa and C.S. Oliveira
Natural Hazards 14: 2007-225, 1997
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Lisboa 1755
Distribution of seismic seismicity around Mainland Portugal, Lower Tagus Valley and Algarve
Seismic catalogue
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Seismic catalog SHARE
The seismic catalog from the European project SHARE has been considered
converted the Mw into intensity Io using the published relationship
Only Moment Magnitude Mw >= 5.5
Only more about 100 events
Completed the SHARE catalog with the Events used for attenuation parameters that were NOT in the SHARE catalog
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Seismic catalog SHARE finding the intensity I0
Used the SCR relationship to evaluate Io from Mw
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by courtesy Varini et al., 2013
3°General Meeting UPStrat-MAFA
Attenuation distributions
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by courtesy Varini et al., 2013
3°General Meeting UPStrat-MAFA
Attenuation distributions
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by courtesy Varini et al., 2013
3°General Meeting UPStrat-MAFA
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by courtesy Varini et al., 2013
3°General Meeting UPStrat-MAFA
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Example of seismic catalog input for SASHA2.0.3
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Previous results by Sousa and Oliveira, 2007
Basic Cornell approach
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Hazard evaluation Portugal by SASHA2.0.3
20 y Average Return Time 50 y Average Return Time
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Hazard evaluation Portugal by SASHA2.0.3
95 y Average Return Time Previous estimates (Sousa and Oliveira, 2007)
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Hazard evaluation Portugal by SASHA2.0.3
475 y Average Return Time Previous estimates (Sousa and Oliveira, 2007)
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Hazard evaluation Portugal by SASHA2.0.3
475 y Average Return Time Previous estimates (Sousa 2006)
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Comparison with previous results
Results using the Cornell approach
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Comparison with SASHA outcomes
10 100 1000 100004
5
6
7
8
9
10
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Hazard evaluation Portugal by SASHA2.0.3
475 y Average Return Time Previous estimates (Sousa and Oliveira, 2007)
Deggregation
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The use of the SASHA code provides hazard estimates for Portugal that are significantly different from the ones provided by the standard Cornell-McGuire approach
These differences also relies on the different use of available information (seismic history, seismotectonic zoning)
The ones here illustrated just represent a first preliminary application of SASHA code: local seismic histories will be considered along with a more accurate revision of available apicentral information
Conclusions (very preliminary)