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Application of SASHA for Portugal cases: mainland Portugal

Application of SASHA for Portugal cases: mainland Portugal. Carvalho A. (LNEC), Albarello D. (Un. Siena), Meroni F. (INGV) and Zonno G. (INGV). Elements used for a preliminary application evaluate the Seismic Hazard of Portugal using SASHA2.0.3. seismic catalog with Intensity Io

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Application of SASHA for Portugal cases: mainland Portugal

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  1. Application of SASHA for Portugal cases: mainland Portugal Carvalho A. (LNEC), Albarello D. (Un. Siena), Meroni F. (INGV) and Zonno G. (INGV)

  2. 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, localseismichistorieshavenotbeenconsidered

  3. 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

  4. Seismic catalogue Lisboa 1755 Distribution of seismic seismicity around Mainland Portugal, Lower Tagus Valley and Algarve

  5. Seismic catalog SHARE The seismic catalog from the European projectSHARE has been considered Only Moment Magnitude Mw >= 5.5 converted the Mw into intensity Io using the published relationship Only more about 100 events Completed the SHARE catalog with the Events used for attenuation parameters that were NOT in the SHARE catalog

  6. Seismic catalog SHARE finding the intensity I0 Used the SCR relationship to evaluate Io from Mw

  7. Attenuation distributions by courtesy Varini et al., 2013 3°General Meeting UPStrat-MAFA

  8. Attenuation distributions by courtesy Varini et al., 2013 3°General Meeting UPStrat-MAFA

  9. by courtesy Varini et al., 2013 3°General Meeting UPStrat-MAFA

  10. by courtesy Varini et al., 2013 3°General Meeting UPStrat-MAFA

  11. Example of seismic catalog input for SASHA2.0.3

  12. Previous results by Sousa and Oliveira, 2007 Basic Cornell approach

  13. Hazard evaluation Portugalby SASHA2.0.3 50 y AverageReturnTime 20 y AverageReturnTime

  14. Hazard evaluation Portugal by SASHA2.0.3 95 y AverageReturnTime Previousestimates (Sousa and Oliveira, 2007)

  15. Hazard evaluation Portugal by SASHA2.0.3 Previousestimates (Sousa and Oliveira, 2007) 475 y AverageReturnTime

  16. Hazard evaluation Portugal by SASHA2.0.3 Previousestimates (Sousa 2006) 475 y AverageReturnTime

  17. Comparison with previous results Results using the Cornell approach

  18. Comparison with SASHA outcomes

  19. Hazard evaluation Portugal by SASHA2.0.3 Deggregation Previousestimates (Sousa and Oliveira, 2007) 475 y AverageReturnTime

  20. Conclusions (very preliminary) 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

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