1 / 16

Application of SASHA for the Icelandic case Vera D’Amico 1 , Dario Albarello 2 ,

Application of SASHA for the Icelandic case Vera D’Amico 1 , Dario Albarello 2 , Ragnar Sigbjörnsson 3 , Rajesh Rupakhety 3 1 Istituto Nazionale di Geofisica e Vulcanologia, Milano, Italy 2 Dip . Scienze Fisiche, della Terra e dell’Ambiente, University of Siena, Italy

aaralyn
Télécharger la présentation

Application of SASHA for the Icelandic case Vera D’Amico 1 , Dario Albarello 2 ,

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Application of SASHA for the Icelandic case Vera D’Amico1, Dario Albarello2, Ragnar Sigbjörnsson3,Rajesh Rupakhety3 1 Istituto Nazionale di Geofisica e Vulcanologia, Milano, Italy 2 Dip. Scienze Fisiche, della Terra e dell’Ambiente, Universityof Siena, Italy 3 Earthquake Engineering Research Centre, University of Iceland, Selfoss, Iceland

  2. SASHA code Step 1 Step 2

  3. Input elements used for Iceland • Earthquake catalogue listing magnitude and epicentral intensity • The SHareEuropean Earthquake Catalogue (SHEEC) released by the EU project SHARE • Attenuation model to estimate seismic effects at the site (expressed in terms of probabilities of exceedence of different intensity values) from epicentral information (epicentral intensity and epicentral distance) • The probabilistic attenuation model developed in Task B with the empirical parameters assessed for Iceland

  4. Earthquakecatalogue Earthquakesextractedfrom SHareEuropean Earthquake Catalogue (SHEEC) releasedby the EU project SHARE

  5. Earthquakecatalogue Toapply the attenuationmodelof Task B, epicentralintensity I0isrequiredforeachearthquakeof the catalogue A preliminaryroughempirical relation wasderivedfrom the sameeventsusedto calibrate the attenuationmodel (these are the onlyeventsforwhichan estimate of I0isavailable!)

  6. Earthquakecatalogue I0derived fromMw (timeperiod: 1706-2008)

  7. Attenuationmodel by courtesy of Varini et al., 2013

  8. Attenuationmodel by courtesy of Varini et al., 2013

  9. Hazardcomputation Hazardhasbeencomputedover a regular grid (1680 nodes) coveringwhole Iceland for4 exceedenceprobabilitiesforanexposuretimeof 50 years, equivalenttoaveragereturntimes (ART) of 50, 200, 475, 975 years For 4 selectedlocalities, furtherARTshavebeenexamined and hazarddeaggregationperformed

  10. ART=200 (p.e. 22% in 50yr) ART=50 (p.e. 63% in 50yr) ART=975 (p.e. 5% in 50yr) ART=475 (p.e. 10% in 50yr)

  11. Hazardcurves ART=475 (p.e. 10% in 50yr) Hazardcurves Iref

  12. Hazarddeaggregation ART=475 (p.e. 10% in 50yr) Iref=8 Distance (km) Magnitude

  13. Hazarddeaggregation ART=475 (p.e. 10% in 50yr) Iref=8 Distance (km) Magnitude

  14. Hazarddeaggregation ART=475 (p.e. 10% in 50yr) Iref=8 Distance (km) Magnitude

  15. Hazarddeaggregation ART=475 (p.e. 10% in 50yr) Iref=7 Distance (km) Magnitude

  16. Comparisonwithprevious PSHA RT=475 (p.e. 10% in 50yr) PGA ART=475 (p.e. 10% in 50yr) Just for qualitative comparison, becauseofdifferentshakingmeasure (Intensity vs. PGA), different PSH methodology (SASHA vs. standard Cornell’s approach), different input data (catalogue, attenuation relation,…)

More Related