1 / 19

Ines Ivančić

NATO SfP 984374 | Improvements in the Harmonized Seismic Hazard Maps for the Western Balkan Countries . Improvement and Harmonization of BSHAP Earthquake Catalogue [ Compilation of data, comparison with SHARE-GEM catalog ]. Ines Ivančić

thea
Download Presentation

Ines Ivančić

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. NATO SfP 984374 | Improvements in the Harmonized Seismic Hazard Maps for the Western Balkan Countries Improvement and Harmonization of BSHAP Earthquake Catalogue [Compilation of data, comparison with SHARE-GEM catalog] Ines Ivančić Croatian Seismological Survey, Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb

  2. UnifiedBSHAP Earthquake CatalogueSummary on previous project - NATO SfP 983054 The BSHAP-1 catalog is compiled from: -National catalogues: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Greece, Hungary, Italy, Montenegro, Macedonia,Romania, SerbiaandSlovenia - Regional and Globalcatalogues: Karnik1996; Shebalin& Leydecker; ISC; NEIC; CMT Harvard Catalog; RCMT, INGV, Roma; RCMT, ETHZ, ZurichandEMMA database, Version 2

  3. Theinitial BSHAP-1catalogue 38.0 – 47.5 N12.5 – 24.5 E M ≥ 3.5 13342 earthquakes

  4. Improvements in the Harmonized Seismic Hazard Mapsfor the Western Balkan Countries, 2ndWorkshop, Belgrade, 24-25 April 2013 Plan for the WP1:   

  5. CATALOGUES SUBMITED FOR BSHAP-2 MONTENEGRO CROATIA SERBIA • Albania: 1964-2011, M ≥ 1.0 • Croatia: 373BC-2012, M ≥ 3.0 • Macedonia: • 479-2005, M ≥ 3.0catalogue already submitted to BSHAP-1 • 2006-2013,M ≥ 3.0taken from the officialGreek Catalogue (AristotleUniversityofThessaloniki, http://geophysics.geo.auth.gr/ss/station_index_en.html) • Montenegro: 1970-2012, M ≥ 3.0 • Serbia: 1970-2012, M ≥ 3.0 • BosniaandHerzegovina: ??? MACEDONIA ALBANIA

  6. CATALOGUES SUBMITED FOR BSHAP-2 ‘Clipped’ nationalearthquakecatalogues M≥3.0 1970 - 2012 According to the agreement: • Updatethe BSHAP-1 catalogue for 3.0≤M<3.5 earthquakes after 1970 • Mergeearthquakes occurred between 2010-2012 • … using 15 km buffer zones around national borders BosniaandHerzegovina: • missingcatalogue ? ?

  7. BosniaandHerzegovina BSHAP-1 CATALOGUE (M≥3.5): • B&H participatedwithitsnationalcatalogue BSHAP-2 • missingnationalcataloguefor events3.0≤M< 3.5 after 1970 andeventsafter 2010 BSHAP-1 M ≥ 3.5 BSHAP-1 and CEC2012 compared for events M≥3.5, inthe period 1386-2010: BSHAP-1: 504 earthquakes CEC2012: 614 earthquakes 1386 -2010 M ≥ 3.5 BSHAP-2 • AllavaliabledatafromCroatian, MontenegrinandSerbiancatalogueswerecompiled for BSHAP-2 earthquakecatalogue on theteritoryof B&H • Red dots: BSHAP-1 • Bluedots: CEC2012 • (Croatianearthquakecatalog) 1386 -2012 M ≥ 3.0

  8. FINAL SELECTION FROM THE CATALOGUES SUBMITED FOR BSHAP-1 UPDATE PROCEDURE: • Definingduplicateeventsinborderregion (15km) • RemovingeventsM < 2.4 & M ˃ 4.0 (1970 – 2012)fromnationalcatalogues • Comparingitwith BSHAP-1 PROBLEMS: • National cataloguescontain original data for all duplicateeventsresolvedin BSHAP-1 • Becauseofthepossibility to createnewduplicates, itwasofgreatimportancetodetermineeventsprevioslyresolvedin BSHAP-1 MERGING BSHAP-2 CATALOGUE

  9. DEFINING DUPLICATE EVENTS IN BORDER REGION B&H CRO MN MN • Earthquakeswithinborderregion: approx. 15 km from the both sides of the border • Finding duplicate events between neighbouring countries: Croatia – Monte Negro, Monte Negro – Serbia, Monte Negro – Albania and Serbia - Albania • Comparing duplicateswith BSHAP-1 catalogue: all events resolved in BSHAP-1catalogue were identified. • Assigningcorresponding country to the event. It was done with the use of MapInfo program and the geographical coordinates in its Europe.tab file. (Possiblediscrepancies with real border coordinates?) ALB • T ± 90 s or less? • D ± 40km or less? • Everydoubtfuleventshouldbemanuallychecked?

  10. 38.0 – 47.5 N12.5 – 24.5 E 510BC – 1969 M ≥ 3.5 1970 – 2012 M ≥ 3.0 19539 earthquakes BSHAP-2Earthquake Catalogue

  11. 39.2 – 46.6 N12.8 – 23.3 E BSHAP-2Earthquake Catalogue – estimating completeness Time distribution of seismicevents(mainshocks) by year (1970-2012) , (ML≥ 3.0) Magnitude frequency distribution of earthquakes (max.-likelihood b-value, after Gutenberg-Richterrelationship) MC ≥ 4.0(bML= –1.12) Maximum magnitude byyear:

  12. Bluedots: BSHAP-2 Red dots: BSHAP-1 BSHAP-2 Earthquake Catalogue Gap in magnitude distributionat aprox. 3.5 <M<4.0 due to irregular spatial distribution of earthquakes with magnitude M<4.0! Magnitude timeline 1970-2012, M ≥ 3.0 (Mw|ML or MLH)(19539 earthquakes) Numberofeq. peryear Magnitude distributionofmainshocksinnarrowerareaof BSHAP-2 catalogue (9698 eq): Magnitude distributionofmainshocksinnarrowerareaof BSHAP-2 catalogue (9698 eq): Magnitude distributionof all earthquakesinnarrowerareaof BSHAP-2 catalogue (9007 eq): Magnitude Count

  13. ISC-GEM Global Instrumental EarthquakeCatalogue(1900-2009), M ≥ 5.5 BSHAP-2catalogue compared to the ISC-GEM catalogue for large events for any discrepancies http://www.isc.ac.uk/iscgem/index.php 38.0 – 47.5 N12.5 – 24.5 E M ≥ 5.5 ISC-GEMcatalogue Green dots: ISC-GEM Red dots: BSHAP-2 Determinig same events: Comparing BSHAP-2 and ISC-GEM ISC-GEM BSHAP-2

  14. ISC-GEM Global Instrumental EarthquakeCatalogue(1900-2009), M ≥ 5.5 http://www.isc.ac.uk/iscgem/index.php 38.0 – 47.5 N12.5 – 24.5 E M ≥ 5.5 Green dots: ISC-GEM Red dots: BSHAP-2

  15. SHARE European Earthquake Catalogue (SHEECv3.3) 373BC –2006 Grünthal, G., Wahlström, R., Stromeyer, D. (2013), The SHARE European Earthquake Catalogue (SHEEC) for the time period 1900-2006 and its comparison to EMEC. Journal of Seismology http://www.efehr.org:8080/jetspeed/portal/hazard.psml

  16. BSHAP-2 comparison with SHARE (SHEEC) catalog BSHAP-2catalogue compared to the SHEEC catalogue (SHARE European Earthquake Catalogue (ver. 3.3)) 38.0 – 47.5 N12.5 – 24.5 E SHEEC 38.0 – 47.5 N12.5 – 24.5 E 373BC – 2006 M ≥ 3.0 6609 earthquakes BSHAPE-2 38.0 – 47.5 N12.5 – 24.5 E 510BC – 2006 M ≥ 3.0 17614 earthquakes Yellowdots: SHARE-GEM Red dots: BSHAP-2

  17. BSHAP-2 comparison with SHARE-GEM (SHEEC) catalog BSHAP-1 – SHEEC comparedmagnitude distribution Determining same events: 4052 earthquakes BSHAPE-2 SHEEC Mwu(BSHAPE)/Mw(SHARE) magnitude regression Magnitude-differencedistribution (Mwu-Mw)/Mwu(BSHAP) N M Time difference Distance difference Mwu(BSHAPE-2) -0.5≤M≤0.5 87% eq.

  18. CONCLUSION Accomplished tasks: • UpdatedBSHAP-2 catalogue with 3.0≤M<3.5 earthquakes and earthquakes occurred between 2010-2012 according to updated national earthquake catalogues • Determined duplicate events in 15 km buffer zones around national borders • UpdatedBosnia and Herzegovina earthquake catalog with all available data from Croatian, Montenegro and Serbian national catalogues Tasks to be accomplished: • Neighbors should check buffer zone updates • Declusteringand completeness check should be performed

  19. CONCLUSION Proposed tasks: • Updating BSHAP-2 catalogue with 3.0≤M<3.5 events and events occurred between 2010-2012 from neighboring countries (Italy, Slovenia, Hungary, Romania, Bulgaria and Greece) if possible • Unification of the magnitudes, especially according to new updates • Examining and filtering the BSHAP Earthquake Catalogue for missing or duplicate events And finaly providing a final earthquake catalogue compatible with international standards

More Related