GEM Global Earthquake History; Albini [dec 2012]

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One of GEM's global projects, carried out by experts from INGV and BGS, in collaboration with historical earthquake experts from around the globe.

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GEM Global Earthquake History; Albini [dec 2012]

  1. 1. Tools for compiling theGlobal Earthquake HistoryPaola Albini1 | Roger M.W. Musson2 |Antonio A. Gomez Capera1 | Mario Locati1 | Andrea Rovida1 |Massimiliano Stucchi1 | Daniele Viganò1 |1 Istituto Nazionale di Geofisica e Vulcanologia, INGV, Milano, Italy2 British Geological Survey, BGS, Edinburgh, UK
  2. 2. Global Earthquake History: the project‣ Three main goals: ‒ Global Historical Earthquake Archive-GHEA ‒ Global Large Historical Earthquake Catalogue-GLHECAT ‒ IT Infrastructure and website‣ Fulfilled by establishing an innovative set of methodological and technological tools‣ Time coverage: 1000-1903‣ Magnitude range : ≥7 (at the outset of the project)
  3. 3. Global Earthquake History: the project (cont) Study A Study B Study C Study D Earthquake 1 Earthquake 2 Global Historical Earthquake Archive Selection criteria Global Large Historical Earthquake Catalogue
  4. 4. The Global Historical Earthquake Archive - GHEAOverall goal in compiling the Global Historical EarthquakeArchive:‣ To identify, collect and critically organise the best and most recent information available for earthquakes in the time- window 1000-1903 and magnitude equal to or higher than 7‣ Information not from primary sources, but from published material, such as: ‒ Papers, reports, and volumes ‒ Sets of Macroseismic Data Points ‒ Parametric Catalogues
  5. 5. GHE Archive: from Studies to Records-1833 Nyalam eq Szeliga et al., 2010 Martin & Szeliga, 2010 Bilham, 1995Ambraseys & Douglas, 2004 Bhatia et al., 1999
  6. 6. GHE Archive: from Studies to Records-1833 Nyalam eq China SSB & FU, 1990b Min Ziqun, 1995
  7. 7. GHE Archive: from Studies to Records-1833 Nyalam eq• M values range from 7.6 to 8.0• Epicentral location varies considerably• The solution by the Chinese catalogue, Min Ziqun, 1995 (highlight in yellow) is adopted• NB: in bordering areas the comprehensive vision of the GEH Archive can suggest new insights
  8. 8. GHE Archive and Number of Records per Earthquake Multiplicity of Studies for each Earthquake
  9. 9. GHE Archive in NumbersThe Archive contains:‣ 236 studies ‣ critically analysed and inventoried ‣ selected (thousands of pages scanned)‣ 994 earthquakes‣ 3,154 records compiled (in the database underlying the Archive)‣ 17 fakes
  10. 10. GHE Archive in Numbers (cont)The Archive contains also:‣ 77 studies in the Archive containing Macroseismic Data Points‣ 12, 282 Macroseismic Data Points re-compiled from 69 studies for a total of 292 (out of 994) earthquakes
  11. 11. GHE Archive and Number of Macroseismic Data Points 292 earthquakes with 12,582 macroseismic data
  12. 12. The Global Large Historical Earthquake Catalogue - GLHECATOverall goal in compiling the Catalogue:‣ The material upon which GLHE Catalogue is built is supplied by the GHE Archive, selected because of ‒ public availability ‒ clarity and reliability‣ The Archive content was analysed on a region-by-region and in most cases an earthquake-by-earthquake basis‣ The Catalogue results from comparing the sets of parameters available for each earthquake and selecting the best-attested (checked against the studies and their data)
  13. 13. GLHE Catalogue in NumbersThe Catalogue contains:‣ 827 earthquakes (out of 994 in the GHE Archive)‣ 110 earthquakes with M<7 (mostly in intraplate areas)‣ 167 earthquakes not included (a magnitude <7 was assigned)‣ 92 studies (out of the 236 archived) supplying the parameters
  14. 14. GLHE Catalogue in Time 32 earthquakes
  15. 15. GLHE Catalogue in Time 37 earthquakes
  16. 16. GLHE Catalogue in Time 101 earthquakes
  17. 17. GLHE Catalogue in Time 132 earthquakes
  18. 18. GLHE Catalogue in Time 209 earthquakes
  19. 19. GLHE Catalogue in Time 316 earthquakes
  20. 20. GLHE Catalogue in Time 1000-1903 827 earthquakes
  21. 21. NOAA Catalogue 1000-1903 and M≥7 371 earthquakes
  22. 22. GLHE Catalogue 1000-1903 M≥7 717 earthquakes
  23. 23. GLHE Catalogue vs NOAA Catalogue, Himalayas (1) 11 eqs in NOAA Catalogue vs 20 eqs in GLHE Catalogue
  24. 24. GLHE Catalogue vs NOAA Catalogue, Himalayas (2) Differences in location
  25. 25. GLHE Catalogue vs NOAA Catalogue, Himalayas (3) Comparison between Magnitudes
  26. 26. GLHE Catalogue vs NOAA Catalogue, IndonesiaNOAA Catalogue: 6 earthquakes GLHE Catalogue: 75 earthquakes
  27. 27. The IT Infrastructure and Website: accessing the Archive
  28. 28. Accessing the Archive (cont)The archive is accessed by means of a website where a two depthlevel approach has been implemented:‣ a general view with the list of all earthquakes‣ a detailed view with all the archived items on an earthquake
  29. 29. Global Earthquake History Study A Study B Study C Study D Earthquake 1 Earthquake 2 Global Historical Earthquake Archive Selection criteria Global Large Historical Earthquake Catalogue
  30. 30. Global Earthquake History: an “alive and kicking” Archive‣ The Global Historical Earthquake Archive provides a complete (so far as is possible) account of the global situation in historical seismology, with all existing studies collected together in a syncretic way, retrievable either by earthquake or region.‣ The Global Large Historical Earthquake Catalogue is the best global historical catalogue of large earthquakes presently available with the best parameters selected, duplications and fakes removed, and new earthquakes discovered.‣ The full title of the project is “Tools for compiling a Global Earthquake History”: the history itself is not yet fully written, and, as should be clear, much writing remains to be done.

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