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State of advancement of a new version of the Database of Potential Sources for Earthquakes

This database on a GIS platform provides information on seismogenic sources and their behavior, incorporating geological and geophysical investigations. It allows for additions and improvements and includes over 1,720 selected references.

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State of advancement of a new version of the Database of Potential Sources for Earthquakes

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  1. State of advancement of a new version of the Database of Potential Sources for Earthquakes larger than M 5.5 in Italy (Valensise and Pantosti, 2001)

  2. The Database is implemented on a GIS platform and consequently it is open to additions and improvements The DISS Working Group devoted the last three years to improve specific information on previously identified seismogenic sources and to implement new sources

  3. Basic assumptions - 1 The seismogenic source is the individual potential source of significant earthquakes A lower threshold of M 5.5 was established for the definition of an individual source The seismogenic source is identified through geological and geophysical investigations

  4. Basic assumptions - 2 • The seismogenic source generate repeatedly and exclusively • its largest allowed earthquake, according with the assumption • of the “characteristic” behaviour • (Schwartz and Coppersmith, 1984 ) • The sources are internally consistent in terms of Length/Width/Slip/Magnitude. • The source parameters are obtained: • primarily, by using all existing data • secondarily, by using empirical laws • (e.g. Wells and Coppersmith, 1994)

  5. In the GIS we represent the seismogenic source in 3D as an ideal rectangular fault plane vertical projection of the rupture plane on the surface up-dip projection of the rupture plane on the surface sense of slip of the hanging-wall (rake), represented with respect to the centre of the rupture plane NEW

  6. Examples Shallow normal fault (potentially surface-breaking, depth min: 1 km) Shallow reversefault (positively blind, depth min: 3 km) Deep reverse fault (deeper, depth min: 15 km)

  7. Inside a seismogenic source: the Ufita Valley source ID and Name Authors Location of the surface projection of the source centroid Source parameters and earthquake behaviour

  8. Inside a seismogenic source: the Ufita Valley source Explanatory notes Data qualifiers NEW NEW Open the relevant child window Uncertainties NEW Opens a child window describing surface ruptures (if any)

  9. Summary of the Ufita Valley source DISS 3.0 contains over 130 pages of summaries about previous relevant works on the various sources

  10. Comments and Open Questions on the Ufita Valley source DISS 3.0 contains over 120 pages of Comments and Open Questions, which clarify the source parameters and focus on the open problems

  11. Picturesassociated with the Ufita Valley source …and so on…

  12. References of the Ufita Valley source 470 more references than the previous version DISS 3.0 contains over 1,720 selected references

  13. DISS 3.0 contains over 100 seismogenic sources DISS 2.0 sources in yellow DISS 3.0new or modified sources in red 40 more seismogenic sources than the previous version Significant increase

  14. DISS 3.0 contains two new categories of seismogenic sources • These are aimed at: • accounting for seismogenic areas that are still poorly understood • progressing towards completeness • reducing the ambiguity between no information and no seismogenic faulting

  15. Non-segmented source Under construction Not an individual source but an unspecified numberof aligned sources that cannot be singled out

  16. Non-parameterized source Zone that contains an unspecified number of individual sources of unknown geometry and size Under construction

  17. Spatial patterns and kinematics Normal faults Normal faults and regional divide The seismogenic sources reflect the fundamental architecture of major active fault systems in Italy Thrust faults Thrust faults and external thrusts Normaland thrust faults

  18. Kinematics of the seismogenic sources The seismogenic sources show the fundamental architecture of major active fault systems in Italy Normal, thrust and strike-slipfaults

  19. Seismic gaps? Seismogenic sources for which no historical earthquakes are known

  20. DISS 3.0 will be completed in Spring 2005 It is open for innovative applications in SHA Simplified implementations are underway in other European countries for further info please contact: Paola Vannoli (vannoli@ingv.it) Roberto Basili (basili_r@ingv.it) Gianluca Valensise (valensise@ingv.it) Pierfrancesco Burrato (burrato@ingv.it)

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