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Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger than M 5.5 in Italy, and surrounding areas, version.

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Presentation on theme: "Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger than M 5.5 in Italy, and surrounding areas, version."— Presentation transcript:

1 Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger than M 5.5 in Italy, and surrounding areas, version 3.0 (DISS 3.0) Paola Vannoli & DISS Working Group Istituto Nazionale di Geofisica e Vulcanologia XXIX General Assembly of the European Seismological Commission - Potsdam, September 2004

2 Istituto Nazionale di Geofisica e Vulcanologia 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)

3 Istituto Nazionale di Geofisica e Vulcanologia The Database is implemented on a GIS platform open to additions and improvements and consequently it is open to additions and improvements DISS Working Group The DISS Working Group devoted the last three years to improve specific information on previously identified seismogenic sources and to implement new sources

4 Istituto Nazionale di Geofisica e Vulcanologia individual potential source The seismogenic source is the individual potential source significant earthquakes of significant earthquakes lower threshold of M 5.5 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 Basic assumptions - 1

5 Istituto Nazionale di Geofisica e Vulcanologia repeatedlyexclusively The seismogenic source generate repeatedly and exclusively largest allowed earthquake its largest allowed earthquake, according with the assumption characteristic 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: existing data - primarily, by using all existing data empirical laws - secondarily, by using empirical laws (e.g. Wells and Coppersmith, 1994) Basic assumptions - 2

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

7 Istituto Nazionale di Geofisica e Vulcanologia Examples reverse Shallow reverse fault (positively blind, depth min: 3 km) normal Shallow normal fault (potentially surface-breaking, depth min: 1 km) reverse Deep reverse fault (deeper, depth min: 15 km)

8 Istituto Nazionale di Geofisica e Vulcanologia seismogenic source Inside a seismogenic source: the Ufita Valley source ID and Name Source parameters and earthquake behaviour Authors Location of the surface projection of the source centroid

9 Istituto Nazionale di Geofisica e Vulcanologia seismogenic source Inside a seismogenic source: the Ufita Valley source Data qualifiers NEW Explanatory notes NEW Opens a child window describing surface ruptures (if any) Uncertainties NEW Open the relevant child window

10 Istituto Nazionale di Geofisica e Vulcanologia Summary Summary of the Ufita Valley source DISS 3.0 contains over 130 pages of summaries about previous relevant works on the various sources

11 Istituto Nazionale di Geofisica e Vulcanologia CommentsOpen Questions 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

12 Istituto Nazionale di Geofisica e Vulcanologia Pictures Pictures associated with the Ufita Valley source …and so on…

13 Istituto Nazionale di Geofisica e Vulcanologia References References of the Ufita Valley source DISS 3.0 contains over 1,720 selected references 470 more references than the previous version

14 Istituto Nazionale di Geofisica e Vulcanologia DISS 3.0 contains over 100 seismogenic sources DISS 2.0 sources in yellow DISS 2.0 sources in yellow DISS 3.0new or modified sources in red DISS 3.0 new or modified sources in red 40 more seismogenic sources than the previous version Significant increase

15 Istituto Nazionale di Geofisica e Vulcanologia 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

16 Istituto Nazionale di Geofisica e Vulcanologia Non-segmented source Under construction Not an individual source but an unspecified numberof aligned sources that cannot be singled out Not an individual source but an unspecified number of aligned sources that cannot be singled out

17 Istituto Nazionale di Geofisica e Vulcanologia Non-parameterized source Under construction Zone that contains an unspecified number of individual sources of unknown geometry and size

18 Istituto Nazionale di Geofisica e Vulcanologia Spatial patterns and kinematics The seismogenic sources reflect the fundamental architecture active of major active fault systems in Italy Normal faults Normal faults and regional divide Thrust faults Thrust faults and external thrusts Normal and thrust faults

19 Istituto Nazionale di Geofisica e Vulcanologia Kinematics of the seismogenic sources The seismogenic sources show the fundamental architecture active of major active fault systems in Italy Normal, thrust and strike-slip faults

20 Istituto Nazionale di Geofisica e Vulcanologia Seismogenic sources for which no historical earthquakes are known Seismic gaps?

21 Istituto Nazionale di Geofisica e Vulcanologia Spring 2005 DISS 3.0 will be completed in Spring 2005 innovative applications in SHA It is open for innovative applications in SHA European countries Simplified implementations are underway in other European countries for further info please contact: Paola Vannoli Roberto Basili Gianluca Valensise Pierfrancesco Burrato


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