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					European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006

                    EGU06-A-07129; TS4.3-1WE2O-002



      From mapping faults to delineating
            seismogenic sources:
version 3.0 of the Database of Individual
      Seismogenic Sources (DISS)



        Roberto Basili and the DISS Working Group
                                                  Gianluca Valensise
                                                     Roberto Basili
                                                     Paola Vannoli
                                                     Sofia Mariano
                                                 Pierfrancesco Burrato

                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                                 Motivations




          Present the largest repository of data on
               Earthquake Geology in Europe

        Stimulate discussions on the peculiarities of
        the database and its application to seismic
                      hazard studies

      Encourage contributions from the community
          of European earthquake geologists



                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                     Hazards Associated with Active Faults


                                ground shaking


                              surface deformation

                                   surface rupture
 seismogenic layer




                                 INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


         Hazards Associated with Active Faults
ground shaking:             happens always but is transient
                            affects the widest area
                            is responsible for most of the damage
                            may trigger other geological effects
                            (liquefaction, landslides, secondary ruptures)


surface deformation:        happens always and is permanent
                            affects a wide area (fault size x2)
                            produce limited damage (critical facilities)
                            trigger other geological effects
                            (stream avulsion, slope instability, tsunami)


surface rupture:            happens only if fault is not blind but is permanent
                            affects a limited area (smaller than fault length)
                            may produce significant damage
                            trigger other geological effects
                            (water ponding, damming)

                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                              DISS’s History

               DISS 1.0 (2000):
               circulation limited within INGV;


               DISS 2.0 (2001):
               standalone version (MapInfo) published in
               Annali di Geofisica, with CD-ROM
               (Valensise and Pantosti, 2001);


               DISS 3.0 (2005):
               web and standalone versions, updated
               semi-annually by DISS WG.



                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                           What is DISS? (1)


   DISS is a georeferenced repository of tectonic, fault and
   paleoseismological information.

   The core objects of DISS are:

   (1) the individual seismogenic source, a simplified and three-
   dimensional representation of a fault plane. Seismogenic sources
   are assumed to exhibit "characteristic" behaviour with respect to
   rupture length/width and expected magnitude;

   (2) the seismogenic area, an elongated region containing an
   unspecified number of aligned seismogenic sources that cannot be
   singled out. Seismogenic areas are not associated with a specific
   set of earthquakes or earthquake distribution.




                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
 European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


3D View of an Individual Source and its Parameters

  Fault projection to ground surface


                              SL
                         UL

                                                                           Strike
      LL
                                                                                    SR
                                                                            UR


                                                        LR


                Fault plane                     Rake




                                                                  Dip




                                   INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
 European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


3D View of a Seismogenic Area and its Parameters
 N

        Strike min
                               polygon that encloses the projection at the
                               ground surface of an entire fault system



                                                                             N



                                                                                 Strike max
   Dip min


                  Rake max

                                                                                 Rake min
        branches of the fault system

                                                                                            Effective
                                                           Dip max                          Depth
             This is a branching point,
             NOT a segment boundary


                                       INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                               DISS content




                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


  Information behind each Seismogenic Source




                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                           What is DISS? (2)
DISS presently contains information on the Italian territory and its
surrounding regions but it’s structured to include data from anywhere.

                                                                    theme #2
        theme #1
                                thematic layers




                                  fault database




                 regional databases cropped on the fly
                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                           What is DISS? (3)

   DISS is expressly devoted to many potential applications in the
   assessment of seismic hazard at regional and national scale.



         • it represents faults in 3D

         • all its records are fully parameterized

         • it tends to completeness


   DISS content is ready to use and does not require any further
   manipulation of fault data by analysts and modelers.




                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


                             Where is DISS?




                           DISS is available online @
                           http://www.ingv.it/DISS/

                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy
European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006


Examples of earthquake geology studies, analyses
        and applications of DISS @ EGU


     See our posters on ...

     earthquake geology of NE Italy                             TS4.3     XY0933
     earthquake geology of S Italy                              TS4.3     XY0953
     earthquake geology of offshore S Italy                     TS4.3     XY0938

     regional seismotectonic view of Italy                      TS4.3     XY0944

     application of DISS to CFF analysis                        TS1.6 XY0874
     application of DISS to tsunami scenarios                   NH6.01 XY0626




     You can download this presentation from http://www.earth-prints.org/

                                INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy

				
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