INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006 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 EGU06-A-07129; TS4.3-1WE2O-002

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 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. What is DISS? (1)

INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006 Strike Dip Rake Fault plane SL LL LR UL SR UR Fault projection to ground surface Bottom depth Lenght Width Top depth Top edge Bottom edge North 3D View of an Individual Source and its Parameters

INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006 Strike min Strike max N N Dip max Rake min Rake max Effective Depth 3D View of a Seismogenic Area and its Parameters Dip min branches of the fault system This is a branching point, NOT a segment boundary polygon that encloses the projection at the ground surface of an entire fault system

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 DISS presently contains information on the Italian territory and its surrounding regions but it’s structured to include data from anywhere. What is DISS? (2) thematic layers fault database regional databases cropped on the fly theme #1 theme #2

INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006 DISS is expressly devoted to many potential applications in the assessment of seismic hazard at regional and national scale. What is DISS? (3) it represents faults in 3D it represents faults in 3D all its records are fully parameterized all its records are fully parameterized it tends to completeness 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 DISS is available Where is DISS?

INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy European Geosciences Union General Assembly 2006 Vienna, Austria, 02 – 07 April 2006 See our posters on... earthquake geology of NE ItalyTS4.3XY0933 earthquake geology of S ItalyTS4.3XY0953 earthquake geology of offshore S ItalyTS4.3XY0938 regional seismotectonic view of ItalyTS4.3XY0944 application of DISS to CFF analysisTS1.6XY0874 application of DISS to tsunami scenariosNH6.01XY0626 You can download this presentation from Examples of earthquake geology studies, analyses and applications of EGU