from mapping faults to delineating seismogenic sources:

INGV - Sezione di Sismologia e Tettonofisica, Roma, Italy

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

From mapping faults to delineatingFrom mapping faults to delineatingseismogenic sources:seismogenic sources:

version 3.0 of the Database of Individual version 3.0 of the Database of Individual Seismogenic Sources (DISS)Seismogenic Sources (DISS)

Roberto Basili and the Roberto Basili and the DISS Working GroupDISS Working GroupGianluca Valensise

Roberto BasiliPaola VannoliSofia Mariano

Pierfrancesco Burrato

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



MotivationsMotivations

Present the largest repository of data on Present the largest repository of data on Earthquake Geology in EuropeEarthquake Geology in Europe

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

hazard studieshazard studies

Encourage contributions from the community Encourage contributions from the community of European earthquake geologistsof European earthquake geologists



Hazards Associated with Active Faults

ground shaking

surface deformation

surface rupture

seis

mogenic

layer



Hazards Associated with Active Faults

ground shaking: happens always but is transientaffects the widest areais responsible for most of the damagemay trigger other geological effects (liquefaction, landslides, secondary ruptures)

surface deformation: happens always and is permanentaffects 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 permanentaffects a limited area (smaller than fault length)may produce significant damagetrigger other geological effects(water ponding, damming)



DISS’s HistoryDISS’s History

DISS 1.0DISS 1.0 (2000): (2000):

circulation limited within INGV;circulation limited within INGV;

DISS 2.0DISS 2.0 (2001): (2001):

standalone version (MapInfo) published in standalone version (MapInfo) published in

Annali di GeofisicaAnnali di Geofisica, with CD-ROM , with CD-ROM

(Valensise and Pantosti, 2001);(Valensise and Pantosti, 2001);

DISS 3.0DISS 3.0 (2005): (2005):

web and standalone versions, updated web and standalone versions, updated

semi-annually by DISS WG.semi-annually by DISS WG.



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)



Strike

Dip

Rake

Fault plane

SL

LL

LR

UL

SRUR

Fault projection to ground surface

Bottom depth

Lenght

Wid

th

Top depth

Top edge

Bottom edge

North

3D View of an Individual Source and its Parameters



Strike min

Strike max

N

N

Dip max

Rake min

Rake max

EffectiveDepth

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



DISS content



Information behind each Seismogenic Source



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 #1theme #2



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 3Dit represents faults in 3D

• all its records are fully parameterizedall its records are fully parameterized

• it tends to completenessit tends to completeness

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



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

Where is DISS?



See our posters on ...

earthquake geology of NE Italy TS4.3 XY0933earthquake geology of S Italy TS4.3 XY0953earthquake geology of offshore S Italy TS4.3 XY0938

regional seismotectonic view of Italy TS4.3 XY0944

application of DISS to CFF analysis TS1.6 XY0874application of DISS to tsunami scenarios NH6.01 XY0626

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

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

from mapping faults to delineating seismogenic sources:

Documents