Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger...

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State of advancement of a State of advancement of a new versionnew version of the of the

Database of Potential Sources for Earthquakes Database of Potential Sources for Earthquakes

larger than M 5.5 in Italylarger than M 5.5 in Italy

(Valensise and Pantosti, 2001)

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The Database is implemented on a GIS platform

and consequently it is open to additions and improvementsopen to additions and improvements

The DISS Working GroupDISS Working Group

devoted the last three years

to improve specific information

on previously identified

seismogenic sources and

to implement new sources

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The seismogenic source is the individual potential sourceindividual potential source

of significant earthquakes significant earthquakes

A lower threshold of M 5.5lower threshold of M 5.5 was established for the

definition of an individual source

The seismogenic source is identified through

geological and geophysical investigationsgeological and geophysical investigations

Basic assumptions - 1

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The seismogenic source generate repeatedlyrepeatedly and exclusivelyexclusively

its largest allowed earthquakelargest allowed earthquake, according with the assumption

of the “characteristiccharacteristic” 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 dataexisting data

- secondarily, by using empirical lawsempirical laws

(e.g. Wells and Coppersmith, 1994)

Basic assumptions - 2

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In the GIS we represent the seismogenic source in 3D as an ideal rectangular fault plane

sense of slipsense of slip of the hanging-wall (rake),

represented with respect to the centre of

the rupture plane

vertical projectionvertical projection of the rupture plane on the surface

up-dip projectionup-dip projection of the rupture plane on the surface

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Examples

Shallow reversereverse fault(positively blind, depth min: 3 km)

Shallow normalnormal fault (potentially surface-breaking, depth min: 1 km)

Deep reversereverse fault (deeper, depth min: 15 km)

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Inside a seismogenic sourceseismogenic source: the Ufita Valley source

ID and Name

Sourceparameters and

earthquake behaviour

Authors

Location of the surface projection of the source centroid

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Inside a seismogenic sourceseismogenic source: the Ufita Valley source

Dataqualifiers

Explanatorynotes

Opens a child window describing surface

ruptures (if any)

Uncertainties

Open the relevant

child window

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SummarySummary of the Ufita Valley source

DISS 3.0 contains over 130 pages of summaries about

previous relevant works on the various sources

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CommentsComments and Open QuestionsOpen 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

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PicturesPictures associated with the Ufita Valley source

…and so on…

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ReferencesReferences of the Ufita Valley source

DISS 3.0 contains over 1,720 selected references

470 more references than the previous version

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DISS 3.0 contains over 100 seismogenic sources

DISS 2.0 sources in yellowDISS 2.0 sources in yellow

DISS 3.0DISS 3.0 new or modified new or modified sources in redsources in red

40 more seismogenic sources than the previous version

Significant increase

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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

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Non-segmented sourceNon-segmented source

Under construction

Not an individual source but Not an individual source but an unspecified numberan unspecified number of of aligned sources that cannot aligned sources that cannot be singled outbe singled out

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Non-parameterized sourceNon-parameterized source

Under construction

Zone that contains Zone that contains an unspecified an unspecified

number of number of individual sources individual sources

of unknown of unknown geometry and sizegeometry and size

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Spatial patterns and kinematics

The seismogenic sources reflect

the fundamental architecture

of major activeactive fault systemsfault systems

in Italy

Normal faultsNormal faultsNormal faults and regional divideNormal faults and regional divide

Thrust faultsThrust faultsThrust faults and external thrustsThrust faults and external thrustsNormalNormal andand thrust thrust faultsfaults

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Kinematics of the seismogenic sources

The seismogenic sources show

the fundamental architecture

of major activeactive fault systemsfault systems

in Italy

NormalNormal,, thrust thrust and and strike-slipstrike-slip faultsfaults

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Seismogenic sourcesSeismogenic sources

for which no

historical earthquakes

are known

Seismic gaps?

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DISS 3.0 will be completed in Spring 2005Spring 2005It is open for innovative applications in SHAinnovative applications in SHASimplified implementations are underway in other European countriesEuropean 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)

Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger...

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