Istituto Nazionale di Geofisica e Vulcanologia Database of Potential Sources for Earthquakes larger...
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I s t i t u t o N a z i o n a l e d i G e o f i s i c a e I s t i t u t o N a z i o n a l e d i G e o f i s i c a e V u l c a n o l o g i a V u l c a n o l o g i a State of advancement of a State of advancement of a new version new version of of the the Database of Potential Sources for Earthquakes Database of Potential Sources for Earthquakes larger than M 5.5 in Italy larger than M 5.5 in Italy (Valensise and Pantosti, 2001)
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Transcript of 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
NEW
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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
NEW
Explanatorynotes
NEW
Opens a child window describing surface
ruptures (if any)
Uncertainties
NEW
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 ([email protected])Roberto Basili ([email protected])Gianluca Valensise ([email protected])Pierfrancesco Burrato ([email protected])
