Database of Potential Sources for Earthquakes
larger than M 5.5 in Italy
(Valensise and Pantosti, 2001)
Istituto Nazionale di Geofisica e Vulcanologia
State of advancement of a new version of the
The Database is implemented on a GIS platform
and consequently it is open to additions and improvements
Istituto Nazionale di Geofisica e Vulcanologia
The DISS Working Group
devoted the last three years
to improve specific information
on previously identified
seismogenic sources and
to implement new sources
Basic assumptions - 1
of significant earthquakes
A lower threshold of M 5.5 was established for the
definition of an individual source
The seismogenic source is identified through
geological and geophysical investigations
Istituto Nazionale di Geofisica e Vulcanologia
The seismogenic source is the individual potential source
Basic assumptions - 2
its largest allowed earthquake, according with the assumption
of the “characteristic” 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 data
- secondarily, by using empirical laws
(e.g. Wells and Coppersmith, 1994)
Istituto Nazionale di Geofisica e Vulcanologia
The seismogenic source generate repeatedly and exclusively
In the GIS we represent the seismogenic source in 3D as an
ideal rectangular fault plane
up-dip projection of the
rupture plane
on the surface
sense of slip of the
hanging-wall (rake),
represented with
respect to the centre of
the rupture plane
Istituto Nazionale di Geofisica e Vulcanologia
vertical projection of the rupture plane on the surface
Examples
Shallow normal fault
Shallow reverse fault
(positively blind, depth min: 3 km)
Deep reverse fault
(deeper, depth min: 15 km)
Istituto Nazionale di Geofisica e Vulcanologia
(potentially surface-breaking, depth min: 1 km)
Inside a seismogenic source: the Ufita Valley source
ID and Name
Location of the surface
projection of the
source centroid
Source
parameters and
earthquake
behaviour
Istituto Nazionale di Geofisica e Vulcanologia
Authors
Inside a seismogenic source: the Ufita Valley source
Explanatory
notes
Uncertainties
Opens a child window
describing surface
ruptures (if any)
Open the
relevant
child window
Istituto Nazionale di Geofisica e Vulcanologia
Data
qualifiers
Summary of the Ufita Valley source
Istituto Nazionale di Geofisica e Vulcanologia
DISS 3.0 contains over 130
pages of summaries about
previous relevant works
on the various sources
Comments and Open Questions on the Ufita Valley source
Istituto Nazionale di Geofisica e Vulcanologia
DISS 3.0 contains over 120
pages of Comments and Open
Questions, which clarify the
source parameters and focus
on the open problems
Pictures associated with the Ufita Valley source
Istituto Nazionale di Geofisica e Vulcanologia
…and so on…
References of the Ufita Valley source
Istituto Nazionale di Geofisica e Vulcanologia
DISS 3.0 contains over 1,720
selected references
DISS 3.0 contains over 100 seismogenic sources
DISS 3.0 new or modified
sources in red
Significant increase
Istituto Nazionale di Geofisica e Vulcanologia
DISS 2.0 sources in yellow
DISS 3.0 contains two new categories
of seismogenic sources
- accounting for seismogenic areas that are still
poorly understood
- progressing towards completeness
- reducing the ambiguity between no information
and no seismogenic faulting
Istituto Nazionale di Geofisica e Vulcanologia
These are aimed at:
Non-segmented source
Istituto Nazionale di Geofisica e Vulcanologia
Not an individual source but
an unspecified number of
aligned sources that cannot
be singled out
Non-parameterized source
Istituto Nazionale di Geofisica e Vulcanologia
Zone that contains
an unspecified
number of
individual sources
of unknown
geometry and size
Spatial patterns and kinematics
Thrust faults
Normal
and thrust
and external
faults thrusts
The seismogenic
sources reflect
the fundamental
architecture
of major active
fault systems
in Italy
Istituto Nazionale di Geofisica e Vulcanologia
Normal faults and regional divide
Kinematics of the seismogenic sources
Normal, thrust and strike-slip faults
Istituto Nazionale di Geofisica e Vulcanologia
The seismogenic
sources show
the fundamental
architecture
of major active
fault systems
in Italy
Seismic gaps?
Istituto Nazionale di Geofisica e Vulcanologia
Seismogenic sources
for which no
historical earthquakes
are known
DISS 3.0 will be completed in Spring 2005
It is open for innovative applications in SHA
Simplified implementations are underway in other European countries
Paola Vannoli ([email protected])
Roberto Basili ([email protected])
Gianluca Valensise ([email protected])
Pierfrancesco Burrato ([email protected])
Istituto Nazionale di Geofisica e Vulcanologia
for further info please contact: