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ARCHIVING SEISMIC R/WAR DATA from ITALY and
SURROUNDING SEAS
M. Maistrello(1), G. Musacchio(1)
(gemma_at_mi.ingv.it), and C. Marcocci(2) (1)Sezione
di Milano, INGV, Italy (2) Centro Nazionale
Terremoti, INGV, Italy
Deep seismic Refraction and Wide-Angle-Reflection
(R/WAR) data is information of primary interest
for the understanding of Lithosphere formation
and evolution. In the past two decades seismic
velocity models, resulting from several deep
controlled source seismic programs, have led to
the understanding of the architecture of the
lithosphere of relevant tectonic areas. It is
getting more and more important archive the
seismic data on ready-to-use platforms for
further modeling, large syntheses and planning of
future new projects. Today, seismic data are
commonly digitally recorded and therefore easily
archived and stored with a given format. However,
paper records or analog magnetic tapes, produced
in early days of controlled source seismology
programs, are valuable data that might be lost if
a proper digitization and archiving process is
not applied. ReWARD (Refraction Wide Angle
Reflection Database) aims to assemble all the
deep seismic R/WAR data collected over Italy and
surrounding seas (23.000 km), archive them and
make them available to the scientific community.
Analog seismic records, mostly single component,
collected before 1994 are 10 of the whole
dataset and consist of about 200 profiles
(partially reversed) for about 20.000 km of total
length data. Some of these profiles were never
modeled using the modern 2D ray-tracing
techniques. They image the lithosphere at great
depths, although with a low spatial resolution
(about 21.000 waveforms). The remaining 90 of
the data cover only 3.000 km length with about
350.000 waveforms. They are 3-component,
high-resolution R/WAR digital waveforms generated
by air-gun shooting and acquired on-shore Italy.
For each study area, digital (or digitized)
waveforms will be stored with a common format.
Additional information built-in the archive will
be topographic and geologic maps, published
seismic cross-sections and references. The
archive will be published on our web-page from
which the user may retrieve on-line the built-in
information and download the data upon request.
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The DATABASE