Publication Date:
2018-03-20
Description:
In Italy, strong-motion monitoring started in the early 1970s,
when the Rete Accelerometrica Nazionale (RAN, the Italian
National Strong Motion Network; http://www.protezionecivile.
gov.it/jcms/it/ran.wp;seeData and Resources for a complete listing
of all websites listed in this article) was designed and installed
by the Agenzia Nazionale per le NuoveTecnologie, l’Energia e lo
Sviluppo Economico Sostenibile (ENEA) and ENEL (an Italian
power company). The aim was to evaluate the seismic risk in
connection with the construction of nuclear power plants. Since
1997, the RAN (Gorini et al.,2010) has been run by the Dipartimento
della Protezione Civile (DPC). At present, the RAN
includes about 500 digital strong-motion stations.
The contribution of the Istituto Nazionale di Geofisica e
Vulcanologia (INGV) to Italian strong-motion monitoring
started some years later. Through the 2004–2006 agreement
between the INGV and the DPC (Strong-Motion Stations
Project), the INGV began the phase of strong-motion monitoring
(Augliera et al., 2010, 2011). Since 2006, a complete
renewal of the (velocimetric) Rete Sismica Nazionale (RSN;
Amato and Mele, 2008) was made by installing accelerometers
to sites where broadband RSN velocimeters were already
present. Altogether, the current∼150 high-dynamics digital
strong-motion stations that cover the Italian territory constitute
the INGV strong-motion network.
The first channel chosen by the INGV to disseminate the
recorded waveforms was through the European Integrated
Data Archive (EIDA;http://eida.rm.ingv.it/;http://www.orfeus
-eu.org/eida/eida.html), a web portal devoted to seismic data
exchange that was developed in the framework of the Network
of Research Infrastructures for European Seismology (NERIES)
European project (www.neries-eu.org, Networking Activity 3
[NA3]). Since 2008, the INGV raw signals have been downloadable
in the Standard for the Exchange of Earthquake Data
(SEED) format from the continuous data archive of the INGV
National Earthquake Centre (Centro Nazionale Terremoti,
CNT). However, the EIDA web portal is devoted in particular
to expert end users, and it provides raw data without further
information about the waveform metadata and recording sites,
which is fundamental for engineering purposes.
The recorded RAN strong-motion data from 1972 to
2007 have been available to the scientific community only
through specific data requests to the DPC. This changed in
2007, when the RAN data were also disseminated online
through the ITalian ACcelerometric Archive (ITACA; Pacor
et al., 2011), a static databank that arose in the framework
of the S6 Seismological Project (Luzi et al., 2008), with the
aim of periodically (usually every 1 year) distributing highquality
corrected (i.e., manually processed by expert operators)
data to the scientific community. Now, in the last release of
ITACA version 2.0 (http://itaca.mi.ingv.it), users can find
the RAN strong-motion corrected data up to the end of 2013.
Even if the periodic publication of an updated version of
ITACA provides new data for the scientific community, within
the time span of two subsequent versions, significant earthquakes
generally shake the Italian territory. Increasing demands for
strong-motion data come from the scientific community soon
after an important earthquake, in particular, and the INGV
needed to homogeneously organize and disseminate the strongmotion
data recorded by its own stations through a new dedicated
channel. This motivated the co-operation of several INGV
Working Groups to design and develop INGV Strong-Motion
Data (ISMD), the first Italian real-time strong-motion web portal.
The main scope of the ISMD is real-time archiving,
processing, and distribution of strong-motion data recorded
by the INGV and partner networks, complete with all of
the necessary side information to correctly use the published
data. In particular, the automatic system on which the new web
portal is based can do the following:
1. check the quality of the raw accelerograms recorded by the
INGV strong-motion network;
2. archive and process the data in real time to provide rapid
estimations of the main strong-motion parameters of an
earthquake;
3. disseminate high-quality strong-motion waveforms and
related metadata in real time;
4. collect and distribute all of the available information about
the recording sites (i.e., geological, morphological, geophysical);
5. check, update, and homogenize the information related
to the INGV strong-motion stations currently installed
throughout the entire Italian territory (e.g., coordinates,
instrumentation); and
6. within minutes after an earthquake occurs, publish on the
website (http://ismd.mi.ingv.it/) a real-time report of the
event (e.g., event and waveform metadata, seismic response
of recording sites, comparisons between observed and predicted
data), jointly providing the binary–Seismic Analysis
Code (SAC) uncorrected data (i.e., the raw SEED signals,
converted into a new data format), the American Standard
Code for Information Interchange (ASCII) corrected
accelerograms (i.e., binary-SAC converted into ASCII format,
and then processed), as well as the velocity and displacement
time series and the related response spectra.
The beta version of the ISMD was published during the
May–June 2012 ML 5.9 Emilia (northern Italy) seismic
sequence. At present it has archived about 23,500 three-
component strong-motion records from∼360 Italian events
that occurred from 1 January 2012 to the present update of
15 April 2014 with an ML≥3:0
Description:
Published
Description:
863-877
Description:
4T. Sismologia, geofisica e geologia per l'ingegneria sismica
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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