The following archives are being constructed under
the auspices of the International Committee for Preservation of WWSSN
and Historical Seismograms (ICPWHS) of the International Association
of Seismology and Physics of the Earth's (IASPEI), in collaboration with
the Data Management Center (DMC) of the Incorporated Research Institutions
for Seismology (IRIS), and the U.S. Geological Survey (USGS). The IRIS
DMC is funded by the U.S. National Science Foundation (NSF).
The main purpose of these online SeismoArchives
is to preserve seismograms and related materials
in computer data files so that they are readily accessible online as source
materials for research. For the charge and mission of this Committee,
please click: ICPWHS.
no funding is yet available for constructing these SeismoArchives, we depend
volunteers and donors of data files and/or financial support for scanning
analog seismograms that
dated back to 1882. Although the IRIS DMC has been managing modern
digital seismogram data
since the 1980s, the bulk of the seismograms recorded by seismic observatories
and networks for
over 100 years are in analog form on either papers or microfilms.
analog seismograms (about 50 millions pieces) have been disappearing at
an alarming rate.
We are now concentrating on preserving a tiny fraction of the seismograms
recorded by the
Worldwide Standardized Seismograph Network in the 1960s and 1970s (about
seismograms on 70mm film chips), and by the Historical Seismogram Filming
Project in the
1980s (about 0.5 million seismograms on microfilms for earthquakes prior
SeismoArchives are grouped into 3 major types: by
individual earthquakes, by reference stations, and by special projects.
Background materials are also included. Please click one of the following items.
I. Archives by Individual
II. Archives by Stations
III. Archives by Special
IV. Background Information
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