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"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.Because no funding is yet available for constructing these SeismoArchives, we depend on 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.These 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 5 million 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 to 1963).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 EarthquakesThe purpose of these International Digital Earthquake Archives (IDEAs)  is to preserve earthquake data, specially seismograms, for future research.For example, Hiroo Kanamori used seismograms recorded at Debilt, the Netherlands to demonstrate that the 1960 Chile and the 1964 Alaskan earthquakes are indeed "Great Earthquakes", much larger than other "great earthquakes", such as, 1952 Kamchatka and 1963 Kurile earthquakes, 1923 Kanto and 1924 Mindanao, 2001 Peru (Pasadena), and 2001 Peru (KEV).Seismograms, data, and related materials of selected earthquakes are stored in archives as computer data files so that they are freely accessible via the Internet, and seismograms (in originally scanned resolution) are downloadable from the IRIS Data Management Center.II. Archives by StationsThese archives contain seismograms and related materials of the "Reference Stations of the World". These Reference Stations are chosen for their strategic locations and long durations in operation.III. Archives by Special ProjectsThe purpose of these archives by projects is to preserve scanned seismograms created by some special projects. The scanned image files will be searchable by some simple queries, and related materials will be available to aid the users. Seismograms will be downloadable (in originally scanned resolution) from the IRIS Data Management Center.IV. Background InformationThis section contains digital image files of papers, books, and reports that provide some useful information.1. Historical Information: Early developments in seismology, especially about instruments.2. Seismographic Stations: Lists of historical and WWSSN stations that contain detailed station information.3. Books and Reports: Some valuable out-of-print publications."Link to homepage