International Deployment of Accelerometers

Project Description
Project IDA (International Deployment of Accelerometers) is a
global array of accelerometers that collects low-frequency
seismic data (Agnew, et. al., 1986). This network has been in
place since 1975, and has had as many as 18 stations in
operation between 1978 to 1987. The original purpose of the
network was to collect data for earth structure and earthquake
mechanisms, and it has been used to detect slow and silent
earthquakes (Beroza and Jordan, 1990). The data from 1978 to
1987 were available, although only 1984 to 1987 were considered
carefully because of the sparse global coverage in the earlier
years. The stations now have an almost uniform distribution
around the globe and respond to frequencies from about one cycle
per minute to below one cycle per day.

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