Digitization of the Carnegie Analog Broadband Instruments Tape Records (1965-1996)

Between 1965 and 2003, the Carnegie Institution of Washington's Department of Terrestrial Magnetism operated a continuous network of nine broadband seismographs with locations in South America, Japan, Iceland, Papua New Guinea, and Washington, D.C. The Carnegie seismographs designed in the 1960s by Selwyn Sacks were among the earliest broadband instruments, sensing between at least 30 s and similar to 30 Hz. Given the scarcity of historic seismic data of comparable bandwidth and dynamic range prior to the widespread shift to force-feedback instruments and digital recording around the mid-1980s, this dataset is still of high scientific value today.