USGS Hawaiian Volcano Observatory historical seismograms

Boxes of historical seismograms (thousands of them!) in the basement of the USGS Hawaiian Volcano Observatory in the summer of 2017. These records span over a century of earthquake monitoring in Hawaii. Dr. Thomas Jaggar installed the first seismometer in 1912, and paper records were used for recording into the 1990s. Seismic recording over a network of digital seismic instruments continues today.  After the 2018 eruption, all the archival records were moved. Most are now at the National Archives, though a few are still on-island. USGS photo.