Calder Ridge Field Station

The site

The station occupies roughly two thousand acres of open ground in Ashtabula County, near Rock Creek. The tract was assembled in the years after 1969, as the Laboratories outgrew their first field station and sought a quieter home. The first arrays came online in March 1971; continuous recording has run without interruption since.

There is little on the surface: a single low administration and analysis building, a scatter of instrument enclosures, a small residence for staff who live at distance, and the arrays themselves, which from the county road read as nothing more than fence lines and masts. The isolation is not incidental. It is the point.

Why here

A persistent signal near the threshold of detection cannot be recovered next to a city. The electromagnetic and acoustic background of an inhabited place is simply too loud. The value of Calder Ridge is measured in what it does not contain: no nearby broadcast transmitters, no high-voltage transmission corridors across the tract, and a resident population, for miles in every direction, small enough that the land at night is genuinely dark and genuinely still.

What is here

The instruments of the station are described on their own pages. In brief, the tract carries a long-baseline antenna array, a ground-resonance sensor network, and the connections to the hydrophone and remote-station networks operated elsewhere. The administration building houses the analysis room, in continuous operation since 1971, and the institute archive.

• The long-baseline antenna array
• The ground-resonance sensor network
• The signal-analysis room and operations center
• The institute archive
• Connections to the hydrophone and remote-station networks