It is a part of a nationwide network. There are 144 stations in the regional network. Some sites have individual formal land-use agreements with the UW, other sites are covered by agreements with PNSN's funding agencies. Agreements generally include the right to maintain equipment on the site and the support of access. Some site fees are paid.
Most sites consist of seismic monitoring equipment with little human presence.
The network is dynamic and changes somewhat from year to year. Location Washington and Oregon. A typical simple site would include one seismometer, a power source, and transmitter. These upgraded sites are usually sheltered in sheds. Washington Dept. of Parks and Recreation, Weyerhaeuser, other private owners.