During of the installation of the Plate Boundary Observatory, UNAVCO installed 79 borehole seismometers from Vancouver Island to Southern California, including Yellowstone. 74 are co-located with borehole strainmeters and five are stand alone installations. The sensors installed are Sonde-2 seismometers. This sensor uses three 2 HZ geophones in a tri-axial configuration. Eight sites in the Anza, CA region also have MEMS accelerometers. The depth of installation allows for the detection and location of microseisms that can be missed by a surface installation. The data set generated by this network has become an integral component to research being done in regional seismic networks, such as those in Anza, CA and Yellowstone National Park.