High latitude power system testing facility.

SJG is located at the U.S.Geological Survey Observatory San Juan, near Cayey, in south-central Puerto Rico.

A broadband seismometer located at the Newport Geophysical Observatory run by the U.S. Geological Survey, northwest of the town of Newport, WA.

The seismometer at QSPA is installed in a 300m deep borehole drilled into the ice at the South Pole Remote Earth Science and Seismology Observatory.

The seismometer at ELK is installed in a granite tunnel in the Ruby Mountains approximately 28 miles from the town of Elko, NV.

There are two broadband seismometers located at Eareckson Air Station on Shemya Island.

A single broadband seismometer located on the Isleta Pueblo reservation in the high desert of New Mexico.

A single broadband seismometer located at the US Coastguard Station on Kodiak Island

A single broadband seismometer located in an abandoned mine in Klamath National Forest.

A single broadband seismometer at the University of California San Diego’s Piñon Flat Observatory in southern California.

A single broadband seismometer located within the Tuckaleechee Caverns in the town of Townsend, TN.

PMSA is installed in corrugated steel building at Palmer Station on the Antarctica Peninsula.

The GUMO seismic station is located near the north coast of the island of Guam.

A 12-station seismic array near the town of Mina, NV.

An 8-element array that is used for testing infrasound and seismic instrumentation.

A 6-element infrasound array located 9 miles northwest of the town of Dillingham, in western Alaska’s Bristol Bay region.

An 8 element infrasound spread over the 3 islands that form the Wake Island Atoll

A 4-element infrasound array close to the city of Kona on the western side of the Big Island of Hawaii.

A 4-element infrasound array located on Sand Island of Midway Atoll.

An 8-element infrasound array located at the University of California San Diego’s Piñon Flat Observatory in southern California.

A 4-element infrasound array located at the Newport Geophysical Observatory run by the U.S. Geological Survey, northwest of the town of Newport, WA.

An 8-element infrasound array located on the Ross Ice Shelf, south of Ross Island.

A 7-element infrasound array on Diego Garcia, the southernmost island of the Chagos Archipelago in the Indian Ocean.

An 8-element infrasound array located on the campus of the University of Alaska Fairbanks.