The Atwood building is instrumented from the basement to the roof with a total of 32 accelerometer sensors. The building is located just two blocks north of the Delaney Park downhole array. Together the form a richly instrumented system that records local ground motions and building response.
The complete instrumentation details are illustrated by this diagram (courtesy of the USGS).
For more information see the USGS fact sheet:
Çelebi, M., McCarthy, J., Biswas, N., Wald, L., Page, R., and Steidl, J., 2004, Seismic Monitoring of the Atwood building in Anchorage, Alaska: U.S. Geological Survey Fact Sheet 2004-3103