GPS Seismometer (IMAGE) University of Washington Caption The GPS component of an advanced seismometer sits atop Radar Ridge outside Astoria, Ore. The installation is part of the Pacific Northwest Seismic Network. Credit Pacific Northwest Seismic Network Usage Restrictions News use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.