ANSS 2
ANSS 2 : Advanced National Seismic System. ANSS is an activity of the U.S. Geological Survey (USGS) for a nationwide network of several thousand shaking measurement systems, both on the ground and in buildings, to provide emergency responders with real-time earthquake information, engineers with information about building and site response, and scientists with high-quality data to understand earthquake processes and solid earth structure and dynamics. Several agencies in California have formed the California Integrated Seismic Network (CISN) as a region of ANSS