Ridg-U-Rak’s Base Isolation Seismic Systems dissipate up to 85% of the seismic energy that can be exerted on a pallet rack storage system during an earthquake. The base isolation unit is positioned between the columns of an upright frame and anchored to the floor, allowing the rack structure to move. The system is designed to withstand an seismic event 25% more intense than the Northridge or Loma Prieta earthquakes which reached magnitudes of 6.7 and 6.9 on the Richter moment magnitude scale.
More seismic information is available at:
Seismic Considerations for Steel Storage Racks Located in Areas Accessible to the Public
This report FEMA 460 highlights issues for consideration in the seismic design, installation, ongoing inspection, maintenance, and use of steel single selective pallet storage racks located in areas of retail warehouse stores and other facilities accessible to the general public. Included are a review of the performance of storage racks in past earthquakes; a history of the development of codes and standards used for storage rack design and current storage rack design practices; guidance on recommended performance goals and design requirements for storage racks; guidelines for implementation/responsibilities associated with the specification, procurement, and installation of pallet storage racks; suggested guidance for securing contents; recommendations for operations and use; suggested guidance for quality assurance programs; a discussion of current and past storage rack research and testing; suggestions for post-earthquake inspections; and proposed modifications to seismic design provisions and standards for racks.
USGS - National Seismic Hazard Maps
The U.S. Geological Survey (USGS) National Seismic Hazard Maps display earthquake ground motions for various probability levels across the United States and are applied in seismic provisions of building codes, insurance rate structures, risk assessments, and other public policy. This update of the maps incorporates new findings on earthquake ground shaking, faults, seismicity, and geodesy. The resulting maps are derived from seismic hazard curves calculated on a grid of sites across the United States that describe the frequency of exceeding a set of ground motions.
Earthquake Scenarios describe the expected ground motions and effects of specific hypothetical large earthquakes. In planning and coordinating emergency response, utilities, emergency responders, and other agencies are best served by conducting training exercises based on realistic earthquake situations, ones that they are most likely to face. Scenario earthquakes can fill this role; they can be generated for any potential hypothetical future or past historic earthquake.