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Ancillary Terrestrial Component (ATC) is a U.S. Federal Communications Commission-approved [1] technique for using a "terrestrial" network of cell-phone towers to supplement a Mobile Satellite Service (MSS) provided by orbiting communications satellites. Satellite communications can be degraded by various factors, including attenuation in urban ...
Earthquake modification techniques and modern building codes are designed to prevent total destruction of buildings for earthquakes of no greater than 8.5 on the Richter Scale. [4] Although the Richter Scale is referenced, the localized shaking intensity is one of the largest factors to be considered in building resiliency.
The National Earthquake Hazards Reduction Program (NEHRP) was established in 1977 by the United States Congress as part of the Earthquake Hazards Reduction Act of 1977.The original stated purpose for NEHRP was "to reduce the risks of life and property from future Earthquakes in the United States through the establishment and maintenance of an effective earthquake hazards reduction program."
Airport operating plan AP Autopilot: A/P Airplane (US), Aeroplane (ICAO) APARS Automatic pressure altitude reporting system APC Auto pilot computer APIRS Attitude and positioning inertial reference system APOA Airport of arrival APOD Airport of departure APM Aircraft personality module APP Appendix APP Approach Control ATC APPL Application APPROX
Earthquake Hazards Reduction Act of 1977 is a statute formulating a national policy to diminish the perils of earthquakes in the United States. The Act of Congress is a declaration for an earthquake prediction system, national earthquake hazards reduction program, and seismological research studies.
In the U.S., critical infrastructure protection (CIP) is a concept that relates to the preparedness and response to serious incidents that involve the critical infrastructure of a region or the nation. The American Presidential directive PDD-63 of May 1998 set up a national program of "Critical Infrastructure Protection". [1]
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes.With better understanding of seismic demand on structures and with recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged.
According to building codes, earthquake-resistant structures are intended to withstand the largest earthquake of a certain probability that is likely to occur at their location. This means the loss of life should be minimized by preventing collapse of the buildings for rare earthquakes while the loss of the functionality should be limited for ...