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Global Differential GPS network improves efficiency of Tsunami early warning system

by Russel 2011-12-08 11:59


Tsunami GPS enabled prediction systemThe NASA Global Differential GPS is a complete, highly accurate, and extremely robust real-time GPS monitoring and augmentation system. The GDGPS System employs a large ground network of real-time reference GPS receivers, innovative cloud computing network architecture, and real-time data processing software. The Global Differential GPS System provides high positioning accuracy of 10 centimeters and sub-nanosecond time transfer accuracy anywhere in the world, on the road, on the water in the air, and in space, independent of local infrastructure. The superior quality of the system allows scientist to collect coastal GPS systems information and build a virtual model of the tsunami prediction system that quickly and accurately assesses large earthquakes and estimates the size of resulting tsunamis. The global network, managed by Jet Propulsion Laboratory combines global and regional real-time data from hundreds of GPS receiver sites and estimates their positions every second. It can detect ground motions as small as a few centimeters. Weather monitoring agencies receive timely real time updates to issue better warnings that can save lives and reduce false alarms that can unnecessarily disturb the lives of coastal residents. 

Tsunami global warning systemConventional tsunami warning systems rely on estimates of an earthquake's location, depth and magnitude to determine whether a large tsunami may be generated. GPS based predictions are verified for confirmation by NASA Space Agency altimetry satellites capable of performing real-time observations and measuring the sea surface height. Additional information is also provided by NASA Aerospace Center Gravity Recovery and Climate Experiment satellites. Coordinated effort of processing global precision GPS information, remote satellite altimetry and generating advanced Earth crust and Ocean floor computer models allows for more accurate estimate of the amount of energy the undersea earthquake transfers to the ocean generating a tsunami. Tsunami models are complex hosted within cloud computing supercomputing and data processing services. The model presumes a tsunami's power is determined by how much the seafloor is displaced vertically, and at the same time measures the horizontal motions of a faulting continental slope, resulting in three dimensional accurate computer simulation rendering parameters of tsunami with amounts of kinetic energy transferred to the ocean, along with high precision three dimensional topographic maps

buoy network of National Oceanic and Atmospheric Administration NOAAIntegration of the Global Differential GPS network, altimetry and climate experiment satellites networks of tsunami warning system with buoy network of National Oceanic and Atmospheric Administration dramatically improves the efficiency of the enhanced system. NOAA extended network of several dozen tsunami detection buoys deployed in the ocean waters, completes the buoy network and bolsters the U.S. tsunami warning system. This vast network of buoy stations provides coastal communities in the Pacific, Atlantic, Caribbean and the Gulf of Mexico with faster and more accurate tsunami warnings.

When earthquake strucks, the ground motion is captured by the closest monitoring stations of NASA Global Differential GPS network, immediately locating an earthquake's epicenter. The earthquake data becomes immediately available to the tsunami prediction center enabling processing algorithms to derive the location and amplitude of seafloor motions. Based on the GPS data the computer virtual model is updated and the system calculates the tsunami's source energy and rank. Tsunami spreads out in the ocean with a speed up to 450 miles per hour, the system takes into account kinetic energy, rank and speed along with other key parameters and indicators at a very early stage of tsunami development, which allows for immediate analysis of time between the tsunami wave generation and the first contact with the coastal line. Combination of satellite GPS along with information about the coastal topography and ground sensing methodology detects tsunami formation early enough to deliver advanced warnings allowing for effective evacuation of people with enough time to move to safer locations which are identified based on high precision topographic maps generated by the system.










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