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Digital Earth oriented 3-D mapping of lithospheric structure

Chen Yuntai,Wang Chunyong and Wu Zhongliang (Institute of Geophysics,China Seismological Bureau,Beijing 100081,China)  
At present,the concept of‘Digital Earth’,which is based on the information from geodesy and remote sensing,has not considered the 3 D structure of the Earth′s interior and its temporal variation.However,such kind of information is crucial for the function of simulation and prediction within ‘Digital Earth’.In the perspective of‘Digital Earth’,the resolution of geophysical observation plays a key role.With the recent development of seismology based on the application of hightechnology,the resolution of seismological observation has been improved to a considerable extent.Broadband digital seismology has made the‘Digital Earth’oriented 3 D mapping of lithospheric structure possible.The kilometer scale observation and the annual scale monitoring as well as the integration of geophysical information into‘Digital Earth’has become a practical technique.Comparing to the meter scale resolution and the near real time monitoring function of‘Digital Earth’,there is still a difference of 3 to 4 orders of magnitudes.On the other hand,however,the geophysical information obtained in this way is unique and almost the most accurate for the Earth′s interior,and crucial for the simulation and prediction of the Earth processes.The main application of the‘Digital Earth’oriented 3 D mapping of lithosphere is to the environmental evaluation of large engineering and the prediction of natural disasters.Moreover,it also served as an information resource for the interdisciplinary studies in Earth sciences.The proposed concept of‘Digital Earth’oriented 3 D mapping of lithospheric structure is composed of three levels:(1)100 km range,10 km horizontal resolution,and 1 km vertical resolution,based on broadband mobile seismic arrays;(2)1 000 km range,100 km horizontal resolution,and 10 km vertical resolution,based on broadband digital regional seismic networks;(3)global range,1 000 km horizontal resolution,and 100 km vertical resolution,based on broadband global digital seismic network.
【CateGory Index】: P3-39
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