南极短周期密集地震台阵观测及应用研究进展OA

The Antarctic ice sheet and its underlying geological structures provide a crucial basis for understanding ice-sheet evolution,sea-level change and solid Earth dynamic processes.Owing to extreme environmental conditions,high observational costs and logistical constraints,conventional geophysical methods still face clear limitations in local high-resolution investigations in Antarctica.In recent years,short-period dense seismic arrays have gradually become an important technique for fine-scale Antarctic exploration because of their flexible deployment,high spatial sampling density and strong capability for recording high-frequency signals.Existing studies show that such arrays have made substantial advances in shallow ice-sheet structure imaging,icequake monitoring,classification and location,local tectonic detection,and ice-flow velocity estimation.For shallow structural studies,ambient noise cross-correlation and surface-wave dispersion inversion can provide relatively high-resolution constraints on ice thickness,firn structure and the ice sheet-bed interface.In ice-sheet environments,the H/V spectral ratio mainly reflects ice thickness and impedance contrasts across the ice sheet-bed interface,and can therefore serve as an auxiliary criterion in integrated interpretation.For icequake studies,the combination of unsupervised deep learning and array processing enables automatic identification and classification of icequake events,as well as analysis of their environmental modulation mechanisms.For local tectonic studies,joint use of short-period dense arrays with broadband seismic,magnetotelluric and other datasets can provide refined constraints on key tectonic boundaries and deep interfaces.In addition,GPS data embedded in seismic stations indicate the potential of these arrays as multi-parameter integrated observation platforms.Overall,short-period dense seismic arrays do not replace broadband seismic networks,but instead provide an important complement for local high-resolution Antarctic investigations.Future work should further improve long-term continuous observation,standardization of data-processing workflows,robustness of intelligent event recognition,and multi-physics joint constraints,thereby promoting their broader application in studies of ice sheet-solid Earth coupling.