We introduce a method of integrating Global Positioning System(GPS)and accelerometer data for high-rate seismogeodesy.This method is based on the GPS variometric approach which can obtain seismic waves in real time us...We introduce a method of integrating Global Positioning System(GPS)and accelerometer data for high-rate seismogeodesy.This method is based on the GPS variometric approach which can obtain seismic waves in real time using only the readily available broadcast products and a single receiver.Collocated 5 Hz GPS and 200 Hz accelerometer data from the 2010 M_(W) 7.2 EI Mayor-Cucapaph earthquake were analyzed to verify the effectiveness of this method.Results reveal that this method can provide broadband and more accurate displacements qualified to avoid the baseline drifting caused by strong motion.Moreover,this method can effectively avoid the aliasing problem present in the 5-Hz GPS waveforms.We therefore conclude that this method can be a powerful tool to capture seismic waves in real time,which is crucial to tsunami early warning and earthquake rapid response.展开更多
The plasma generated in the low-altitude atmosphere is of high collision frequencies. In this paper, the transmission coefficients of millimeter(MM) waves normally incident upon the plasma with high collision frequen... The plasma generated in the low-altitude atmosphere is of high collision frequencies. In this paper, the transmission coefficients of millimeter(MM) waves normally incident upon the plasma with high collision frequencies are calculated and analyzed. The experimental results of reflection and attenuation are presented for the eight-millimeter waves propagating through the plasma. Both the calculated experimental results indicate that the MM-waves concerned are attenuated significantly and reflected weakly, when propagating through the plasma of high collision frequencies.展开更多
基金supported by the National Natural Science Foundation of China (41631073)。
文摘We introduce a method of integrating Global Positioning System(GPS)and accelerometer data for high-rate seismogeodesy.This method is based on the GPS variometric approach which can obtain seismic waves in real time using only the readily available broadcast products and a single receiver.Collocated 5 Hz GPS and 200 Hz accelerometer data from the 2010 M_(W) 7.2 EI Mayor-Cucapaph earthquake were analyzed to verify the effectiveness of this method.Results reveal that this method can provide broadband and more accurate displacements qualified to avoid the baseline drifting caused by strong motion.Moreover,this method can effectively avoid the aliasing problem present in the 5-Hz GPS waveforms.We therefore conclude that this method can be a powerful tool to capture seismic waves in real time,which is crucial to tsunami early warning and earthquake rapid response.
文摘 The plasma generated in the low-altitude atmosphere is of high collision frequencies. In this paper, the transmission coefficients of millimeter(MM) waves normally incident upon the plasma with high collision frequencies are calculated and analyzed. The experimental results of reflection and attenuation are presented for the eight-millimeter waves propagating through the plasma. Both the calculated experimental results indicate that the MM-waves concerned are attenuated significantly and reflected weakly, when propagating through the plasma of high collision frequencies.
