Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network,a data set of ...Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network,a data set of 19,140 attenuation factors t*is obtained by fitting the high-frequency attenuation of S-wave spectra with a genetic algorithm. The spatial distribution of Q_S is determined by inverting the t*data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520,and there is a significant correlation between the Q_S value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The Q_S value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains,and the high Q_S distribution is more concentrated inside the Tianshan orogenic belt. The M≥6. 0 earthquakes have been basically located in the Low-Q_S region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low Q_S exists,indicating a negative correlation. In addition,there is a positive correlation between the velocity structure and the attenuation structure in the study area,which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure.展开更多
介绍了一种S波段高功率T/R组件的研制方法和关键技术。该T/R组件包含4个通道,功能结构复杂,共有4个发射支路和12个接收支路,满足实际应用中实现多路信号的接收。12路接收信号通过3个独立的1∶4功分器合成到3个输出端口,对功分器进行仿...介绍了一种S波段高功率T/R组件的研制方法和关键技术。该T/R组件包含4个通道,功能结构复杂,共有4个发射支路和12个接收支路,满足实际应用中实现多路信号的接收。12路接收信号通过3个独立的1∶4功分器合成到3个输出端口,对功分器进行仿真优化电路。发射通道输出功率大于100 W,效率达到40%以上;12路接收通道增益平坦度和增益一致性均在1 d B以内。由于组件使用较多的裸芯片和封装器件,对工艺流程也做了简要介绍。测试结果表明,组件满足各项指标要求。展开更多
基金jointly funded by the Contract Oriented Work Task for Seismic Situation in 2017(2017010104)Science for Earthquake Resilience(XH17041Y)Fund of Earthquake Agency of Xinjiang Uygur Autonomous Region(201401)
文摘Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network,a data set of 19,140 attenuation factors t*is obtained by fitting the high-frequency attenuation of S-wave spectra with a genetic algorithm. The spatial distribution of Q_S is determined by inverting the t*data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520,and there is a significant correlation between the Q_S value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The Q_S value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains,and the high Q_S distribution is more concentrated inside the Tianshan orogenic belt. The M≥6. 0 earthquakes have been basically located in the Low-Q_S region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low Q_S exists,indicating a negative correlation. In addition,there is a positive correlation between the velocity structure and the attenuation structure in the study area,which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure.
文摘介绍了一种S波段高功率T/R组件的研制方法和关键技术。该T/R组件包含4个通道,功能结构复杂,共有4个发射支路和12个接收支路,满足实际应用中实现多路信号的接收。12路接收信号通过3个独立的1∶4功分器合成到3个输出端口,对功分器进行仿真优化电路。发射通道输出功率大于100 W,效率达到40%以上;12路接收通道增益平坦度和增益一致性均在1 d B以内。由于组件使用较多的裸芯片和封装器件,对工艺流程也做了简要介绍。测试结果表明,组件满足各项指标要求。
