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Preliminary analysis of seismograms recorded by a wide band high dynamic range digital seismograph installed under a collaborative
research programme between IPG, Paris and NGRI, Hyderabad, indicates that the crust and upper mantle structure below the Indian
continent are characterized by high velocity up to a depth of 500 km. Both the group and phase velocities in the period range
of 100–350s are found to be faster by 3–4% and 1–3% respectively compared with global models such as the preliminary reference
earth model. 相似文献
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Dileep Kumar Gupta Pradeep Kumar Ajeet Kumar Vishwakarma Prashant K. Srivastava 《国际地球制图》2018,33(6):602-611
The vegetation water content (VWC) of kidney bean crop is retrieved using ground-based multi-temporal, multi-angular and co-polarized scatterometer data at X-band. An outdoor crop-bed was prepared to observe the scatterometer response at HH- and VV-polarizations in the angular range from 20° to 70°. The trend of scattering coefficient is found to decrease for the entire angular range. The present study is carried out to investigate the retrieval for VWC of a kidney bean crop at its nine different growth stages by an empirical relation based on least square optimization method using scatterometer data. The results are found promising for the retrieval of the VWC of kidney bean crop at its several growth stages. 相似文献
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本文简要介绍了地震观测仪器的重大变革 ,数字地震仪和模拟地震仪的联系和本质区别 ,宽频带地震学的含义 ,区域数字地震台网的任务以及数字地震学的发展的现状和应用前景。目的是供从事或将要从事数字地震学观测、分析和研究的同志参考。 相似文献
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