搜索结果: 1-9 共查到“地球物理学 VLF”相关记录9条 . 查询时间(0.078 秒)
Evolution of magnetotelluric,total magnetic field,and VLF field parameters in Central Italy:relations to local seismic activity
Magnetotelluroc tectonomagnetism VLF waves
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2015/9/28
Magnetotelluric data were collected at Collemeluccio (41.72°N, 14.37°E) in Central Italy from summer 1991 to spring 1998. Analyzed by means of tensor decomposition on the geoelectric potential and rob...
Tectonomagnetic and VLF electromagnetic signals in Central Italy
tectonomagnetism seismomagneticnetwork seismic activity VLF
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2015/9/14
Tectonomagnetic field observations from absolute magnetic field level measurements were undertaken in Central Italy in an area extending between latitude 41°N and 43°N and between longitude 13°E and 1...
Ionospheric perturbations associated with two huge earthquakes in Japan, using principal component analysis for multiple subionospheric VLF/LF propagation paths
Ionospheric perturbations Earthquakes Subionospheric VLF/LF propagation
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2015/8/24
The presence of ionospheric perturbations in possible association with two huge earthquakes (Noto-hanto peninsula and Niigata-chuetu-oki earthquakes) in 2007 was studied on the basis of a conventional...
VLF-EM and VES: an application to groundwater exploration in a Precambrian basement terrain SW Nigeria
Electromagnetic (VLF-EM) Hard rock environment Groundwater development Layer resistivity Bed thickness mappingss mapping
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2015/8/17
In a hard rock environment with surface or near surface expression of outcrops, the use of VES only becomes difficult due to its associated problems and limitations. However, the use of VLF-EM becomes...
电离层人工调制激发的下行ELF/VLF波辐射
电离层人工调制 ELF/VLF波辐射 全波解 HAARP实验
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2011/11/22
通过大功率ELF/VLF调幅高频波对电离层进行加热,形成电离层虚拟天线,可以作为发射ELF/VLF波的一种有效手段.本文使用汪枫(2009)的调制加热模型,计算高频加热电离层产生的低频辐射源强度,采用全波解算法分析辐射的低频波向下传播过程中的衰减和反射问题,并采用HAARP实验参数,模拟出在海面上接收到的低频信号强度为PT量级,与实验数据一致.模拟结果表明,加热泵波功率、低频调制波频率、以及加热纬...
电离层人工调制激发的下行ELF/VLF波辐射
电离层人工调制 ELF/VLF波辐射 全波解 HAARP实验
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2011/11/9
通过大功率ELF/VLF调幅高频波对电离层进行加热,形成电离层虚拟天线,可以作为发射ELF/VLF波的一种有效手段.本文使用汪枫(2009)的调制加热模型,计算高频加热电离层产生的低频辐射源强度,采用全波解算法分析辐射的低频波向下传播过程中的衰减和反射问题,并采用HAARP实验参数,模拟出在海面上接收到的低频信号强度为PT量级,与实验数据一致.模拟结果表明,加热泵波功率、低频调制波频率、以及加热纬...
Decrease of VLF transmitter signal and Chorus-whistler waves before l'Aquila earthquake occurrence
Decrease of VLF transmitter signal Chorus-whistler waves l'Aquila earthquake occurrence
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2010/10/21
We investigate the VLF emissions observed by the Instrument Champ Electrique (ICE) experiment onboard the DEMETER micro-satellite. We analyze intensity level variation 10 days before and after the occ...
本文利用搭载在DEMETER卫星上的感应式磁力仪(Instrument Magnetometer Search-Coil, IMSC)探测数据分析了磁场甚低频(Very Low Frequency, VLF)波功率谱的空间分布.在排除地磁扰动影响(Dst≤-30 nT,Kp≥3,AE≥200 nT)的前提下,我们给出2007年不同季节,日侧和夜侧,磁场VLF波功率谱的全球分布的背景场探测和对应的统...