搜索结果: 1-15 共查到“地球科学总论 Electromagnetic”相关记录23条 . 查询时间(0.031 秒)
An Integration of Self Potential, Electromagnetic and Resistivity Profiling Methods in the Search for Sulfide Deposits in Gwoza, Borno State, Nigeria
Conductive Zones Mineralization Potentials Faults
2013/3/7
The combination of Self Potential (SP), Electromagnetic (EM) and Resistivity profiling methods in Gwoza has resulted in the delineation of conductive zones suspected to be sulfide mineralization in th...
A direction finding technique for the ULF electromagnetic source
direction finding technique ULF electromagnetic source
2009/12/14
A technique of direction finding is proposed, which can be applied to the magnetic-dipole type source located in the conductive ground. To distinguish a weak ULF source signal from the natural noise a...
Analysis of the ULF electromagnetic emission related to seismic activity, Teoloyucan geomagnetic station, 1998-2001
the ULF electromagnetic emission seismic activity Teoloyucan geomagnetic station
2009/12/14
Results of ULF geomagnetic measurements at station Teoloyucan (Central Mexico, 99.11'35.735''W, 19.44'45.100''N, 2280m height) in relation to seismic activity in the period 1998-2001 and their analysi...
Stress induced polarization currents and electromagnetic emission from rocks and ionic crystals, accompanying their deformation
polarization currents electromagnetic emission rocks ionic crystals stress
2009/12/14
A crucial question of the scientific community nowadays, concerns the existence of electric signals preceding earthquakes. In order to give a plausible answer to this question, we carried out two kind...
Experience of short term earthquake precursors with VLF–VHF electromagnetic emissions
short term earthquake precursors VLF–VHF electromagnetic emissions
2009/12/11
Electromagnetic anomalies (EMA) covering a wide range of frequencies from ULF, VLF up to VHF have been observed before recent destructive earthquakes in continental Greece. We show that the features o...
Preseismic ULF electromagnetic effect from observation at Kamchatka
Preseismic ULF electromagnetic effect observation Kamchatka
2009/12/11
Some results of ULF magnetic field observation at Karimshino site (Kamchatka, Russia) since June 2000 to September 2001 are presented here. Using case study we have found an effect of suppression of U...
Study of electromagnetic emissions associated with seismic activity in Kamchatka region
electromagnetic emissions seismic activity Kamchatka region
2009/12/9
A review of data processing of electromagnetic emission observation collected at the Complex Geophysical Observatory Karimshino (Kamchatka peninsula) during the first 5 months (July–November, 2000) of...
Estimation of reliability of seismic and electromagnetic monitoring in seismic active areas by diffraction tomography
seismic electromagnetic monitoring seismic active areas diffraction tomography
2009/12/9
This paper presents the algorithms and results of the numerical simulation of the solution of a 2-D inverse problem on the restoration of seismic parameters and electrical conductivity of local inhomo...
Inductive seismo-electromagnetic effect in relation to seismogenic ULF emission
Inductive seismo-electromagnetic effect seismogenic ULF emission
2009/12/9
During the seismic wave propagation through the crust, the electromagnetic pulse can originate due to MHD conversion in this conductive medium. On the assumption of simple models of seismic wave excit...
Electromagnetic-wave radiation due to diastrophism of magma dike growth in Izu-Miyake volcanic eruptions in Japan in 2000
Electromagnetic-wave radiation magma dike growth Izu-Miyake volcanic eruptions Japan 2000
2009/12/9
A large 10 cm per day diastrophism of the crust was experienced between Kozu and Niijima Islands during the Izu-Miyake volcanic eruptions in Japan on 3–4 August 2000. The diastrophism was detected thr...
The effect of earth tides as observed in seismo-electromagnetic precursory signals
earth tides seismo-electromagnetic precursory signals
2009/12/8
Studies on the effect of earth tides in triggering earthquakes (EQs) had a great progress in recent years, which has provided convincing evidence of earth tides in EQ triggering. On the other hand, th...
ANN-based sub-surface monitoring technique exploiting electromagnetic features extracted by GPR signals
ANN-based sub-surface monitoring technique electromagnetic features GPR signals
2010/1/28
In this work we consider the problem of determining the dielectric characteristics of sub-surface layers by means of GPR systems. In particular, a suitable electromagnetic feature (the RΓ parameter), ...
GPR based soil electromagnetic parameters determination for subsurface imaging
GPR soil electromagnetic parameters determination subsurface imaging
2010/1/28
The problem of estimating the dielectric permittivity and the electric conductivity of the soil starting from GPR measurements is addressed. A new estimation procedure is proposed and checked against ...
Detection of ULF electromagnetic emissions as a precursor to an earthquake in China with an improved polarization analysis
ULF electromagnetic emissions an earthquake an improved polarization analysis
2009/12/30
An improved analysis of polarization (as the ratio of vertical magnetic field component to the horizontal one) has been developed, and applied to the approximately four years data (from 1 March 2003 t...
Evidence of fractional-Brownian-motion-type asperity model for earthquake generation in candidate pre-seismic electromagnetic emissions
fractional-Brownian-motion-type asperity model earthquake generation candidate pre-seismic electromagnetic emissions
2009/12/30
Many aspects of earthquake generation still escape our full understanding. Observations of electromagnetic emissions preceding significant earthquakes provide one of the few cases of premonitory event...