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    • 3. 发明授权
    • Method and system for predicting rapid motion in earth's crust on basis of electromagnetic field observation
    • 基于电磁场观测预测地壳快速运动的方法和系统
    • US06622093B1
    • 2003-09-16
    • US09671312
    • 2000-09-28
    • Yukio FujinawaHiroshi IitakaKozo Takahashi
    • Yukio FujinawaHiroshi IitakaKozo Takahashi
    • G01V100
    • G01V9/02G01V3/12Y02A90/344Y02A90/36
    • A casing pipe is inserted into a drilled hole reaching the inside of a confined aquifer in which groundwater is stored and flows or a position near the confined aquifer. A measuring device measures an electromagnetic field at the distal end of the casing pipe. An analyzing device analyzes data concerning the electromagnetic field measured by the measuring device to sense motion of ground pore water, thereby predicting rapid motion in the earth's crust, such as a volcanic eruption, an earthquake, a landslide and ground collapse. The casing pipe is an electrically conductive pipe having a non-magnetic screen portion formed at the distal end thereof so that recycling groundwater passes through the screen portion. The measuring device includes an electromagnetic field sensor placed in the screen portion and the conductive casing pipe as an electrode for measuring an electric potential relative to an electric potential at the earth's surface detected with a reference electrode.
    • 将套管插入到钻井孔中,该钻孔通向地下水储存和流动的密闭含水层的内部或靠近受限含水层的位置。 测量装置测量套管末端的电磁场。 分析装置分析由测量装置测量的电磁场的数据,以感测地孔隙水的运动,从而预测地壳中的快速运动,如火山喷发,地震,滑坡和地面崩塌。 套管是具有形成在其远端处的非磁性筛部的导电管,使得回收地下水通过筛网部分。 测量装置包括放置在屏幕部分中的电磁场传感器和作为用于测量相对于用参考电极检测的地球表面的电位的电位的电极的导电套管。
    • 4. 发明授权
    • Method of imminent earthquake prediction by observation of
electromagnetic field and system for carrying out the same
    • 通过观察电磁场和系统进行即将来临的地震预报方法
    • US5694129A
    • 1997-12-02
    • US520671
    • 1995-08-29
    • Yukio FujinawaKozo Takahashi
    • Yukio FujinawaKozo Takahashi
    • G01V1/00G01V3/12G01S13/88G01V3/38
    • G01V1/008
    • A seismic electromagnetic field signal is detected at each of observation stations installed at at least two places, and civil noise and atmospheric discharge noise are eliminated from the signal to obtain a low-frequency seismic electromagnetic field signal O.sub.s. A local characteristic signal C.sub.e and a refined local characteristic signal C.sub.f are obtained by processing the signal O.sub.s. The signals O.sub.s, C.sub.e and C.sub.f are transmitted to a central station. At the central station, a delay time T and a half-width H are obtained from the cross-correlation function between the observation stations, and further a regional characteristic signal C.sub.r is obtained from the seismic electromagnetic field signal O.sub.s. An earthquake source region distribution, an earthquake magnitude, and earthquake occurrence time are estimated on the basis of the signals obtained at the central station and the local characteristic signal C.sub.e and refined local characteristic signal C.sub.f obtained at each observation station.
    • 在安装在至少两个地方的每个观测站检测到地震电磁场信号,从信号中消除民用噪声和大气放电噪声,以获得低频地震电磁场信号。 通过处理信号Os获得局部特征信号Ce和精细局部特征信号Cf。 信号Os,Ce和Cf被传送到中心站。 在中心站,从观测站之间的互相关函数获得延迟时间T和半宽H,并且还从地震电磁场信号Os获得区域特征信号Cr。 基于在中心站获得的信号和每个观测站获得的局部特征信号Ce和精细局部特征信号C f来估计地震源区域分布,地震震级和地震发生时间。