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地震有各种前兆现象作为地震预报的一种方法,研究出反复测定地表自然Y射线分布的这一手段。将测定装置装在汽车上,边缓缓行驶,边自动测定和分析,在汽车进不去的地方,则用便携式装置。利用这些装置,围绕着认为危险的地区进行一年一次的测定,可大大提高地震预报的精度。地震预报最基本的是在于准确地捕捉前兆现象。众所周知,前兆现象种类繁多,象地应变、地倾斜,垂直运动以及地磁、地层电导率,地下水位、水质,土中气体等,在地震前均发生变化。动物异常、地声、发光现象等也属前兆现象。从前兆现象出现到主震发生这一段时间,根据经验已知地震越大这段时间越长。例如,M=3的地震前兆出现在震前5-6天,而M=7的地震前兆出现在震前4.2-15年以上。附带说一下,假设在距震源100公里的地点设置有地震仪,那么震级就是用微米单位表示地
Earthquakes have various precursory phenomena as a method of earthquake prediction and the means to repeatedly determine the natural Y-ray distribution of the earth’s surface has been developed. The measurement device installed in the car, while traveling slowly, while the automatic measurement and analysis, where the car can not go, then use portable devices. Using these devices, once-a-year measurements around areas considered dangerous can greatly enhance the accuracy of earthquake prediction. The most basic of earthquake prediction lies in precisely capturing the precursory phenomenon. It is well known that there are many kinds of precursory phenomena such as geostress, dip and vertical movement as well as changes of geomagnetism, formation conductivity, groundwater level, water quality and soil gas before earthquakes. Animal anomalies, earth tones, glowing phenomenon is also a precursor phenomenon. From the appearance of the precursor phenomenon until the mainshock occurs, the longer it is known from experience, the larger the earthquake. For example, an earthquake precursor of M = 3 occurred 5-6 days before the earthquake, while an earthquake precursor of M = 7 occurred 4.2-2.15 years before the earthquake. Incidentally, assuming that a seismograph is installed 100 km from the source, the magnitude is expressed in micrometers