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在新西兰威灵顿,(南纬41°14′,东经174°47′)有一台架设在地下约15米深旧隧洞中的倾斜仪,自1972年开始进行观测.安装过渡不稳定值最初为每年几个微弧度,已经缓慢地缩小到现在的每年约0.3微弧度.但如所周知的是,除非是在极深的处所,降水和蒸发因素常常完全掩盖了倾斜值与构造变动的明显关系.前此伍德和金两人曾设法研究解决这个问题,但他们所经历的最大震例仅是5.2级,因此成果并不理想.本文所介绍的新的探索则已取得了倾斜与两次或三次地震(震级由5至6.2)的明显对应关系.所对应的前兆时间与力武常次的公式也符合较好.
In Wellington, New Zealand, a tiltmeter erected in an old tunnel about 15 meters underground (latitude 41o 14 ’, longitude 174o 47’ east) has been in operation since 1972. The installation transient instability initially Several micro-radiations per year have slowly narrowed to about 0.3 micro-radians per year now, but it is well-known that precipitation and evaporation factors often completely obscure the apparent relationship between tilt and tectonic change, except at very deep locations The former Wood and Kim had managed to solve the problem, but the biggest earthquake they experienced was only 5.2, so the result was not satisfactory.The new exploration introduced in this article has been made with the tilt and the two or Three earthquakes (magnitude from 5 to 6.2) of the apparent correspondence between the corresponding precursor time and force Wu often formula is also in good agreement.