The result displays that the horizontal steady-state vibration is little affected by vertical Chulomb damping parametric excitations.
结果表明，竖向阻尼参激对水平稳态振动的影响不大。
2
Since 1976, by using the non—dampinghorizontal pendulum tiltmeter at the range of 1.7"—5" period. we have recorded one wave anomaly signal before a series of strong earthquakes respectively.