位于东京工业大学长津田校园内的精密工程学研究所在地下3米处的光学隧道中成功地测定了为期一年的长周期地面伸缩,明确了以下结果:地面的伸缩因温度变化,带有季节性变化的倾向,4月份收缩最多,而12月伸长最多。而且,除观测到由于地球潮汐的影响,28日、14日发生的周期性伸缩变化外,还能观测 The Precision Engineering Institute at the Tokyo Institute of Technology’s Nagadotsu Campus succeeded in measuring long-term ground stretching for one year in an optical tunnel at a depth of 3 meters underground, specifying the following results: Ground stretching due to temperature changes with season The trend of sexual change, the contraction in April up, while in December the largest elongation. Moreover, in addition to observed due to the impact of Earth’s tides, 28, 14, the occurrence of cyclical stretching changes, but also observed