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在强震发生之前,地形变异常是多种前兆异常中重现性较好的异常之一.在今后相当长的时间内,用高精度水准测量的方法来掌握地壳垂直形变,仍将是行之有效的措施.六十年代末期,我国在邢台地震试验区用短水准测量的方法预测地震初见成效,特别是辽宁省金县台用它预测1975年2月4日海城7.3(M_s)级地震的成功,使短水准观测成为预报中短期地震的前兆手段.日本目前正在进行明治以来的第七次重复测量,从水准测量的结果发现伊豆半岛东北部,从1975年前后开始出现异常隆起,这样在1978年伊豆大岛近海地震(M7.0)时,发现了几种前兆现象,这一期间频繁的大地测量,为阐明伊豆半岛
Before the occurrence of a strong earthquake, the terrain anomaly is one of the many anomalies with good reproducibility among the many precursory anomalies. It is still going to be a long time to master the vertical crustal deformation using a high-precision leveling method In the late 1960s, our country in the Xingtai earthquake test area with short leveling method to predict the initial success of the earthquake, especially in Liaoning Province, Jin County, with its forecast February 4, 1975 Haicheng 7.3 (M_s) Level earthquake has made short-range observations a precursor to the prediction of short- and medium-term earthquakes Japan is currently conducting its seventh repeat measurement since the Meiji period, and from the results of the leveling survey it has been found that northeastern Izu Peninsula began to have abnormal uplift around 1975 , So during the 1978 Izu Oshima earthquake (M7.0), several precursory phenomena were discovered. During this period, frequent geodetic surveys were conducted to clarify the situation of the Izu Peninsula