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在地震观测中,准确的对时十分重要。目前国内外授时台所播发的标准时间,包括两种不同的时间系统:一种是以地球自转为标准所测定的时间,并作了地球极移影响修正后的世界时UT_1时间系统;另一种是以高精度的原子时秒长为基础,与UT_1时间保持协调,偏离在±0.9秒以内的协调时UT_c时间系统。按国家地震局的规定和国际资料交换的统一需要,在地震观测中统一使用UT_c时间。目前我国的
In seismic observation, accurate timing is very important. At present, the standard time broadcast by the time-honored chimes at home and abroad includes two different time systems: one is the time determined by the rotation of the earth and the revised UT_1 time system under the influence of the polar shift of the earth; and the other It is based on a high-precision atomic-second sec- tion and is coordinated with UT_1, deviating from the UTC-time system within ± 0.9 seconds. According to the provisions of the State Seismological Bureau and the unified need of international data exchange, UT_c time is used uniformly in the earthquake observation. At present our country