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1918年2月13日广东南澳7 1/4级地震震中位置一直未有定论。当时虽已有地震台记录,但台站稀疏,距震区最近的徐家汇天文台有900多公里远,且当时仪器和记录的精度不高,故以有限的地震台来确定远震震中,其误差必然较大。震中附近又因大片海区而影响了宏观调查。近四十年来,先后有不同的作者分别从微观、宏观或微观与宏观相结合的方法试图给出震中位置。由于他们的工作方法不同,依据的资料不一,他们所确定的震中位置差异很大,最大差距达100公里以上(表1)。
The epicenter of the 7 1/4 quake in South Australia on February 13, 1918 has been inconclusive. At that time, although there were records of seismological stations, but the stations were sparse. The nearest Xujiahui Observatory was more than 900 kilometers away from the earthquake area. At that time, the precision of instruments and records was not high. Therefore, the limited seismographs were used to determine the teleseismic epicenter whose error Must be larger. Near the epicenter because of large areas of the sea and affected the macro survey. In the recent four decades, different authors successively tried to give the location of the epicenter from the perspectives of micro, macro or micro and macro. Because of their different working methods and the different data, the epicenters that they identified varied widely, with a maximum gap of more than 100 km (Table 1).