摘要
2017年5月9日琉球群岛6级地震发生前,佘山地震基准台YRY-4型钻孔应变仪的2个观测分量S2、S4,在M_2波潮汐因子分析中表现出明显的趋势异常。通过实地调查排除环境、气象干扰,对应变与气压观测曲线的M_2波潮汐因子γ值进行对比及量化分析,认为应变分量观测异常非环境干扰造成,应与琉球群岛6级地震发生有关。
Before Ryukyu Islands M 6 earthquake, two observational components of YRY-4 borehole strain gauge at Sheshan observatories, S2 and S4, had obvious trend anomalies in M2 wave tide factor analysis. Based on the field investigation to exclude environment, meteorological interference analysis, comparative analysis, quantitative values of strain tide factor of M2 wave and the gamma observed value and the pressure of the tide factor of M2 wave observation that gamma, Sheshan Taiwan anomaly is not caused by interference of environment, should have genetic relationship with Ryukyu Islands M6 earthquake.
出处
《地震地磁观测与研究》
2018年第4期158-163,共6页
Seismological and Geomagnetic Observation and Research
基金
上海地震局科技专项(项目编号:2018专1)
关键词
琉球群岛地震
地震前兆
钻孔应变
干扰
earthquake in the Ryukyu Islands
earthquake precursors
borehole strain
interference
