新疆形变固体潮观测与中强地震关系的初步研究
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摘要
分析了新疆几个形变台潮汐因子的时间分布及震兆异常特征,认为震兆异常的统计关系为:异常范围随着震级的增大而增大,5级地震前可能在100km范围出现异常,5 5级左右的地震可能达250km,而8级地震的异常范围则达到1000km以上;异常持续时间与震级呈正比关系,5级地震异常持续1～5个月,6级地震3～7个月;异常幅度与值受格值影响较大,在异常判定前观测仪器的精度及环境干扰关系密切;部分台的γm2必须做相关分析。
By analyzing the time distribution of tidal factor and the anomalous characteristics of seismic precursors at several deformation stations in Xinjiang, we think the statistics relation of the precursor anomalies as followed. The range of anomalies is much bigger when the magnitude is increasing. It may be within 100 km before the earthquake with M_S5.0. It may be 250 km before one with M_S5.5.However it may be more than 1000 km before one with M_S8.0. And the duration of anomalies is direct ratio with the magnitudes. The anomalies of the earthquake with M_S5.0 last 1～5 months. However one of the earthquake with M_S6.0 lasts 3～7 months. The amplitude of anomalies is closely relative to the precision of observing instrument and the disturbance of environment. Theγ_(m_2) values of part of stations are effected very much by grid values. We have to do some correlation analyses before the anomalies are determined.
By analyzing the time distribution of tidal factor and the anomalous characteristics of seismic precursors at several deformation stations in Xinjiang, we think the statistics relation of the precursor anomalies as followed. The range of anomalies is much bigger when the magnitude is increasing. It may be within 100 km before the earthquake with M_S5.0. It may be 250 km before one with M_S5.5.However it may be more than 1000 km before one with M_S8.0. And the duration of anomalies is direct ratio with the magnitudes. The anomalies of the earthquake with M_S5.0 last 1～5 months. However one of the earthquake with M_S6.0 lasts 3～7 months. The amplitude of anomalies is closely relative to the precision of observing instrument and the disturbance of environment. Theγ_(m_2) values of part of stations are effected very much by grid values. We have to do some correlation analyses before the anomalies are determined.
引文
[1] 方 俊.固体潮[M].北京:科学出版社,1984.
[2] MelchorP,方 俊,许厚泽,等.中国固体潮观测研究[J].地球物理学报,1985,(2):142-154.
[3] 吴雪芳,陈冬生,唐九安.台站重力观测中潮汐信息与非潮汐信息的研究[A].地震预报方法实用化研究文集,形变、重力、应变专集[C].北京:地震出版社,1991,240-248.
[4] 李 平,李旭东,陈光齐,等.以倾斜固体朝振幅因子γ值判别孕震区[A].地震预报方法实用化研究文集,形变、重力、应变专集[C].北京:地震出版社,1991,25-28.
[5] 杨又陵.新疆两次MS≥5 2级地震的重力固体潮观测异常[J].内陆地震,1990,4(2):189-192.
[6] 杨又陵,蔚晓利,乌鲁木齐重力潮汐研究与震兆异常[J].内陆地震,1995,9(2):104-111.
[7] 杨又陵,裴宏达,徐道尊,等.新疆竖直摆倾仪的观测与震兆异常[J].西北地震学报,2002,24(4):340-345.
[2] MelchorP,方 俊,许厚泽,等.中国固体潮观测研究[J].地球物理学报,1985,(2):142-154.
[3] 吴雪芳,陈冬生,唐九安.台站重力观测中潮汐信息与非潮汐信息的研究[A].地震预报方法实用化研究文集,形变、重力、应变专集[C].北京:地震出版社,1991,240-248.
[4] 李 平,李旭东,陈光齐,等.以倾斜固体朝振幅因子γ值判别孕震区[A].地震预报方法实用化研究文集,形变、重力、应变专集[C].北京:地震出版社,1991,25-28.
[5] 杨又陵.新疆两次MS≥5 2级地震的重力固体潮观测异常[J].内陆地震,1990,4(2):189-192.
[6] 杨又陵,蔚晓利,乌鲁木齐重力潮汐研究与震兆异常[J].内陆地震,1995,9(2):104-111.
[7] 杨又陵,裴宏达,徐道尊,等.新疆竖直摆倾仪的观测与震兆异常[J].西北地震学报,2002,24(4):340-345.
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