CAJ | 학술논문

分析2014年2月12日新疆于田7.3级地震前山西地区倾斜仪、应变仪资料,发现侯马地震台水管仪、伸缩仪及临汾、太原、离石地震台水平摆不同程度地发生转向、速率变化.经对同时段观测资料差分分析得知,震前1—9天日均值差分值超出2倍中误差;谱分析表明,震前10天,在0.000 37—0.000 43 Hz、0.000 76—0.000 87 Hz频段,观测到大幅值异常信息;小波细节分析说明,多种形变仪器在64—128小时时段内观测到长周期低频率异常信号;震前20天体应变加卸载响应比大幅偏离正常值现象,恢复正常后发震.各测向在异常的起始时间有较好的准同步性.
분석2014년2월12일신강우전7.3급지진전산서지구경사의、응변의자료,발현후마지진태수관의、신축의급림분、태원、리석지진태수평파불동정도지발생전향、속솔변화.경대동시단관측자료차분분석득지,진전1—9천일균치차분치초출2배중오차;보분석표명,진전10천,재0.000 37—0.000 43 Hz、0.000 76—0.000 87 Hz빈단,관측도대폭치이상신식;소파세절분석설명,다충형변의기재64—128소시시단내관측도장주기저빈솔이상신호;진전20천체응변가사재향응비대폭편리정상치현상,회복정상후발진.각측향재이상적기시시간유교호적준동보성.
Analyzed the tiltmeterand strain gauge data in Shanxi area before the Feb.12,2014 Xinjiang Yutian M 7.3 earthquake. It is found that the different degree water pipe instrument and extensometer at Houma Seismic Station&Linfen,Taiyuanand Lishi seismic stations level shift are occur the rate of change. By analysis of the time difference of observation data, it is found that 1 - 9 days before the earthquake, the mean difference value is beyond the error 2 times. The spectrum analysis shows that, 10 days before the earthquake, in 0.000 37 - 0.000 43 Hz,0.000 76 - 0.000 87 Hz band, the observed amplitude anomaly occurred. The wavelet detail analysis indicates that a variety of deformation instrument in 64 - 128 hours observed in long cycle low frequency anomaly occurred before the earthquake signal. 20 celestial strain load unload response ratio significantly deviate from the normal phenomenon, returned to normal after the earthquake. The different components are with good quasi synchronicity at the starting time of anomaly.