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本文简要地叙述了选频脉动测量仪的基本原理和特性。利用低通和带通数字滤波器,分别对脉动、风速和气压等资料进行了处理。结果表明,脉动与局部气象条件的相关性不大;唐山7.8级地震前不久,离震中不远的昌黎台(△=80公里)记录到的脉动幅值急剧减小;在几次强余震(M≥6.0)前,脉动幅值经历较长时间(数月)的偏低过程,而临震前变化不明显。结合唐山地震前,邻近震中地区地温(80厘米深)的时、空分布特征,讨论了它们与唐山地震孕震过程的可能联系。
This article briefly describes the basic principles and characteristics of frequency-selective pulsation gauges. Using low-pass and band-pass digital filters, respectively, pulsation, wind speed and pressure and other data were processed. The results show that there is not much correlation between pulsation and local weather conditions. Shortly before the MS 7.8 Tangshan earthquake, the pulsation amplitude recorded by Changli Station (△ = 80 km) not far from the epicenter sharply decreased. After several strong aftershocks M≥6.0), the amplitude of the pulsation experienced a low process for a long time (several months), but the change before the epicenter was not obvious. Combined with the temporal and spatial distribution of the geotemperature (80 cm depth) in the epicenter area before and after the Tangshan earthquake, the possible relationship between them and the seismogenic process of the Tangshan earthquake was discussed.