摘要
前驱波是一种暂态信号,是在震源成核过程中发射出的低频波,可能是一种有价值的短临前兆信息。选取功率谱、傅里叶谱和边际谱分析方法,对黑龙江及邻区3次中强地震前,水位和竖直摆倾斜共5次低频前驱波异常进行分析,给出水位和竖直摆倾斜低频前驱波频谱特征,丰富了3种前驱波信息提取方法在黑龙江及邻区的应用。
The precursory wave is a kind of transient signals and low-frequency waves in the process of source nucleation.It is maybe an important prediction value and reliable short-impending precursor information.In this paper,5 times of low-frequency precursory wave anomalies of water level and vertical pendulum tilt,respectively,before 3 times moderately strong earthquakes in Heilongjiang and adjacent area are extracted by selecting power spectrum method, Fourier spectrum method and marginal spectrum method based on Hilbert Huang transform. And the spectrum characteristics of low-frequency precursor wave of water level and vertical pendulum tilt are obtained,that have enriched the application of three methods for extracting precursor informations in Heilongjiang and adjacent area.
出处
《地震地磁观测与研究》
2014年第3期38-46,共9页
Seismological and Geomagnetic Observation and Research
基金
中国地震局地震科技星火计划项目(XH12015Y)
黑龙江省自然科学基金项目(200906)资助
关键词
中强地震
前驱波
频谱特征
the moderately strong earthquakes
precursor waves
spectrum characteristics
