莫力达瓦、嫩江交界5.0级地震长波辐射异常研究
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摘要
通过涡度、时频分析等方法,研究了莫力达瓦、嫩江交界5.0级地震前,震中区域(124.50°E~126.50°E,47.50°N~52.50°N)红外遥感OLR时空分布特征,结果显示:莫力达瓦、嫩江交界5.0级地震前震中区域OLR涡度场存在显著增强的异常现象;震中区格点(125.50°E,49.50°N)OLR涡度值时序曲线在震前存在显著异常变化,其时频结果也显示在地震前存在能量密度增强现象,异常期间谱结构不断变化。
Based on vorticity analysis and temporal and spatial analysis, the paper studies the temporal and spatial distribution characteristics of outgoing long-wave radiation in the epicentral region( 124.50°E-126.50°E, 47.50° N-52.50° N) of the Molidawa-Nenjiang M5.0 earthquake. The results show that: there exist significantly enhanced anomalies of outgoing long-wave radiation vorticity field in the epicentral region before the Molidawa-Nenjiang M5.0 earthquake; secondly, there are significantly short-term anomaly changes in the timesequence curves of OLR vorticity at grid points( 125.50° E, 49.50° N) in the epicentral region before the Molidawa-Nenjiang M5.0 earthquake; thirdly, the time-frequency analysis results of OLR vorticity at grid point of( 125.50° E, 49.50° N) with short-time fourier transform method show that there exist energy density enhancement phenomenon before the Molidawa-Nenjiang M5.0 earthquake, and the spectral structure changes during abnormity.
引文
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