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2004年12月26日苏门答腊-安达曼地震(Mw=9)强烈地激发了低频地震简正模式,为改善极低地震简正模式频率及阻尼测量提供了难得的机会。为改进地球一维密度模型,需对低于1mHz的地震简正模式的频率分裂进行精确估算。本次地震中,首次在超导重力仪和地震波记录无叠加的情况下观测到2S1。本文报告来自11个观测台测得的超导重力仪数据的分析。单个观测台的超导重力仪记录频谱清晰地显示了0S2分裂成5个完全可分辨的单线,0S3分裂成7个单线。给出的结果表明超导重力仪可为低频地震模式的精确分析提供高质量数据。
The Sumatra-Andaman earthquake (Mw = 9) on December 26, 2004 strongly stimulated the low-frequency seismic normal mode, providing a rare opportunity to improve the normal mode frequency and damping measurement of very low earthquakes. In order to improve the Earth’s one-dimensional density model, it is necessary to accurately estimate the frequency splitting of earthquakes normal mode below 1mHz. For the first time in this earthquake, 2S1 was observed in the absence of superimposed superconducting gravimeter and seismic wave records. This paper reports the analysis of superconducting gravimeter data from 11 observatories. The recording spectrum of the superconducting gravimeter at a single observatory clearly shows that 0S2 splits into 5 fully resolvable single lines and 0S3 splits into 7 single lines. The results presented show that the superconducting gravimeter can provide high quality data for the accurate analysis of low frequency seismic modes.