本文選題：散射 + 月震尾波��； 參考：《地球物理學(xué)報》2015年05期

【摘要】：在阿波羅月震記錄中普遍存在著強烈持久的尾波信號,這樣的波形特征無法用均勻分層月球模型解釋.一個普遍被接受的解釋是月震尾波由月球淺層結(jié)構(gòu)對月震波的散射引起.我們采用基于交錯網(wǎng)格的偽譜和有限差分混合方法模擬研究非均勻上月殼對月震波的散射效應(yīng),在此基礎(chǔ)上解釋月震尾波的形成機制,并估計出上月殼速度擾動的強度.我們發(fā)現(xiàn),在均勻分層模型基礎(chǔ)上,進一步考慮上月殼中的非均勻結(jié)構(gòu)對月震波的散射效應(yīng),能有效地解釋月震信號中強烈持久的尾波.我們認(rèn)為月震尾波可能是由上月殼中的低波速、低衰減和散射這三個因素的共同作用所引起.采用不同的擾動標(biāo)準(zhǔn)差模擬上月殼的非均勻性,并比較模擬波形與真實月震圖的相似程度,我們發(fā)現(xiàn)上月殼中速度擾動的標(biāo)準(zhǔn)差應(yīng)該在3%到5%之間,很可能接近于3%.
[Abstract]:Strong and persistent coda signals are commonly found in the Apollo lunar seismic records, which can not be interpreted by the uniform stratified lunar model. A generally accepted explanation is that the coda of a lunar earthquake is caused by the scattering of the wave by the shallow structure of the moon. In this paper, we use the mixed pseudo-spectral and finite-difference method based on staggered grids to simulate the scattering effect of the inhomogeneous shell to the lunar seismic waves, and then explain the formation mechanism of the coda waves of the lunar earthquakes and estimate the intensity of the velocity disturbances of the lunar shells. We find that on the basis of homogeneous stratification model, the scattering effect of non-uniform structures in the lunar shell on the monthly seismic wave can be considered further, which can effectively explain the strong lasting coda in the lunar seismic signal. We think that the coda of a lunar earthquake may be caused by the interaction of three factors, namely, low wave velocity, low attenuation and scattering in the shell of last month. Using different disturbance standard deviations to simulate the inhomogeneity of the shell and compare the similarity between the simulated waveform and the real monthly seismogram, we find that the standard deviation of velocity disturbance in the shell should be between 3% and 5%, which is likely to be close to 3%.
【作者單位】： 北京大學(xué)地球與空間科學(xué)學(xué)院地球物理系;日本東京大學(xué)地震研究所;
【基金】：國家自然科學(xué)基金(41374046,41174034)資助
【分類號】：P184

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相關(guān)期刊論文 前10條

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本文編號：2028592