Seismic interferometry analysis of short-period microtremor observed with a linear array for estimating two-dimensional shallow S-wave velocity structures -An experiment in a ground of Iwate University-

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  • 浅部2次元S波速度構造推定を目的とした短周期微動の地震波干渉法解析－岩手大学構内における試み－
  • センブ 2ジゲン Sハ ソクド コウゾウ スイテイ オ モクテキ ト シタ タンシュウキ ビドウ ノ ジシンハ カンショウホウ カイセキ : イワテ ダイガク コウナイ ニ オケル ココロミ

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Abstract

<p>We applied seismic interferometry analysis to linear array records of microtremors observed with eleven three-component seismometers in order to aim to develop a new method for exploring shallow two dimensional S wave velocity structures using short period microtremors. As a result, in the stacked cross correlation analysis, it was possible to confirm characteristic phases propagating in all directions of NS, EW and UD as a result of arranging seismometers at equal intervals in the linear array. In estimating the group velocities, the signal to noise ratios (SNRs) were particularly low in the NS direction, and it was difficult to estimate correct group velocities. On the other hand, in the EW and UD directions, it was shown that the frequency range where the SNR is higher than 10 is wide. Moreover, since it was close to the value calculated from the existing model, it is considered that a reasonable group velocity could be estimated. As a result of displaying the group velocity obtained in all combinations in two dimensions, it became clear that the group velocity slightly changed in the horizontal direction at high frequencies.</p>

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