| 講演要旨(和文) | | 2地点間の長期間の微動の相互相関関数からグリーン関数の抽出が試みられている。本研究では南関東において長期間の連続微動観測を行い、地震波干渉法により表面波群速度の抽出を試みる。相互相関関数からは明瞭な信号が確認され、それらからは分散性の表面波成分が顕著に認められた。その結果から得られる群速度は、既往の深部地盤モデルに基づく理論群速度と調和的であった。 |
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| | 講演要旨(英文) | | It has already been demonstrated that an estimate of the Greens function can be obtained from the cross-correlation of long-time ambient noise between two stations, and it can be possible to extract the surface-wave group velocity. We have started observation of ambient noises in the southern Kanto area from March 2008, and the data were processed for estimating the Greens functions. The result shows that the estimated Greens functions propagate by the different velocities because of the complexity of geology of this area. Furthermore, they have specific azimuthal dependence. Finally, we estimated the surface wave velocity from the estimated Greens function assuming a straight path. The result compares favorably with previous estimates of microtremor exploration. |
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