34. On the Cross-correlational Determination of Phase Velocity
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概要
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The cross-correlation method employs a pair of seismograms at two adjacent stations and determines phase velocity of dispersive waves via a cross-correlogram of the two records. Its principle is already known, but it has been seldom used in seismology. We have re-examined this method a little more in detail. Sets of experimental signals have been used to test the technique. Tests using synthesized seismograms have proven the usefulness of this method if appropriate corrections are taken into account. However, as for the actual seismograms recorded at our array stations, the calculated data tend to scatter considerably as the period increases or decreases. With respect to accuracy, our tests suggested no superiority of this method over the conventional phase comparison method. This seems to be inconsistent with the conclusions of former authors(DZIEWONSKI et al., 1968 ; LANDISMAN et al., 1969).接する2観測点の地震の記録の相互相関を用いて波動の位相速度を求める方法の可能性については,二,三の指摘があるが,その利用例は少ない.本報ではこの方法を若干の考察とテストを加えて再評価した.いくつかの波形を用いてテストしたが,合成波を用いた場合は,データの両端を0にするという補正を加えて満足な結果を得る事ができた.しかし,地震研究所の地殻活動総合観測線(南関東)の地震計の記録を用いたテストでは,長周期及び短周期の帯域でばらつきが見られた.精度に関しては,位相速度を求める際通常用いられている,2つの地震記象のフーリエ変換の位相角の差を取る方法に比べて,大きな差は無かった.この事は,DZIEWONSKI et al.(1968)やLANDISMAN et al.(1969)の結果とは一致せず,さらに研究が必要であると思われる.
- 東京大学地震研究所,Earthquake Research Institute, University of Tokyo,Earthquake Research Instituteの論文
- 1984-03-31
東京大学地震研究所,Earthquake Research Institute, University of Tokyo,Earthquake Research Institute | 論文
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