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神岡におけるレーザー伸縮計 京都大学大学院理学研究科 竹本修三 計画研究(サ)地球物理への応用
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Kamioka Observatory ( Superconducting Gravimeter ) ・ ・ CMG-3T seismometer
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100m Laser Strainmeter System N E The Optical Table 2 The Optical Table 1 The Data Acquisition System The Optical Fiber Cable CMG-3T Seismometer
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① LS1 ( EW ) ② LS2 ( NS-EW ) ③ Absolute Strainmeter ( NS ) Laser Strainmeter System
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Ext. EW NS
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Original Record Drift Atmospheric Pressure Response Tidal Components EW Component Ext.
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Atmospheric Pressure Response Drift Original Record Tidal Components Ext. NS Component
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Comparison of Observed and Theoretically Expected Tidal Constituents (EW)
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Comparison of Observed and Theoretically Expected Tidal Constituents (NS)
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・ To explain the discrepancies, we investigated the topographic effects on tidal strain observation by applying the 3D-FEM program ANSYS ED (Cybernet Systems Ins.) to the strain data from June 12 to October 2 (113days). The relationship between the regional homogeneous strain, the local strain at the observation site, and the topographic effects
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神岡鉱山周辺 地形図 (10 x 10km)
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4.5km × ● 1km N E Observatory (h=358m) Atotsu-River Takahara-River 1.8km h= - 2000m × 3D Finite Element Model (243 Elements) Poisson’s ratio σ = 0.283 Young’s modulus E = 67GPa 4.5km
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Contour Plot of T 11 0.00.1-0.080.00.2-0.2 1.01.70.8 ● ● ● h=358m E N Contour Plots of T 11, T 21 and T 31 Contour Plot of T 31 Contour Plot of T 21 E N displacement
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0.00.1-0.05 0.00.2-0.21.01.50.8 ● ● ● Contour Plots of T 12, T 22 and T 32 Contour Plot of T 12 Contour Plot of T 32 Contour Plot of T 22 E N displacement h=358m E N
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0.00.05-0.05 0.00.05-0.05 1.01.50.7 ● ● ● Contour Plots of T 13, T 23 and T 33 Contour Plot of T 13 Contour Plot of T 23 Contour Plot of T 33 E N displacement h=358m E N
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Matrix representing the topographic effects around the observation site obtained from 3D-FEM analysis e
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Comparison between Observed and Theoretically Expected Tidal Constituents (before and after the topographic effects compensation) EW
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Comparison between Observed and Theoretically Expected Tidal Constituents (before and after the topographic effects compensation) NS
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ひずみデータ・気圧データ ( 2003 年 6 月 12 日~ 10 月 2 日: 113 日間) ext. EW NS 気圧 台風
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0.0e+000 1.0e-008 2.0e-008 3.0e-008 4.0e-008 5.0e-008 08/1208/118/108/98/88/78/68/58/48/3 940 950 960 970 980 STRAIN ATMOSPHERIC PRESSURE [hPa] EW NS 気圧 台風時におけるひずみ変化と気圧変化 ext.
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8 月 9 日 12 時 2003 年台風 10 号の実際の進路と中心気圧 8月9日0時8月9日0時 8月8日0時8月8日0時 8 月 10 日 0 時 (気象庁のホームページより http://www.data.kishou.go.jp/bosai/report/2003/20030807/20030807_d.html ) 台風位置表 Kamioka Obs.
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仮定する台風の気圧勾配 p=p 0 ( 1+r/r 0 ) -3/2 [TRUBITSYN and MAKALKIN, 1976] ( p 0 は中心の気圧 =-50hPa, r 0 は p が約 1/3 になる距離 =500km ) p[hPa] r[km] p 0 =-50hPa r 0 =500km ext.
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1000 996 992 1004 1008 (気象庁のホームページより, http://www.jma.go.jp/JMA_HP/jma/press/0308/13b/t0310.pdf ) 実際の台風と使用したモデルの気圧分布の比較 モデル ( P 0 =-38hPa , r 0 =400km ) 実際
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r[km] ext. r と ε r , ε θ の関係(計算結 果) εrεr εθεθ ( P 0 =-50hPa , r 0 =500km , μ=25.1GPa , ν=0.283 )
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p[hPa] [km] 仮定する台風の気圧勾配( p 0 =-50hPa , r 0 =500km ) r εrεr εθεθ
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EW NS ext. 観測値 計算値 観測値 計算値 ext. 1.4×10 -8 台風の荷重影響の観測値と計算値の比較
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100m Laser Strainmeter in Kamioka ( Resolving Power :10 -13 ) ◎ Free Core Nutation (1x10 -11 ) ◎ Incessant Excitation of the Earth’s Free Oscillations (1x10 -12 ) ○ Seismic Core Modes (1x10 -12 ) △ Core Undertone (1x10 -13 ) △ Slichter modes (1x10 -13 )
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100m Laser Strainmeter System + Superconducting Gravimeter Continuous Excitation of Earth’s Free Oscillation Separation of “Spheroidal Modes” and “Torsional Modes” Slichter triplet: (1x10 -13 ) ( PREM) retrograde (4.77h), central(5.31h), prograde(5.98h) Core Undertones (1x10 -13 )
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FG-5型絶対重力計
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