高温高圧力下における周期振動実験による地震波減衰測定

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タイトル別名
  • Seismic Attenuation Measurement by Cyclic Loading under High Pressure and Temperature
  • コウオン コウアツリョク カ ニ オケル シュウキ シンドウ ジッケン ニ ヨル ジシンハ ゲンスイ ソクテイ
  • Seismic attenuation measurement by cyclic loading under high pressure and temperature (in Japanese with English abstract)

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An experimental method to study the seismic attenuation factor (Q−1) and anelastic properties of materials at high pressure and high temperature has been established by using the multianvil high-pressure deformation device (D-DIA) and a synchrotron X-ray radiography at SPring8. Time resolved images of the sample and reference material provide their strain as a function of time during cyclic loading. Attenuation is determined as the tangent of the angle of phase lag between the sample and the reference material. A newly installed short period sinusoidal cyclic loading oil pressure system enable us to determine minimal strain of the sample in a wide frequency range from 2 to 0.01 hertz on olivine aggregates at 1 GPa and up to 1673 K. The detectable minimum strain is around 5×10−5. Several test experiments exhibited resolvable Q−1 (10−2) above 1273 K. The results are generally consistent with previously reported data.<br>

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