固液共存系における地震波減衰の定量的評価手法の構築

固液共存体系地震波衰减定量评价方法的构建

• 批准号: 04J11375
• 负责人: 藤澤 和浩
• 金额: $ 1.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04J11375/
• 关键词: 減衰; 地震波; 広帯域; 部分溶融; 強制振動; 縦変形; 縦振動

本研究は,地球内部で生じる地震波減衰(Q^-1)に関して,岩石と共存する流体相の体積分率,ポア形状,粘性率の寄与を明らかにし,減衰観測値の解析手法の構築をめざすものである.今年度は,強い周波数依存性を示す現象である減衰を室内実験でとらえるために,1mHz-100Hzの広帯域で試料に強制振動を印加できる独自の装置の開発を,昨年より継続して行った.開発した装置の概要は平成17年度科学研究費補助金実績報告書で報告した.これまでに,装置特性を把握するための予備測定を行った.アクリルを試料とする測定において,Q^-1=0.01程度の微弱な減衰を,広帯域にわたって測定できることを確認した.複数回の測定において,Q^-1は±0.002程度の誤差で再現された.歪振幅10^-6-2×10^-5の範囲では振幅依存性は現れず,装置特性に含まれ得る非線形性は無視できることが示された.また,応力と歪の振幅比から決定されるEの分散から見積もったQE-1は,位相差から決定されたQE^-1と調和的であり,測定データの信頼性が示された.部分溶融試料の測定結果におけるメルトの存在の寄与を明らかにするために,同じ温度条件下での非溶融試料に関しても測定を行う予定である.部分溶融試料ではメルトの存在が粒成長を促すため,短時間(100時間程度)で界面張力平衡を達成した粒子形状に至るが,非溶融試料では,平衡に達した粒子形状に至るまでにより長い時間が必要であることが予想される.時間にともなう粒成長の進展の程度を明らかにするために,長時間(>200時間)温度制御下においた非溶融試料の顕微鏡観察を行った.等粒状の粒子の成長を観察できた.また,時間にともない粒径が系統的に大きくなっていく様子が観察された.Q^-1の粒径依存性は,減衰のメカニズムを特定するための制約となると考えられる.

In this study, in the interior of the earth, the attenuation of seismic waves (Q ^-1), the coexistence of rocks, the volume fraction of fluid phase, the shape, the viscosity rate, and the analytical technique of attenuation measurement are reported in this study. This year, the strong cycle wave number dependence shows that the system is in bad condition. The 1mHz-100Hz system is used to force the Inca system to operate alone. Last year, the system was in operation. A summary of the equipment will be launched. Pingcheng 17 scientific research grant report will be reviewed. In order to determine the performance of the device, the characteristics of the device should be determined. This is the first time that the data has been measured, Q^-1 has a weak level of 0.01 and is weak, and that the domain is weak. Multiple times to determine the number of errors, Q ^-1 ±0.002 degrees of error will be found again. The skew amplitude is 10 ^-6-2 × 10 ^-5 range. The amplitude dependence of the device is obvious. The device characteristics include the non-shape dependence of the device. The amplitude ratio of the force is determined by the amplitude ratio, the amplitude ratio is determined by the amplitude ratio, the phase difference, the phase difference, the amplitude ratio, the phase difference, the phase difference, the amplitude ratio, the phase difference, the phase difference, the amplitude ratio, the phase difference, the phase difference, the amplitude ratio, the phase difference, the phase difference, the amplitude ratio, the phase difference, the phase difference, the reliability, the reliability. The results of the determination of partially dissolved materials show that the temperature and temperature are in good agreement with each other, and under the same temperature conditions, the temperature of non-soluble materials is determined. In the partially melted alloy, there is grain growth to promote the temperature, and the interface force balance in a short time (100 time). The balance between the shape of the particles and the shape of the non-melted particles, the shape of the particles is reduced to the shape of the particles, and it is necessary to think about it for a long time. The degree of grain growth is clear, and the temperature is controlled by the temperature for a long time (& gt;200 time). Under the control of temperature, the performance of non-dissolved materials is monitored by micromonitoring. Wait for the growth of granular particles to observe the growth of particles. In this paper, time is used to determine the particle size dependence of the particle size system. Q^-1 is dependent on particle size, and the system of specific temperature is very important.