A study on interaction of asperilies based on laboratory and numerical experimets

基于实验室和数值实验的星体相互作用研究

• 批准号: 14540392
• 负责人: YOSHIDA Shingo
• 金额: $ 2.43万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540392/
• 关键词: asperity; aseismic slip; episodic slow slip; interaction; rate-and state-dependent friction law

We studied various slip modes on a plate boundary on the basis of a two-degree-of-freedom block-spring model and large-scale biaxial experiments. Slip experiments were conducted using large granite blocks with a pre-existing fault surface of 100 cm in length. Velocity-strengthening friction was given over a half of the fault length by inserting a thin Teflon sheet, while the other half retained velocity-weakening friction of the bare rock surface. Under a loading at a constant velocity, dynamic stick-slip repeated on the velocity-weakening region, causing afterslip on the velocity-strengthening region. The velocity-strengthening region experienced small coseisic slip as well, with the magnitude decreasing with the distance from the velocity-weakening region. The behaviors observed in the laboratory experiments were quantitatively simulated by a two-degree-of-freedom block-spring model, in which two blocks (Block 1 and Block 2) are connected by a liner spring and driven by a slowly moving driver. The friction on each block was assumed to obey rate and state dependent friction law. When a-b was assumed to be negative for Block 1, and positive for Block 2, afterslip occurred at Block 2. This model can also reproduce wide spectrum of slip modes observed on a plate-boundary, including episodic slow slip.

我们根据板界的两度块状模型和大规模双轴实验研究了板边界上的各种滑动模式。使用大型花岗岩块进行滑移实验，其长度为100 cm。通过插入薄的特氟龙板，在断层长度的一半以上给出了速度强度的摩擦，而另一半则保留了裸岩表面的速度速度摩擦。在恒定速度下的载荷下，在速度渗透区域重复动态棒状滑移，导致速度强度加强区域的后滑动。速度强度的区域也经历了小的Coseisic滑动，随着距离速度驾驶区域的距离的幅度降低。在实验室实验中观察到的行为是通过两度自由度块 - 弹簧模型定量模拟的，其中两个块（块1和块2）由衬里弹簧连接，并由缓慢移动的驱动器驱动。假定每个区块上的摩擦遵守率和国家依赖摩擦法。当假定A-B对块1为阴性，而对于块2为正时，在块2处发生后置后，该模型还可以重现在板块边界上观察到的宽阔的滑动模式，包括情节慢滑。

项目成果

加藤尚之: "プレート境界面の摩擦パラメーターの推定について-三陸沖のアスペリティを例として-"地学雑誌. 112・6. 857-868 (2003)

加藤直之：“板块界面摩擦参数的估计 - 以三陆海岸的粗糙度为例 -”地质杂志 112・6（2003）。

加藤尚之: "プレート境界面の摩擦パラメターの推定について-三陸沖のアスペリティを例として-"地学雑誌. 112・6. 857-868 (2003)

加藤直之：“板块界面摩擦参数的估计 - 以三陆海岸的粗糙度为例 -”地质杂志 112・6（2003）。

Kato, A., S.Yoshida, M.Ohnaka, H.Mochizuki: "The dependence of constitutive properties on temperature and effective normal stress in seismogenic environment"Pure, Appl.Geophys.. (in press). (2003)

Kato, A.、S.Yoshida、M.Ohnaka、H.Mochizuki：“地震环境中本构特性对温度和有效正应力的依赖性”Pure，Appl.Geophys..（出版中）。

Yoshida, S., N.Kato: "Episodic aseismic slip in a two-degree-of-freedom block model"Geophys.Res.Lett.. 30. 1681,doi:10.1029/2003GL017439 (2003)

Yoshida, S., N.Kato：“二自由度块体模型中的情景抗震滑移”Geophys.Res.Lett.. 30. 1681，doi:10.1029/2003GL017439 (2003)

Yoshida, S., N.Kato: "Episodic aseismic slip in a two-degree-of-freedom block model"Geophys.Res.Lett.. 30. 1681,doi:10.1029-2003GL017439 (2003)

Yoshida, S., N.Kato：“二自由度块模型中的情景抗震滑移”Geophys.Res.Lett.. 30. 1681，doi:10.1029-2003GL017439 (2003)