Earthquake magnitude is closely related to the depth extent of the seismogenic zone, and higher magnitude earthquakes occur where the seismogenic zone is thicker. The frictional properties of the dominant mineral constituents of the crust, such as feldspar-group minerals, control the depth extent of the seismogenic zone. Here, the velocity dependence of the steady-state friction of anorthite, the calcic endmember of the feldspar mineral series, was measured at temperatures from 20 to 600 °C, pore pressures of 0 (“dry”) and 50 MPa (“wet”), and an effective pressure of 150 MPa. The results support previous findings that the frictional properties of feldspar play a dominant role in limiting the depth extent of the seismogenic zone. This evidence suggests that brittle deformation of anorthite may be responsible for brittle fault movements in the brittle–plastic transition zone.

中文翻译：

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钙长石（长石）的摩擦特性：对地震带下边界的影响

地震的震级与发震带的深度范围密切相关，发震带越厚，越容易发生震级越高的地震。地壳主要矿物成分（如长石族矿物）的摩擦特性控制着地震带的深度范围。在这里，长石矿物系列的钙质端元钙长石稳态摩擦的速度依赖性是在 20 至 600 °C 的温度、0（“干”）和 50 MPa（“湿”）孔隙压力下测量的。 )，有效压力为 150 MPa。结果支持先前的发现，即长石的摩擦特性在限制地震带的深度范围方面起主导作用。