Examples are presented when propagation of the boundaries of the zones of frictional sliding or elastic shear propagate with the speed of the longitudinal wave (or p-wave) and thus can be confused with the instances of intersonic fracture propagation. In these examples the mechanism of intersonic sliding/shear zone propagation is the longitudinal elastic deformation of the material surrounding the zone and hence controlled by the longitudinal wave velocity. Two simple models of intersonic sliding/shear zone propagation are considered: a frictional sliding of an elastic rod and shearing of an elastic rod on shear Winkler foundation. It is presumed that the shear Winkler layer can have either the conventional positive stiffness or apparent negative stiffness. In all these cases the sliding/shear zone propagates with the longitudinal wave velocity. In the case of negative stiffness of the Winkler layer the deformation rapidly increases with time reflecting the presence of influx of the external energy required by the system that realises negative stiffness.

当摩擦滑动或弹性剪切区域的边界以纵波（或 p 波）的速度传播时，会给出示例，因此可能会与音速间裂缝传播的情况混淆。在这些例子中，音速间滑动/剪切带传播的机制是该区域周围材料的纵向弹性变形，因此受纵波速度控制。考虑了音速间滑动/剪切区传播的两个简单模型：弹性杆的摩擦滑动和弹性杆在剪切温克勒地基上的剪切。假定剪切温克勒层可以具有传统的正刚度或表观负刚度。在所有这些情况下，滑动/剪切带以纵波速度传播。