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本实验用超声地震模型实验模拟观测,滇西地震实验场地质构造格架对地震波波速的影响。模型为1米量级。模型与原型地质的比为1∶470000。实验模型有两块,一块为均匀无构造模型,另一块为有滇西实验场主要地质构造格架模型。实验对两种模型的P波速进行了比较,给出了以模型中心为观测点以及以昆明、中甸、下关和渡口为观测点,模拟震中距为50公里、100公里、150公里和200公里圈上P波波速变化的背景场。这一实验是用物理模型模拟研究复杂地质构造格架对地震波波速影响的首次方法探讨。
In this experiment, the experimental observation of the ultrasonic seismic model was used to simulate the influence of the geological tectonic framework on the seismic wave velocity in the western Yunnan seismic field. The model is on the order of one meter. The ratio of model to prototype geology is 1: 470000. There are two experimental models, one is uniform and non-tectonic model, and the other is the main geological tectonics model of western Yunnan experimental site. The P wave velocities of the two models are compared experimentally, and given the model center as the observation point and the observation points of Kunming, Zhongdian, Shimonoseki and the ferries as the observation points, the epicentral distances between the epicenter and the epicenter are 50 km, 100 km, 150 km and 200 P wave velocity changes in the background circle of km circle. This experiment is a first-of-a-kind method to simulate the effects of complex geological formations on the velocity of seismic waves using physical models.