Particle velocity models of longitudinal and transversal waves in the near field of sealed explosions

The seismic data of low-yield explosion earthquakes which took place in the Quaternary period soil were based on to calculate the particle velocities of the longitudinal and transversal waves and determine the parameters for the existent models. The three representative models were synthetically analyzed. It displays that the difference of the existent models lies in different yield exponents. Accordingly, a double-extreme model was proposed and the calculation method of the model parameters was introduced in detail. Comparison of these models shows that the data calculated by the double-extreme model is the most consistent with the real observation and the amplitude error between them is the smallest. The best results calculated by the traditional velocity models only approach these calculated by the double-extreme model.