随机振动有限断层方法计算衡水市强地面运动参数

Estimate of Ground Strong Motion Parameters of Hengshui City by the Modified Stochastic Finite Fault Modeling

摘要: 主要介绍了随机振动的有限断层模型在强地面运动研究中的应用,考虑V₃₀ (地下30 m的平均剪切波速)对强地面运动结果的影响。以衡水为例,计算了6条周边断层设定地震在衡水市的峰值加速度、峰值速度和时程曲线。对衡水市区危害相对最小的是新河断裂和护驾池断裂,峰值加速度值在50～90 cm/s²左右,峰值速度在10 cm/s以下,对应到中国地震烈度表为Ⅵ～Ⅶ度;对衡水主城区危害最大的是衡水断裂,峰值加速度值在200～360 cm/s²左右,峰值速度在30～45 cm/s之间,对应的烈度值为Ⅷ～Ⅸ度。

Abstract: In recent years, with the progress of earthquake science, numerical simulation of strong ground motion has been well developed and has become an important approach to estimate strong ground motion. In this research, considering the impact of V₃₀ (the average shear-velocity down to 30 m), we calculate the Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) for seismic hazard assessment of Hengshui area. Taking Hengshui city as an example, we calculate the PGA and time travel curve with the impact of six scenario earthquakes. Xinhe fault and Hujiachi fault have minimal impact in the main city of Hengshui with PGA about 50~90 cm/s² and PGV below 10cm/s, but if the instability fault is Hengshui fault, the PGA and PGV could be 200~360 cm/s² and 30~45cm/s respectively in Hengshui city.