利用福建爆破实验记录检验华南速度模型

Inspection of the Southern China Velocity Model by the Explosion Test Record

基于2010~2012年"福建及台湾海峡地壳深部结构陆海联合探测"项目中18次爆破实验的准确发震时间、发震位置所确定的多震相走时数据,进行爆破震相特征分析,采用华南速度模型对单纯型、Hyposat、Hypo2000及Locsat等4种定位方法进行比较,得出最优定位方法。利用14炮爆破记录反演得到的速度模型与华南速度模型作比较,结果表明,反演模型的上地壳厚度小于华南模型的,下地壳厚度大于华南模型的,上地壳速度与华南模型的相当,下地壳速度大于华南模型的。利用本研究的反演结果对其他4次爆破进行重新定位,定位精度明显提高。

In this paper,18 explosion tests from 2010 to 2012 of the project of Fujian and the Taiwan Strait Deep Crustal Structure Sea Joint Exploration are used to obtain explosion times and explosion locations so as to determine multiple phase travel time. First we analyze the characteristics of blasting vibration,make a comparison of four location methods of Simple,Hyposat,Hypo2000 and Locsatin for the Southern China model to get the optimal location method.We use the model obtained from the blasting records of 14 inversion results and compare with the Southern China model. The results show that the upper crust thickness is smaller than that of the Southern China model,and the lower crust thickness is greater than that of the Southern China model. The velocity of the upper crust is equal to that of the Southern China model and the velocity of the lower crust is faster than that of the Southern China model. The remaining four blasting records are applied to locate in this inversion model. It is concluded that the location accuracy has improved significantly.