摘要
测定了腾冲火山区地震震中位置和震源深度 ,对火山区及附近的震源深度、地震时距曲线和地震波速度等地震学参数特征作了分析。结果表明 ,腾冲火山区地震震源深度相对较小 ,向周围地区逐渐增大 ,震源深度分布的低值区 ,又是环境剪应力场的低值分布区。腾冲火山区P、S波平均速度 ,明显比外围地区小 ,腾冲火山区存在低速区。这些地震学参数分布的差异 ,一方面反映出腾冲地区作为火山区的固有特征及其地域分布的大小 ,同时也揭示出腾冲火山在近代仍然表现出一定的活动性 ,是近代休眠火山。
Epicenters and focal depths in tengchong volcano areas have been observed in this paper. The authors also analyzed the parameters, such as focal depths, curves of time distance and velocities of seismic waves. The results show that depths around Tengchong volcano areas are relatively shallow, and becoming deeper towards outside. The distribution of low values of depths is corresponding to that of ambient shear stress field. Average velocities of P and S area obviously smaller than that of outside. There exists an area of low velocity. These differences of seismological parameters reflect the natural features and size of area of Tengchong volcanoes. They also show that Tengchong volcanoes are active to some extend in modern times, the dormant volcanoes.
出处
《地震研究》
CSCD
北大核心
2000年第2期95-99,共5页
Journal of Seismological Research
基金
云南省科技攻关项目
关键词
震源深度
地震波速度
腾冲火山区
地震
focal depth, curve of time distance, velocity of seismic wave, Tengchong volcano areas
