| 珊溪水库地震波速比时空分布特征 |
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| 引用本文： | 钟羽云,张震峰,阚宝祥.珊溪水库地震波速比时空分布特征[J].大地测量与地球动力学,2015,35(5):871-875. |
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| 作者姓名： | 钟羽云 张震峰 阚宝祥 |
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| 摘 要： | 选取P波、S波到时差Δt≤14s的台站数据,使用多台和达法计算珊溪水库地震序列地震波速比,结合地震序列的时空分布特征和发震构造,分析序列的波速比时空分布特征。1)珊溪水库90%的地震波速比分布在1.66~1.75,波速比平均值为1.70;2)珊溪水库地震序列包含有多组地震活动,每组地震的波速比呈开始快速下降之后缓慢上升的变化,每两组地震之间的波速比呈现逐渐增大的趋势,其波速比的变化特征可以归纳为"下降-回升-发生一组地震";3)波速比的变化和震中位置的迁移有一定关系,地震迁移到新的位置时最初几次地震的波速比较大,随后波速比逐渐减小;4)波速比沿深度方向和双溪-焦溪垟断裂方向分布不均匀,位于水库淹没区的双溪-焦溪垟断裂西北段波速比较小,位于水库库岸的双溪-焦溪垟断裂东南段波速比在深度方向上的变化最复杂,存在两个高、低值相间的区域,4级以上地震均发生在这一段5~8km深度处的波速比高、低值过渡区域。
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| 关 键 词： | 珊溪水库 波速比 时空分布 |
The Temporal and Spatial Distribution Characteristics of Seismic Wave Velocity Ratio in Shanxi Reservoir |
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| ZHONG Yuyun,ZHANG Zhenfeng,KAN Baoxiang.The Temporal and Spatial Distribution Characteristics of Seismic Wave Velocity Ratio in Shanxi Reservoir[J].Journal of Geodesy and Geodynamics,2015,35(5):871-875. |
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| Authors: | ZHONG Yuyun ZHANG Zhenfeng KAN Baoxiang |
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| Abstract: | 〗This paper selects P, S wave arrival time difference Δt ≤ 14 s data, and calculates the Shanxi reservoir earthquake sequence seismic wave velocity using the multi-station method, combined with the characteristics of temporal and spatial distribution of seismic sequence and seismic structure. Analysis of the temporal and spatial distribution characteristics of wave velocity ratio sequence shows: 1) The seismic wave velocity ratio in Shanxi reservoir is 90% concentrated in 1.66-1.75, with an average velocity ratio of 1.70. 2) Shanxi reservoir earthquake sequence comprises a plurality of seismic activity. Each group of seismic velocity ratio starts by showing a rapid decline| after a phase of wave velocity ratio showing changes slowly rising. Wave velocity ratios between every two groups of earthquakes generally show a gradually increasing trend. Variation characteristics of wave velocity ratio in Shanxi reservoir earthquake sequence can be summarized as “drop-rebound-a group of earthquake”. 3) There is some relationship between the wave velocity changes and epicentral location. As the earthquake migrates to the new position, the initial several seismic wave velocity ratio is relatively large, and then the velocity ratio gradually reduces. 4) Along the depth direction and along the Shuangxi-Jiaoxiyang fracture direction, wave velocity distribution is not uniform. Wave velocity ratio is relatively small in the northwest segment of the Shuangxi-Jiaoxiyang fault submerged in the reservoir| wave velocity shows the most complex variation in the southeast segment of Shuangxi-Jiaoxiyang fracture. Located in the south bank of the reservoir, there are two transition regions of high value and low value wave velocity ratios. An ML≥4 earthquake occurred in the transition region at a 5-8 km depth. |
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| Keywords: | Shanxi reservoir wave velocity ratio temporal and spatial distribution |
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