|
|||||
|
|
| 苏鲁地区剪切波速度结构研究及与地震关系探讨 | |
| 引用本文： | 张学民,刁桂苓,束沛一,王卫民,周翠英,赵英萍.苏鲁地区剪切波速度结构研究及与地震关系探讨[J].西北地震学报,2005,27(2):101-108. |
| 作者姓名： | 张学民 刁桂苓 束沛一 王卫民 周翠英 赵英萍 |
| 作者单位： | 1. 中国地质大学地球物理与信息技术学院,北京,100083;河北省地震局,河北,石家庄,050021 2. 河北省地震局,河北,石家庄,050021 3. 中国科学院地质与地球物理研究所,北京,100029 4. 山东省地震局,山东,济南,250014 |
| 基金项目： | 河北省地震局硕博联合基金资助. |
| 摘 要： | 利用S波纯波形拟合法以及T函数法反演了苏鲁地区壳幔剪切波速度结构,并利用长周期P波T函数反演得到了连云港和莱阳台下方800km深度的速度结构。结果显示:(1)苏鲁地区大部分台站地壳表层及上地壳浅部速度偏高,分别对应高压、超高压物质和古老基底出露地区;(2)沿郯庐断裂带分布的台站均显示明显低速层,并具有北浅南深的特点;(3)连云港和莱阳台超深度反演结果显示两台均在150km深度下出现高速层,反映扬子板块的俯冲深度为100km以下,俯冲板片厚度在100km以上;板片拆离下沉深度甚至达到300km或者更深;(4)地震深度分布与低速层关系密切,沿郯庐断裂和烟台—五莲断裂的中小地震震源深度都比较深,有的甚至达到地壳的底部,反映这两条断裂目前切割深度都比较大,而且地幔物质相对比较活跃。 |
| 关 键 词： | 苏鲁地区 剪切波速度结构 低速层 T函数 |
| 文章编号： | 1000-0844(2005)02-0101-08 |
| 收稿时间： | 07 12 2004 12:00AM |
| 修稿时间： | 2004年7月12日 |
Study on Shear Wave Velocity Structure beneath Jiangsu and Shandong Province and Its Relationship to Earthquakes |
|
| ZHANG Xue-min,DIAO Gui-ling,SHU Pei-yi,WANG Wei-min,ZHOU Cui-ying and ZHAO Ying-ping.Study on Shear Wave Velocity Structure beneath Jiangsu and Shandong Province and Its Relationship to Earthquakes[J].Northwestern Seismological Journal,2005,27(2):101-108. | |
| Authors: | ZHANG Xue-min DIAO Gui-ling SHU Pei-yi WANG Wei-min ZHOU Cui-ying and ZHAO Ying-ping |
| Institution: | 1. School of Geophysics and Information Technology, Chink University of Geosciences,Beijing 100083, China ; 2. Earthquake Administration of Hebei Province, Shijiazhuang 050021, China; 3. Instituteof Geology and Geophysics, ChineseAcademy of Science, Beijing 100029, China; 4. EarthquakeAdministrationof Shandong Province, Jinan 250014, China |
| Abstract: | Using pure S waveform fitting and T function method, the shear wave velocity structures in crust and upper mantle under seismic stations in Jiangsu and Shandong province are obtained. By employing T function method on long-period P wave records, S wave velocity structures about 800 km deep are also inversed under Lianyungang and Laiyang stations. The results show that: (1) the majority of stations in Jiangsu and Shandong province are located on where the shallow crust with high velocity, which is corresponding to the area with outcropping high-pressure and ultrahigh-pressure materials, and outcropping paleo-basement, respectively; (2) stations along Tancheng-Lujiang Fault present low velocity layers underneath, and the low velocity layer is deeper at south segment than that at north segment of the fault; (3) Great depth inversions under Lianyungang and Laiyang stations show that below the depth of 150 km both exhibits high velocity layer, which demonstrates that underthrust Yangtzi plate is under the depth of 100 km, with thickness of 100 km, and delaminated slab can reach 300 km or deeper; (4) depth of earthquakes is closely related to the distribution of low velocity layers, along Tancheng-Lujiang and Yantai-wulian fault the focals are relatively deep, some even at the bottom of crust, which reflects that the cutting depth of two faults is larger and upper mantle there is active. |
| Keywords: | Jiangsu and Shandong Province Shear wave velocity structure Low velocity layer T Function |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《西北地震学报》浏览原始摘要信息 | |
| 点击此处可从《西北地震学报》下载免费的PDF全文 | |