利用接收函数研究渤海湾盆地沉积层结构

武岩; 丁志峰; 朱露培

doi:10.3969/j.issn.0253-3782.2014.05.008

利用接收函数研究渤海湾盆地沉积层结构

武岩^1,2, ,,
丁志峰^1,2,
朱露培³

1.
中国北京 100081 中国地震局地球物理研究所
2.
中国北京 100081 中国地震局地震观测与地球物理成像重点实验室
3.
Department of Earth and Atmospheric Sciences, Saint Louis University, Missouri 63103, USA

基金项目: 中央级公益性科研院所基本科研专项(DQJB12B19)资助.

详细信息

通讯作者:
武岩, e-mail: wuyan@cea-igp.ac.cn

中图分类号: P315.2
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出版历程
- 收稿日期: 2014-02-22
- 修回日期: 2014-03-20
- 发布日期: 2014-08-31

Sedimentary basin structure of the Bohai Bay from teleseismic receiver functions

Wu Yan^1,2, ,,
Ding Zhifeng^1,2,
Zhu Lupei³

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
Key Laboratory of Seismic Observation and Geophysical Imaging, China Earthquake Administration, Beijing 100081, China
3.
Department of Earth and Atmospheric Sciences, Saint Louis University, Missouri 63103, USA

摘要

摘要: 对布设于渤海湾盆地地区的70个台站2006年9月—2009年9月记录到的895个远震数据进行接收函数计算，发现位于沉积层上的台站记录的接收函数震相较为复杂，由沉积层基底的转换波、多次波及莫霍面转换波、多次波共同构成，且随着沉积层厚度的增加，沉积层基底转换波、多次波与莫霍面转换波、多次波震相相互叠加，使之无法分辨出莫霍面转换波及多次波到时.为此，本文利用相邻算法对沉积层模型进行搜索，以获取与实际波形误差最小的波形相对应的模型，即台站下方的沉积层结构.结果显示：① 渤海湾盆地由NNE向展布的坳陷带与隆起带组成，冀中坳陷带的沉积层厚度为3—6 km，坳陷带内沿NE-NNE向分布着带状凹陷带与凸起带相间的次级构造，而且其东侧靠近沧县隆起区的凹陷带沉积层基底埋深最大，体现了渤海湾盆地基底受正断层控制而形成的半地堑(地堑)-半地垒(地垒)构造；② 隆起带的波速比v_P/v_S大于坳陷带的波速比，推测与隆起带下第三系地层的缺失有关，坳陷带内高波速比地区与地热田的分布相对应，说明沉积层内高温环境下波速比较高；③ 隆起带内的S波平均速度较坳陷带内的S波平均速度小，且冀中坳陷带内沉积层较厚地区对应的S波平均速度比其它地区更大，说明渤海湾地区沉积层厚度与沉积层内的S波平均速度成反比关系，推测与下第三系地层的厚度有关，且下第三系地层越厚的地区，S波平均速度越大.以上结果表明，利用接收函数研究的结果与通过地质、地热等方面的研究结果存在着良好的对应关系.
- 接收函数 /
- 渤海湾盆地 /
- 沉积层结构 /
- 相邻算法
Abstract: We calculated P wave receiver functions using 895 teleseismic events from September 2006 to September 2009 recorded by 70 temporary stations located in the Bohai Bay basin.We found that it is difficult to identify the P to S converted phases from the Moho discontinuity.The first few seconds after the direct P arrival are mainly controlled by the sedimentary structure response which includes the Ps phase generated by the bottom of the basin and its multiple reverberations in the basin.Based on these characteristics, we used the neighborhood algorithm to invert the data and try to find the best basin velocity model that produces the best fit between the theoretical receiver functions and observed ones in the least-squares sense.The results show that there is a series of depressions and uplifts orienting in the NNE direction in the Bohai Bay basin.The sedimentary depth in the Jizhong Depression is about 3-6 km.There are several secondary depressions and uplifts alternating in the NNE or NE direction in the Jizhong depression.The thickest sedimentary layer is located in the eastern Jizhong depression.The above shows the characteristics of a half rift valley (rift valley)-half horst (horst) structure.The ratio of the P velocity to S velocity in the uplifts is larger than that in the depressions, which may be caused by the lack of the Paleogene stratum in the uplifts.The proximity of geothermal fields to the high v_P/v_S ratio depressions shows a close relationship between the high temperatures of the stratum and the large v_P/v_S ratios .The average of S velocity of the sedimentary in the uplift is smaller than that in the depression, and the thicker sedimentary area always has a higher average S velocity.These characteristics show a relationship between thick sedimentary and high average S velocity.It may be because that the thicker sedimentary area has a thicker Paleogene stratum and the S velocity of the Paleogene stratum is much higher than that of the Neogene and Quaternary stratums.The sedimentary structure provides a base to determine crustal structure beneath the Bohai Bay basin.
- receiver function /
- Bohai Bay basin /
- sedimentary structure /
- neighborhood algorithm

HTML全文

图 1 研究区域构造分布图

Figure 1. Distribution of the tectonic structure in the research area

下载: 全尺寸图片幻灯片

图 2 研究区域台站分布南北两条测线之间的名称为连续数字，分别以L和K开头.右上角小图为震中分布

Figure 2. Distribution of the stations in the research area Upper-right inset gives the distribution of epicenters.The name of the stations in north and south profiles are in continuous numbers，which begin with L and K

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图 3 接收函数计算结果(每个台站的接收函数按射线参数排列)(a)基岩台站接收函数;(b)-(d)沉积层台站接收函数

Figure 3. The results of the receiver functions.For a given station，the receiver functions are sorted by ray parameter (a)Receiver function of a rock station;(b)-(d)Receiver functions of the stations located on sedimentary

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图 4 利用相邻算法得到的波形模拟结果(a)及S波速度模型与波速比(b)图(a)中红色波形为利用最佳模型计算出的波形；图(b)中灰色区域为整个模型参数的搜索范围，绿色区域为误差最小的1 000个模型的分布区域，红色实线为最佳模型，红色虚线为基于IASP91模型得到的波速比v_P/v_S

Figure 4. The results of waveform fitting by the neighboring algorithm method (a)Waveform comparison，where the red waves are the synthetic wave calculated by the best-fitting model; (b)S-velocity velocity models and v_P/v_S ratios where the gray shaded area shows the entire sampled model space，and the green area represents the best 1 000 models that have the lowest misfit，red trace represents the model with lowest misfit，red dashed trace represents v_P/v_S from IASP91 model

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图 5 渤海湾盆地沉积层厚度分布地质结构据林世辉，龚育龄，(2005)修改；Z测线引自Zheng等（2005）

Figure 5.
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图 6 渤海湾盆地沉积层波速比分布（地热田根据梁宏斌等（2010）修改）

Figure 6. Distribution of the v_P/v_S ratioin the sedimentary of Bohai Bay basin where the geothermal field is modified from Liang et al(2010) ①Daxing geothermal field; ② Niutuozheng eothermal field; ③Gaoyang geothermal field;④ Liucun geothermal field; ⑤ Liulu geothermal field; ⑥ Xianxian geothermal field; ⑦ Dacheng geothermal field;JZ: Jizhong depression; CX: Cangxian uplift; HH: Huanghua depression; CN:Chengning uplift

下载: 全尺寸图片幻灯片

图 7 渤海湾盆地沉积层S波平均速度分布

Figure 7. Distribution of average S velocities in the sedimentary of Bohai Bay basin JZ: Jizhong depression; CX: Cangxian uplift; HH: Huanghua depression; CN: Chengning uplift

下载: 全尺寸图片幻灯片

图 8 测线L纵剖面的S波速度分布(地质结构陆克政等(1997))

Figure 8. The S wave velocity structure of the profile L where the tectonic structure is from Lu et al(1997)

下载: 全尺寸图片幻灯片

图 9 测线Z的纵切面沉积层分布测线Z选取与Zheng等(2005)的测线位置相同，地质结构引自陆克政等(1997)

Figure 9. The S velocity structure of the profile Z The location of profile Z is from Zheng et al(2005),and the tectonic structure is from Lu et al(1997)

下载: 全尺寸图片幻灯片

表 1 各台站最佳沉积层结构模型参数

Table 1 The best sedimentary model of eachstation

下载: 导出CSV

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