P波速度对接收函数<i>H-k</i>搜索叠加结果的影响分析

李翠芹; 沈旭章; 秦满忠

doi:10.3969/j.issn.0253-3782.2014.03.013

P波速度对接收函数H-k搜索叠加结果的影响分析

李翠芹¹,
沈旭章^1,2, ,,
秦满忠^1,2

1.
中国兰州 730000 中国地震局兰州地震研究所
2.
中国兰州 730000 中国地震局地震预测研究所兰州科技创新基地

基金项目: 中国地震局地震预测研究所基本科研业务专项(2011IESLZ05)和国家自然科学基金(41274093, 40904014)共同资助.

详细信息

通讯作者:
沈旭章, e-mail: shenxzh@gmail.com

中图分类号: P315.3
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出版历程
- 收稿日期: 2013-05-02
- 修回日期: 2013-07-15
- 发布日期: 2014-04-30

The effect of P wave velocity on the H-k stacking results of receiver functions

1.
Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
2.
Lanzhou Base of Institute of Earthquake Science, China Earthquake Administration, Lanzhou 730000, China

摘要

摘要: 从公式推导、不同模型数值试验和实际资料处理等3个方面，系统研究了P波速度v_PP对接收函数H(地壳厚度)-k(波速比)叠加搜索结果的影响. 结果表明， v_PP的变化与H正相关，与k负相关；且地壳模型越复杂， v_PP对H的影响越大.
- P波速度 /
- H-k搜索叠加 /
- 接收函数
Abstract: This paper systematically investigates the effect of P wave velocity on the H-k stacking results of receiver functions by three aspects of theoretical analyses, numerical tests and observed data processing. The results show that the P wave velocity is positively correlated with crustal depth H, and negatively correlated with wave velocity ratio k. Moreover, the more complex the crust model is, the larger effect P wave velocity has on H.
- P wave velocity /
- H-k stacking /
- receiver function

HTML全文

图 1 单层模型中Ps, PpPs, PpSs+PsPs震相射线路径(左)及接收函数(右)示意图

Figure 1. Ray paths of Ps, PpPs and PpSs+PsPs (left panel) and synthetic receiver functions (right panel) for one-layer simple model

下载: 全尺寸图片幻灯片

图 2 数值试验的理论地壳模型

(a) 单层模型； (b) 双层模型； (c) 含梯度带的双层模型

Figure 2. Three theoretical crustal models for numerical test

(a) One-layered model; (b) Two-layered model; (c) Two-layered model with a gradient structure

下载: 全尺寸图片幻灯片

图 3 单层模型数值试验结果

(a) 理论接收函数； (b)、 (c)和(d)分别表示v_PP为预设值、小于预设值0.3 km/s和大于预设值0.3 km/s时H-k方法的搜索结果. 白色“+”为数据计算得到的结果，黑色圆点表示预设模型； (e)和(f)分别表示数值模拟试验中地壳厚度H和波速比k随v_PP的变化

Figure 3. Numerical test for the one-layer model

(a) Theoretical receiver functions; (b--d) H-k stacking results with default v_PP, smaller v_PP (0.3 km/s less than default v_PP ) and larger v_PP (0.3 km/s larger than default v_PP), respectively. The white crosses represent the calculated values, black dots represent the default values, gray bars represent the stacking amplitude of receiver functions;(e) H versus v_PP in numerical tests; (f) k versus v_PP in numerical tests

下载: 全尺寸图片幻灯片

图 4 双层模型数值试验结果

(a) 理论接收函数； (b)、 (c)和(d)分别表示v_PP为预设值、小于预设值0.3 km/s和大于预设值0.3 km/s时H-k方法的搜索结果.白色“+”为数据计算得到的结果，黑色圆点表示预设模型； (e)和(f)分别表示数值模拟试验中地壳厚度H和波速比k随v_PP的变化

Figure 4. Numerical test for the two-layered model

(a) Theoretical receiver functions; (b--d) H-k stacking results with default v_PP, smaller v_PP (0.3 km/s less than default v_PP ) and larger v_PP (0.3 km/s larger than default v_PP), respectively. The white crosses represent the calculated values, black dots represent the default values, gray bars represent the stacking amplitude of receiver functions; (e) H versus v_PP in numerical tests; (f) k versus v_PP in numerical tests

下载: 全尺寸图片幻灯片

图 5 存在一低速梯度带的双层模型数值试验结果

(a) 理论接收函数； (b)、 (c)和(d)分别表示v_PP为预设值、小于预设值0.3 km/s和大于预设值0.3 km/s时 H-k方法的搜索结果. 白色“+”为数据计算得到的结果，黑色圆点表示预设模型； (e)和(f)分别表示数值模拟试验中地壳厚度H和波速比k随v_PP的变化

Figure 5. Numerical test for the two-layered model with a gradient structure

(a) Theoretical receiver functions; (b--d) H-k stacking results with default v_PP, smaller v_PP (0.3 km/s less than default v_PP ) and larger v_PP (0.3 km/s larger than default v_PP), respectively. The white crosses represent the calculated values, black dots represent the default values, gray bars represent the stacking amplitude of receiver functions; (e) H versus v_PP in numerical tests; (f) k versus v_PP in numerical tests

下载: 全尺寸图片幻灯片

图 6 不同v_PP值对应的天水台实际资料处理结果

(a) 天水台观测接收函数； (b)， (c)， (d)和(e)分别表示v_PP为6.10， 6.20， 6.31， 6.38 km/s时H-k的搜索叠加结果

Figure 6. Example of TSS station with different v_PP

(a) Observed receiver functions; (b) H-k stacking results with v_PP=6.10 km/s; (c) H-k stacking results with v_PP=6.20 km/s; (d) H-k stacking results with v_PP=6.31 km/s; (e) H-k stacking results with v_PP=6.38 km/s

下载: 全尺寸图片幻灯片

图 7 3种模型中v_PP及v_PP变化率对H-k结果的影响

(a) H与v_PP关系； (b) H变化率与v_PP变化率关系； (c) k值与v_PP关系； (d) k变化率与v_PP变化率关系

Figure 7. The influence of v_PP and variation rate of v_PP on the H-k results for the three models

(a) H versus v_PP; (b) The variation rate of H versus the variation rate of v_PP; (c) k versus v_PP; (d) The variation rate of k versus the variation rate of v_PP

下载: 全尺寸图片幻灯片

表 1 天水台各模型的接收函数H-k方法搜索结果

Table 1 H-k stacking results of TSS station for three different models

下载: 导出CSV

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