利用接收函数研究河北及邻区地壳厚度与泊松比分布特征

地震 ›› 2015, Vol. 35 ›› Issue (2): 34-42.

利用接收函数研究河北及邻区地壳厚度与泊松比分布特征

宫猛^1,2, 李信富³, 张素欣¹, 罗燕⁴, 曾祥芳⁵, 刘丽¹

1.河北省地震局, 河北石家庄 050021;
2.中国地震局地质研究所, 北京100081;
3.中国地质大学(北京), 北京 100083;
4.中国地震局地震预测研究所, 北京 100083;
5.中国科学院大学计算地球动力学重点实验室, 北京 100049

收稿日期:2014-05-15 出版日期:2015-04-30 发布日期:2020-06-24
作者简介:宫猛(1983-), 男, 湖北随州人, 工程师, 在读博士研究生, 主要从事地震活动性及数字地震学等方面研究。
基金资助:
中国地震局震情跟踪定向工作任务(2014020120)及河北省科技支撑计划项目(2014020120)资助

Crustal Thickness and Poisson’s Ratio of Hebei and Adjacent Areas from Teleseisimic Receiver Functions

GONG Meng^1,2, LI Xin-fu³, ZHANG Su-xing¹, LUO Yan⁴, ZENG Xiang-fang⁵, LIU Li¹

1. Earthquake Administration of Hebei Province, Hebei Shijiazhuang, 050000, China;
2. Institute of Geology, CEA, Beijing 100081, China;
3. China University of Geoscience, Beijing 100083, China;
4. Institute of Earthquake Science, CEA, Beijing 100081, China;
5. Key Laboratory of Computational Geodynamics, CAS, Beijing 100049, China

Received:2014-05-15 Online:2015-04-30 Published:2020-06-24

摘要/Abstract

摘要： 本文收集了河北及邻区174个宽频带地震仪2007年1月至2011年12月记录到的全球范围内体波震级6.0以上、共488个远震波形资料。利用H-k叠加搜索方法得到河北及邻区143个台站下方接收函数、地壳厚度和泊松比值分布特征。结果表明, 河北及邻区地壳厚度具有明显的分块特征并与区域构造背景有较好的相关性, 泊松比值在0.25上下变化, 与全球的泊松比估计值相当。河北及邻区地壳厚度以太行山山脉为界呈现出东薄西厚的特征并与地表地形起伏呈正相关; 山西地震带南北地壳厚度存在明显差异, 大同、宁武及安泽盆地地区泊松比值超过0.3; 张—渤地震带的地壳厚度自东向西逐渐增厚, 泊松比值则表现为相对较强的横向变化。华北平原带的薄地壳和低泊松比值特征可能与华北克拉通拆沉作用相关联。

关键词: H-k叠加, 接收函数, 泊松比, 地壳厚度, 河北及邻区

Abstract: We collect waveforms of teleseismic events which occurred from January 2007 to October 2011 from 174 broadband seismic stations deployed in Hebei province and adjacent areas and use H-k stacking method to calculate the average crustal thickness and Poisson’s ratios in the study area. In order to obtain reliable receiver functions, the broadband seismograms of 488 teleseismic earthquakes occurred in the epicentral distance range from 30 degree to 90 degree with magnitudes larger than M_b6.0 were collected. The results show that the crustal thickness exhibit conspicuous lateral heterogeneity and correlate well to the regional geological?tectonic features. Poisson's ratio is equated with global model's estimates which fluctuate at about 0.25. Crustal thickness correlates positively to the topography and the Taihang mountain range is the transition zone of thick and thin crustal thickness. Crustal thickness in the north and south of Shanxi Earthquake Zone exists obvious difference and Poisson's ratios in Tatong, Ningwu and Anze basins are greater than 0.3. Crustal thickness in the Zhangbo Earthquake Zone decreases from west to north and its Poisson’s ratio has conspicuous lateral heterogeneity. The Huabei basin's thin crust and low Poisson’s ratio may correlate with the North China craton delamination.

Key words: Crustal thickness, Poisson ratio, Receive function, H-k stacking, Hebei and adjacent areas

中图分类号:

P315.7

宫猛, 李信富, 张素欣, 罗燕, 曾祥芳, 刘丽. 利用接收函数研究河北及邻区地壳厚度与泊松比分布特征[J]. 地震, 2015, 35(2): 34-42.

GONG Meng, LI Xin-fu, ZHANG Su-xing, LUO Yan, ZENG Xiang-fang, LIU Li. Crustal Thickness and Poisson’s Ratio of Hebei and Adjacent Areas from Teleseisimic Receiver Functions[J]. EARTHQUAKE, 2015, 35(2): 34-42.

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