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宾川地区的地壳厚度和泊松比分布特征研究
邓嘉美,金明培,陈佳,高琼,张华英,王军,叶泵
作者单位E-mail
邓嘉美 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
金明培 中国地震局滇西地震预报实验场办公室, 云南大理 671000 jmp69@263.net 
陈佳 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
高琼 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
张华英 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
王军 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
叶泵 中国地震局滇西地震预报实验场办公室, 云南大理 671000  
摘要:
利用宾川主动源16个地震台站2011年9月~2014年1月期间记录的5.8级以上远震波形资料,提取各台站下方的P波接收函数,并据此计算、分析宾川地区地壳厚度变化情况和泊松比分布特征。得到高空间分辨率的结果,宾川地区平均地壳厚为45.3km,地壳厚度呈现“北深南浅”、“西浅东深”的特征。地壳厚度最深的是小银甸,47.9km,最浅的是排营台,42.1km,两者相差5.8km。程海断裂附近Moho面较深,红河断裂附近Moho面较浅;程海断裂附近等值线变化比较剧烈,红河断裂附近地壳厚度变化较为舒缓。从泊松比的分布情况来看,研究区内泊松比分布是不均匀的,自南向北存在较大差异,呈现“北低南高”的特征。红河断裂附近,泊松比属于中高泊松比(0.26 ≤ σ ≤ 0.29),程海断裂附近,泊松比属于低泊松比(σ≤0.26)。泊松比分布特征和地壳厚度相反,表明宾川地区的增厚方式主要由上地壳增厚方式所致。
关键词:  宾川地区  接收函数  地壳厚度  泊松比
DOI:
分类号:
基金项目:This project was sponsored by the Specific Fund of Fundamental Research, Institute of Geophysics, China Earthquake Administration (DQJB16B19).
Characterization of the Crustal Thickness and Poisson's Ratio of the Binchuan Region
Deng Jiamei,Jin Mingpei,Chen Jia,Gao Qiong,Zhang Huaying,Wang Jun,Ye Beng
Abstract:
This paper presents the changes of crust thickness and Poisson's ratios distribution in the Binchuan region, where the first air-gun transmitting station and it's a small dense array were deployed. From September 2011 to January 2014, more than 239 teleseismic events of M ≥ 6.0 were recorded in 16 stations in the Binchuan region. Their P-wave receiver functions were analyzed respectively. The high spatial resolution result shows that the average crust thickness of Binchuan region is 45.3km, it follows the rule of "deeper in the north and east part, shallower in the south and west part." The deepest region is in Xiaoyindian Station; the crust thickness is 47.9km; the shallowest region is in Paiying Station, it has the thickness of 42.1km. It shows that the deeper Moho surface nearby the Chenghai fault and shallower nearby the Honghe fault; the isoline distribution of thickness changes greatly nearby the Chenghai fault and slowly nearby the Honghe fault. From the distribution of Poisson's ratios, it is unevenly in the study area with a great difference from the north part to the south part, which shows a characteristic of "lower in the north, higher in the south". The Poisson's ratio nearby the Honghe fault is medium too high (0.26 ≤ σ ≤ 0.29); lower nearby the Chenghai fault (σ ≤ 0.26). This paper concludes the possible reason of different characteristic between Poisson's ratio and crust thickness is thicker in the upper crust in the Binchuan region.
Key words:  Crustal thickness  Poisson's ratio  Receiver function  The Binchuan region