云南地区尾波Qc值的分布特征及其初步解释

地震 ›› 2006, Vol. 26 ›› Issue (3): 37-43.

云南地区尾波Q_c值的分布特征及其初步解释

马宏生^1,2, 刘杰³, 张国民¹, 王新岭¹, 王伟君¹, 王辉¹

1.中国地震局地震预测研究所, 北京 100036;
2.中国地震局地球物理研究所, 北京 100081;
3.中国地震台网中心, 北京 10036

收稿日期:2005-12-23 修回日期:2006-02-15 发布日期:2021-11-01
作者简介:马宏生(1976-), 男, 新疆和静县人, 2004年在读博士研究生, 主要从事强震机理和地震预测等研究。
基金资助:
科技部社会公益项目(2004DIA3J010);地震科学联合基金(106016)

The distribution characteristics and its elementary interpretation of Coda Q_c in Yunnan Region

MA Hong-sheng¹, LIU Jie², ZHANG Guo-min¹, WANG Xin-ling¹, WANG Wei-jun¹, WANG Hui¹

1. Institute of Earthquake Science, CEA, Beijing 100036;
2. China Earthquake Networks Center, CEA, Beijing 100036, China

Received:2005-12-23 Revised:2006-02-15 Published:2021-11-01

摘要/Abstract

摘要： 利用云南地区22个区域数字地震台站记录到的, 自1999年下半年至2003年年底的5668个地震数字波形资料, 采用Sato单次散射模型, 计算了各台站周围50 km内1371条地震记录的尾波Q_c值。依据Q₀和η值的不同, 将得到的Q_c值进行分类。其分类结果显示云南地区的介质结构具有区域性分布特征, 而且可以从地质构造、地震活动以及大地热流分布等方面对其予以初步解释。结果表明, 在构造复杂、活动强烈的滇中块体及其周边变形带上的Q_c值显著小于构造活动一般的其他区域; 就地震活动性而言, 高Q_c值的区域通常没有地震发生或者仅仅发生较低震级的地震, 而低Q_c值的区域则有较大地震发生; 此外, 云南地区Q_c值的分布与大地热流分布也有负对应关系, 即高热流区域的Q_c值低, 低热流区域的Q_c值高。

关键词: 尾波Q_c, Sato单次散射模型, 区域性分布, 云南地区

Abstract: The coda-wave attenuation quality factor Q_c in Yunnan region is estimated using the single-scattering attenuation model of Sato based on 5668 local seismic events recorded by 22 regional digital seismic stations from the later half of 1999 to 2003. The events used in this paper are situated within epicentral distances of 50 km. According to the variation of Q₀ and η, we classified the quality factor Q_c into two types. The classified results show that there are regional distribution characteristics in medium structure in Yunnan region, and the characteristics could be elementarily interpreted by geological structures, seismic activity and heat flow. Generally speaking, the quality factor Q_c in Dianzhong center Yunnan region Block and its boundary area is notably less than that in other regions, where the tectonic activity isn't intense. According to seismic activity, there are large earthquakes in the areas with lower Q_c, and there are few or only some little earthquakes in the areas with higher Q_c. Besides, there is negative relation between quality factor Q_c and heat flow in Yunnan region, namely higher heat flow corresponds to lower Q_c and lower heat flow corresponds to higher Q_c.

Key words: Yunnan region, Coda Q_c, Sato's single-scattering attenuation model, Regional distribution

中图分类号:

P315.7

马宏生, 刘杰, 张国民, 王新岭, 王伟君, 王辉. 云南地区尾波Q_c值的分布特征及其初步解释[J]. 地震, 2006, 26(3): 37-43.

MA Hong-sheng, LIU Jie, ZHANG Guo-min, WANG Xin-ling, WANG Wei-jun, WANG Hui. The distribution characteristics and its elementary interpretation of Coda Q_c in Yunnan Region[J]. EARTHQUAKE, 2006, 26(3): 37-43.

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