CT理论与应用研究2025，Vol.34Issue(5)：790-802,13.DOI:10.15953/j.ctta.2025.206
基于体波走时反演的南迦巴瓦构造结三维地壳结构
Three-dimensional Crustal Structure of the Namche Barwa Massif on the Basis of Travel-time Imaging of Body Waves
摘要
Abstract
The Namche Barwa massif is located in the core area of the eastern Himalayan syntaxis.This area is located at the junction of the Eurasian plate,Indian plate and Myanmar block.It is the key part of the southeastward lateral strike-slip extrusion and 90° deflection of the plate boundary on the Tibetan Plateau.It is also the region with the strongest tectonic stress and the fastest uplift rate and denudation.It is of great significance to study the velocity structure of this area to understand the mechanism of earthquake preparation.On the basis of the dense array data of 374 short-period nodal seismometers deployed in the Namche Barwa area between June 14 and July 24,2020,in combination with the data of the regional seismic network from 2009 to 2024,the double-difference tomography method was used in this study to obtain the velocity structure characteristics and precise relocation of earthquake results of Namche Barwa and its vicinity.The results show the north and east sides of the Namche Barwa peak are located in the high-velocity anomaly area,whereas the southwest side is located in the low-velocity anomaly area.At a depth of 10km with high resolution,the P-wave velocity structure in the middle section of the Jiali fault changed from high-velocity anomaly to low-velocity anomaly.The trend of P-wave and S-wave high-velocity and low-velocity anomaly areas is consistent with the trend of the main active fault zones.From a depth of 5km,the wave velocity ratio of the Namche Barwa massif and its vicinity is low,and the phenomenon is more significant with the increase in depth.关键词
南迦巴瓦构造结/双差层析成像/三维速度结构/米林地震Key words
The Namche Barwa massif/double-difference tomography/three-dimensional velocity structure/milin earthquake分类
天文与地球科学引用本文复制引用
李敏娟,沈旭章,马海萍,刘白云,宋婷,刘谨瑞,谭家炜,陈枭,窦喜英..基于体波走时反演的南迦巴瓦构造结三维地壳结构[J].CT理论与应用研究,2025,34(5):790-802,13.基金项目
国家自然基金重点项目(祁连造山带深部结构与晚新生代构造变形研究(42230305)) （祁连造山带深部结构与晚新生代构造变形研究(42230305）
第二次青藏高原综合科学考察研究(关键地区岩石圈精细结构与浅部响应(20190ZKK0701)) （关键地区岩石圈精细结构与浅部响应(20190ZKK0701）
中央级公益性科研院所基本业务费专项(2023年甘肃积石山Ms6.2地震上地壳P波速度结构分析与深部孕震环境研究(LISCEA202401)) （2023年甘肃积石山Ms6.2地震上地壳P波速度结构分析与深部孕震环境研究(LISCEA202401）
中央级公益性科研院所基本业务费专项(两次门源强震前后冷龙岭断裂变形特征研究(LISCEA202402)) （两次门源强震前后冷龙岭断裂变形特征研究(LISCEA202402）
地震监测预报预警工作任务(地震精定位结果自动产出流程研发——以积石山6.2级地震为例(CEA-ZQGZ-202501047)) （地震精定位结果自动产出流程研发——以积石山6.2级地震为例(CEA-ZQGZ-202501047）
2022年度甘肃省高等学校创新基金(中强地震危险性综合概率评估系统研发及应用_以甘肃地区为例(2022A-213)). （中强地震危险性综合概率评估系统研发及应用_以甘肃地区为例(2022A-213）
