地震地质 ›› 2023, Vol. 45 ›› Issue (1): 190-207.DOI: 10.3969/j.issn.0253-4967.2023.01.011
杨建文1),2)(), 金明培1),2),*(
), 茶文剑1),2), 张天继1), 叶泵1),2)
收稿日期:
2022-04-02
修回日期:
2022-06-20
出版日期:
2023-02-20
发布日期:
2023-03-24
通讯作者:
* 金明培, 男, 1969年生, 正研级高级工程师, 硕士生导师, 现主要研究方向为地震监测预报、 接收函数、 震源模型等, E-mail: jmp69@263.net。
作者简介:
杨建文, 男, 1989年生, 2014年于昆明理工大学获测绘工程专业硕士学位, 工程师, 主要从事接收函数、 背景噪声成像等研究工作, E-mail: 928547602@qq.com。
基金资助:
YANG Jian-wen1),2)(), JIN Ming-pei1),2),*(
), CHA Wen-jian1),2), ZHANG Tian-ji1), YE Beng1),2)
Received:
2022-04-02
Revised:
2022-06-20
Online:
2023-02-20
Published:
2023-03-24
摘要:
文中基于2011年9月2日2014年1月16日小江断裂带及邻区48个台站的远震三分量波形数据提取径向P波接收函数, 采用两步反演法和Bootstrap重采样技术反演了各台站下方的S波速度结构, 对小江断裂带及邻区的地壳深部结构进行了研究。结果表明: 1)研究区地壳的S波速度在横向和垂向上都存在明显的非均匀特性, 近地表处有2~4km厚的低速沉积层; 中上地壳的S波速度呈高、 低速相间分布; 在20~35km的深度范围内存在明显的低速层, 主要间断分布于小江断裂以西的川滇菱形块体和红河断裂以南的印支块体内部, 另外在师宗-弥勒断裂附近也有局部分布。2)小江断裂带中、 北段壳内低速层较为发育, 以中段最为突出, 最厚约达28km; 南段在15~25km深度范围内存在明显的高速区。3)研究区的泊松比普遍较低(平均为0.24), 呈不均匀分布, 且横向变化剧烈, 小江断裂带的泊松比总体呈北段较高、 南段次之、 中段低的分段特征; 研究区壳内低速分布与泊松比间的对应关系不明显, 大部分低速层似乎缺少发生部分熔融的条件, 其地球物理结果的差异和不一致说明壳内低速层的变形演化机制及物理特性较为复杂。
中图分类号:
杨建文, 金明培, 茶文剑, 张天继, 叶泵. 利用接收函数两步反演法研究小江断裂带及邻区地壳S波速度结构[J]. 地震地质, 2023, 45(1): 190-207.
YANG Jian-wen, JIN Ming-pei, CHA Wen-jian, ZHANG Tian-ji, YE Beng. CRUSTAL S-WAVE VELOCITY STRUCTURE BENEATH THE XIAO-JIANG FAULT ZONE AND ADJACENT REGIONS REVEALED BY TWO-STEP INVERSION METHOD OF RECEIVER FUNCTIONS[J]. SEISMOLOGY AND GEOLOGY, 2023, 45(1): 190-207.
图1 a ChinArray Ⅰ期台站和云南区域台网台站分布; b 研究区的台站、 断层、 垂直剖面分布 F1罗茨-易门断裂; F2普渡河断裂; F3-1小江断裂西支; F3-2小江断裂东支; F4寻甸-宣威断裂; F5曲靖断裂; F6师宗-弥勒断裂; F7曲江断裂; F8石屏-建水断裂; F9红河断裂。 SYDB 川滇菱形块体; SCB华南地块; ICB 印支块体
Fig. 1 Stations distribution of ChinArray Phase Ⅰ and Yunnan regional seismic network(a), distribution of stations, faults, vertical profiles in the study area(b).
图3 53195台第1步低频(α=1.0)接收函数反演的波形拟合和解的不确定性评估 a 23个接收函数(黑色-灰色填充)和合成结果(红色虚线)的拟合情况; b 23个接收函数的S波反演结果; c 基于Bootstrap技术进行1000次重采样获得的最优解(红色粗实线)和95%的置信区间(蓝色细实线)
Fig. 3 Waveform fitting and solution uncertainty evaluation of the first-step low-frequency(α=1.0) receiver function inversion for station 53195.
图4 53195台第2步高频(α=2.5)接收函数反演的波形拟合和解的不确定性评估(子图说明见图3)
Fig. 4 Waveform fitting and solution uncertainty evaluation of the second-step high-frequency(α=2.5) receiver function inversion for station 53195(Same subgraph description as in Fig. 3).
图5 研究区4km、 10km、 16km、 22km、 30km和36km深度处的S波速度分布图(断裂说明见图1) 中红色圆圈为1900年以来的M≥6.0地震的震中分布
图b S-wave velocity distribution at the depths of 4km, 10km, 16km, 22km, 30km and 36km in the study areas(Same faults description as in Fig. 1).
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