利用H/V方法研究琼北火山区的浅表层地质变化特征

doi:10.11978/2020148

热带海洋学报 ›› 2022, Vol. 41 ›› Issue (1): 184-193.doi: 10.11978/2020148CSTR: 32234.14.2020148

利用H/V方法研究琼北火山区的浅表层地质变化特征

曹佳俊^1,⁵(), 郭震², 夏少红^1,^3,⁴(), 张昌榕^1,^3,⁴, 吴晓阳², 任鹏飞²

1. 中国科学院边缘海与大洋地质重点实验室, 南海海洋研究所, 南海生态环境工程创新研究院, 广东广州 510301
2. 南方科技大学海洋科学与工程系, 广东深圳 518055
3. 南方海洋科学与工程广东省实验室(广州), 广东广州 511458
4. 三亚中科海洋研究院, 海南三亚 572022
5. 中国科学院大学, 北京 100049

收稿日期:2020-12-07 修回日期:2021-03-03 出版日期:2022-01-10 发布日期:2021-03-06
通讯作者: 夏少红
作者简介:曹佳俊(1995—), 男, 湖北省黄冈市人, 硕士研究生, 从事海洋地球物理研究。email: caojiajun18@mails.ucas.ac.cn
基金资助:
国家自然科学基金(42076071);国家自然科学基金(U1701641);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0204);广东特支计划本土创新创业团队项目(2019BT02H594);海南省重点研发计划项目(ZDYF2020198)

Shallow geological structure in the Qiongbei volcanic area by using H/V method

CAO Jiajun^1,⁵(), GUO Zhen², XIA Shaohong^1,^3,⁴(), ZHANG Changrong^1,^3,⁴, WU Xiaoyang², REN Pengfei²

1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
2. Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
3. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
4. Sanya Institute of Oceanology, South China Sea Institute of Oceanology, Sanya 572022, China
5. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-12-07 Revised:2021-03-03 Online:2022-01-10 Published:2021-03-06
Contact: XIA Shaohong
Supported by:
National Natural Science Foundation of China(42076071);National Natural Science Foundation of China(U1701641);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0204);Guangdong Key Project(2019BT02H594);Hainan Key Research and Development Project(ZDYF2020198)

摘要/Abstract

摘要：

海南琼北活火山作为华南沿海重要的第四纪火山, 一直受到国内外学者的广泛关注, 目前对该火山的形成演化已开展了大量深部地质结构的研究, 但对其表层地质结构特征仍然缺乏详细了解。水平-垂直频谱比法(简称H/V方法)已被广泛应用于浅表层地质结构的研究, 本文基于35个便携式微功耗地震仪组成的流动台阵观测数据, 采用经典全波场H/V_(full)和瑞利波椭圆率H/V_(Ray)分析方法, 获得了琼北火山区H/V曲线峰值频率(F₀)和放大倍数(A₀)的空间变化特征。琼北火山区H/V曲线峰值频率变化强烈, 以长流-仙沟断裂为界, 断裂西南侧很难从H/V曲线中获取清晰的F₀和A₀, 而断裂东北侧则存在明显的F₀和A₀。结合已有地质资料, 本文认为长流-仙沟断裂西南侧处于凹陷区, 其浅表层火山岩未发生明显的风化作用, 而东北侧位于隆起区域, 地表火山岩受到了比较严重的风化作用。这一研究结果表明, H/V方法可反映表层火山岩的风化状态, 火山岩出露场地H/V曲线的峰值频率和放大倍数随风化作用程度的增强而表现得更加明显。本研究为琼北火山区浅表火山岩风化状态和地震危险性评估提供了重要的信息支撑。

关键词: H/V方法, 琼北火山区, 背景噪声, 浅表层

Abstract:

The Hainan Qiongbei volcanic area is a typical Quaternary volcanic area in the coastal area of South China, which has attracted worldwide attention. Previous studies focused more on deep geological structures and the evolution of this volcano, but its surface geological structure is not yet well understood. Horizontal-to-vertical (H/V) spectrum of microtremors has been widely applied to shallow subsurface structures. By using classic full wave field H/V_(full) and the Rayleigh wave ellipticity H/V_(Ray) methods, we obtained spatial variation of peak frequency (F₀) and the amplification (A₀) from a seismic array of 35 short-period seismometers in the Qiongbei volcanic area. The results show that the peak frequency of the H/V curve in the Qiongbei volcanic area is significantly different on both sides of the Changliu-Xiangou fault. Clear F₀ and A₀ can be found at every site on the northeast side of the fault, while they do not exist on the opposite side of the fault. Based on the existing geological data, we believe that the shallow volcanic rocks at the southwest side of the Changliu-Xiangou fault have not undergone significant weathering under the condition of geological depression background, while the northeast side of the fault is located in an uplift area, so the rocks have been weathered seriously. Our results show that the H/V method can be used to evaluate the weathering state of surface volcanic rocks, and the peak frequency and amplification factor of the H/V curve of the outcropping site of the volcanic rocks are more obvious with the increasing of the degree of weathering. Our study provides important information for the weathering state of the volcanic rocks in the shallow and seismic risk assessment of this area.

Key words: H/V method, Qiongbei volcanic area, ambient noise, shallow geological structure

中图分类号:

P712.83

曹佳俊, 郭震, 夏少红, 张昌榕, 吴晓阳, 任鹏飞. 利用H/V方法研究琼北火山区的浅表层地质变化特征[J]. 热带海洋学报, 2022, 41(1): 184-193.

CAO Jiajun, GUO Zhen, XIA Shaohong, ZHANG Changrong, WU Xiaoyang, REN Pengfei. Shallow geological structure in the Qiongbei volcanic area by using H/V method[J]. Journal of Tropical Oceanography, 2022, 41(1): 184-193.

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类型	界面	厚度/m	V_p/(m·s^-1)	V_s/(m·s^-1)	密度/(kg·m^-3)
层Ⅰ	松散层	0~50	200~1600	100~800	1700~2200
层Ⅱ	半空间	0	1000~4000	500~2000	2100~2400

利用H/V方法研究琼北火山区的浅表层地质变化特征

Shallow geological structure in the Qiongbei volcanic area by using H/V method

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