台湾海峡6.2级地震震区气枪地震资料初步分析

闫培; 刘善虎; 张艺峰; 王笋

doi:10.11899/zzfy20210311

台湾海峡6.2级地震震区气枪地震资料初步分析

doi: 10.11899/zzfy20210311

1.
福建省地震局，厦门地震勘测研究中心，福建厦门 361021
2.
中国地震局厦门海洋地震研究所，福建厦门 361021

基金项目: 福建省地震局青年科技基金专项（Y202003）

详细信息

作者简介:
闫培，男，生于1984年。高级工程师，硕士。主要从事海洋地震探测及地震数据处理工作。E-mail：yanpeisea@126.com

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出版历程
- 收稿日期: 2021-01-07
- 刊出日期: 2021-09-30

The Preliminary Analysis of Airguns Seismic Data in the M_S6.2 Taiwan Strait Earthquake Region

1.
Earthquake Administration of FuJian Province, Research Center of Earthquake Reconnaissance in Xiamen, Xiamen 361021, Fujian, China
2.
Xiamen Marine Seismology Institute, China Earthquake Administration, Xiamen 361021, Fujian, China

摘要

摘要: 对2019年在台湾海峡6.2级地震震区布设的N01、NE02测线地震测深剖面的Pg波走时进行层析成像反演，获得测线下方地壳上部二维速度结构。对N01测线单道反射地震测深剖面进行多次波衰减等处理，并与Pg波成像结果进行对比。研究结果表明，采用走时层析成像方法与单道反射地震测深剖面获得沿探测剖面沉积层上地壳基底形态特征等具有较好的对应关系。由于测线穿越多个地质构造单元和多条断裂带，走时层析成像和单道反射地震测深剖面结果综合显示研究区结晶基底面起伏较大，沉积层速度和厚度变化较剧烈，受台湾海峡西部新生代构造活动影响，显示了相应的断裂或不同地质构造单元在上部地壳内的结构特征。
- 台湾海峡 /
- 深地震探测 /
- 基底结构 /
- 地震剖面
Abstract: The Pg wave travel time of N01 and NE02 deep seismic sounding profiles laid in the MS6.2 Taiwan Strait earthquake region in 2019 was inverted by tomography, and the two-dimensional velocity structure of the upper crust below the survey lines was obtained. The N01 single seismic section was processed by multiple attenuation, and compared with the Pg wave imaging results, there is a good correspondence between the morphological characteristics of the basement. As the survey lines pass through multiple geological tectonic units and multiple fault zones, the results of tomography and single seismic section show that the crystalline basement surface in the study area fluctuates greatly, and the velocity and thickness of the sedimentary layer changes violently. Affected by cenozoic tectonic activities in the western Taiwan Strait, it shows the structural characteristics of the corresponding faults or different geological tectonic units in the upper crust.
- Taiwan strait /
- Deep seismic exploration /
- Basement structure /
- Seismic profile

HTML全文

图 1 福建及台湾海峡地质构造

Figure 1. Geological structure of Fujian province and Taiwan strait

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图 2 N01、NE02测线位置

Figure 2. Location of N01 and NE02 lines

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图 3 Pg波时距曲线

Figure 3. Pg wave time curve

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图 4 Pg波速度模型

Figure 4. Pg wave velocity model

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图 5 单道地震资料处理方法

Figure 5. Single seismic channel data processing method

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图 6 N01测线剖面基底二维速度结构

Figure 6. The basement two-dimensional velocity structure of N01 profile

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图 7 NE02测线剖面基底二维速度结构

Figure 7. The basement two-dimensional velocity structure of NE02 profile

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图 8 N01测线单道反射地震测深剖面

Figure 8. N01 single channel seismic profile

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图 9 N01测线剖面基底速度扰动

Figure 9. The basement velocity disturbance of N01 profile

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图 10 NE02测线剖面基底速度扰动

Figure 10. The basement velocity disturbance of NE02 profile

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