藏北羌塘盆地中部地壳低速层分布与动力学意义

严江勇; 郑洪伟; 贺日政; 李娱兰; 李瑶; 牛潇

doi:10.3799/dqkx.2018.355

藏北羌塘盆地中部地壳低速层分布与动力学意义

doi: 10.3799/dqkx.2018.355

严江勇^1,2, ,,
郑洪伟²,
贺日政^1,2, ,,
李娱兰^1,2,3,
李瑶^1,4,
牛潇¹

1.
中国地质科学院深部探测中心, 国土资源部深部探测与地球动力学重点实验室, 北京 100037
2.
中国地质科学院地质研究所, 北京 100037
3.
中国地震局地球物理研究所地震观测与地球物理成像重点研究室, 北京 100081
4.
中国地震局地球物理研究所, 北京 100081

基金项目:

国家重点研发计划 2016YFC0600301

科技部深地资源勘查开采 2016YCF0600301

科技部深地资源勘查开采 2018YCF0604102

国家自然基金 41574086

国家自然基金 41761134094

中国地质调查项目 DD20160022-05

详细信息

作者简介:
严江勇(1992-), 硕士研究生, 主要从事地震学研究

通讯作者:
贺日政

中图分类号: P611
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- 文章访问数: 4540
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- PDF下载量: 35
- 被引次数: 0
出版历程
- 收稿日期: 2018-08-27
- 刊出日期: 2019-06-15

Low Velocity Layer Investigation in Central Qiangtang in North Tibet and Its Dynamic Implications

Yan Jiangyong^{1,2
,
,},
Zheng Hongwei²,
He Rizheng^{1,2
, ,},
Li Yulan^1,2,3,
Li Yao^1,4,
Niu Xiao¹

1.
China Deep Exploration Center of the Chinese Academy of Geological Sciences, Key Laboratory of Earth Probe and Geodynamics, Beijing 100037, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
4.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

摘要

摘要: 为了调查羌塘盆地中部壳内低速层分布特征，对布设在羌塘盆地的TITAN-Ⅰ宽频带地震台站所记录的远震波形数据进行接收函数分析，并引入时频域相位滤波技术改善接收函数信噪比，反演得到各台站下方100 km深度范围内的一维S波速度结构.结果表明，时频域相位滤波方法能够显著提高信噪比；羌塘盆地Moho深度为58±6 km，具有较高的泊松比值；中下地壳壳内低速层广泛分布，横向不连续，埋深在20~30 km，层厚6~12 km，剪切波速度为3.4±0.1 km/s；部分地区在埋深为10 km的中上地壳存在一层厚约4 km的低速薄层.羌塘盆地中下地壳壳内低速层是由于上涌的深部软流圈物质与下地壳发生大范围的接触，造成壳内及上地幔部分熔融引起的.
- 羌塘盆地 /
- 接收函数分析 /
- 时频域相位滤波 /
- 非线性反演一维S波速度结构 /
- 壳内低速层 /
- 地球物理
Abstract: In order to investigate the distribution characteristics of the low velocity layer in the central Qiangtang basin, this study conducted the TITAN-Ⅰ teleseismic receiver functions across the Qiangtang basin. And the signal-to-noise ratio of the receiver function was improved by the phase filtering technique in the time frequency domain. Finally, the one-dimensional S wave velocity structure in the depth of 100 km below each station is obtained by the nonlinear inversion of conjugate gradients algorithm for the complex spectrum ratios of receiver function. The results show that the phase filtering method in the time frequency domain can significantly improve the signal-to-noise ratio and make the one-dimensional S wave velocity structure of the subsequent inversion more reliable. The Moho depth of the Qiangtang basin is 58 ±6 km, and where has a higher Poisson's ratio. The low velocity layer in the mid-lower crust is widely distributed. The transverse discontinuity is discontinuous, and the depth is between 20 and 30 km, the thickness of the layer is 6-12 km, the shear wave velocity is 3.4±0.1 km/s. In some areas, there is a thin layer of 4 km thin layer in the mid-upper crust with a depth of 10 km. The low velocity layer in the mid-lower crust of the Qiangtang basin is caused by the deep mantle derived magma upwelling along the tectonic weak zone, resulting in partial melting in the mid-lower crust and upper mantle.
- Qiangtang basin /
- receive function analysis /
- time-frequency domain phase filter /
- nonlinear inversion of one-dimensional S wave velocity structure /
- crustal low-velocity layer /
- geophysics

HTML全文

图 1 羌塘盆地宽频带地震台站分布

图中三角形表示TITAN⁃Ⅰ项目台站，将其分为88.5°线、89.5°线以及东西线，其中蓝色三角形代表中下地壳存在低速层的台站；黑色粗实线表示INDEPTH⁃Ⅲ项目台站；BNS.班公湖⁃怒江缝合带，LSS.龙木错-双湖缝合带，LT.拉萨地体，SQT.南羌塘盆地，NQT.北羌塘盆地

Fig. 1. Distribution of seismological study in Qiangtang

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图 2 本文研究中远震事件震中分布

中间红色三角形为本文研究区；周围蓝色圆点为地震事件

Fig. 2. The earthquake distribution in this study

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图 3 时频域相位滤波前后对比

a.C008号台站接收函数；b. C008号台；站时频域相位滤波后接收函数C008号台站R分量P波接收函数S相位滤波前（a）后（b）对比

Fig. 3. (a) The receive function of P wave R component of C008; (b) shows phase filter in time⁃frequency domain output of the data from (a)

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图 4 时频域相位滤波前后细节对比

a1、b1、c1为时频域滤波前的记录，分别对应图 3a方框中的部分；a2、b2、c2为滤波后的记录，分别对应图 3b方框中的部分

Fig. 4. Detail contrast before and after phase filtering

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图 5 羌塘中部泊松比分布

黑色圆点是本文的结果；红色菱形是李永华等（2006）用INDEPTH⁃Ⅲ得到的结果；蓝色三角形是刘国成等（2014）H⁃K扫描得到的结果

Fig. 5. Poisson ratio in central Qiangtang

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图 6 部分台站接收函数波形拟合结果

上方波形是垂直分量（V）拟合结果，下方波形是径向分量（R）拟合结果.红色波形是原始波形，黑色波形是拟合波形，上面的数值代表拟合系数

Fig. 6. The result of nonlinear inversion for some seismic stations

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图 7 沿88.5°线台站下方地壳S波速度结构

黑线表示反演的速度结构，红线表示IASPEI91速度模型，台站由南向北排列

Fig. 7. The S wave velocity structure along the 88.5° line

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图 8 沿东西线台站下方S波速度结构

黑线表示反演的速度结构，红线表示IASPEI91速度模型，台站由西向东排列

Fig. 8. The S wave velocity structure along the west⁃east line

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图 9 沿89.5°线台站下方地壳S波速度结构

黑线表示反演的速度结构，红线表示IASPEI91速度模型，台站由南向北排列

Fig. 9. The S wave velocity structure along the 89.5° line

下载: 全尺寸图片幻灯片

表 1 台站位置及Moho深度和泊松比

Table 1. Locations of broadband stations and measured Moho depth and σ

台站	经度(°E)	纬度(°N)	Moho(±2 km)	σ(±0.001)	接收函数数量	台站	经度(E)	纬度(N)	Moho(±2 km)	σ(±0.001)	接收函数数量
C008	88.49	33.37	61.2	0.265	54	NQT04	89.26	33.12	58.6	0.335	33
C009	88.39	33.30	61.3	0.215	56	NQT06	89.19	33.20	58.6	0.335	48
C010	88.59	33.32	58.4	0.270	61	NQT08	88.48	33.47	58.3	0.305	30
C011	88.33	33.23	58.6	0.250	66	NQT10	88.53	33.56	58.4	0.260	34
C012	88.08	33.23	53.2	0.350	82	NQT12	88.54	33.66	61.2	0.310	32
C013	88.22	33.19	55.8	0.325	66	NQT14	88.78	33.83	53.9	0.350	21
C015	88.30	33.05	61.2	0.295	47	NQT16	88.78	33.93	53.8	0.335	31
C016	88.45	33.02	58.5	0.350	29	NQT18	88.71	33.96	61.1	0.250	22
C017	88.47	32.97	53.1	0.345	35	NQT20	88.63	34.03	61.1	0.310	21
C018	88.42	32.87	53.1	0.340	30	NQT22	88.64	34.11	61.1	0.270	45
C019	88.48	32.75	61.3	0.285	56	NQT24	88.62	34.23	61.2	0.275	54
C111	87.90	33.23	61.3	0.310	68	NQT26	88.58	34.31	61.2	0.285	52
C112	87.92	33.16	64.1	0.265	28	NQT28	88.56	34.41	61.3	0.290	51
C113	88.74	33.27	60.9	0.300	43	NQT30	88.62	34.50	55.9	0.340	53
C114	88.67	33.08	61.3	0.280	52	NQT32	88.66	34.61	55.8	0.345	64
EQT02	88.96	33.11	52.9	0.335	60	NQT34	88.46	34.71	61.3	0.295	52
EQT04	89.37	33.13	55.7	0.235	64	SEQT02	89.54	32.97	53.9	0.345	23
EQT06	89.53	33.08	61.1	0.315	44	SEQT04	89.64	32.88	53.0	0.350	24
EQT08	89.55	33.19	63.9	0.335	41	SEQTO6	89.70	32.78	58.8	0.345	31
EQT10	89.51	33.32	58.4	0.350	36	SEQT08	89.72	32.68	52.9	0.345	31
EQT12	89.53	33.41	53.2	0.350	39	SEQT10	89.76	32.59	61.2	0.295	29
EQT14	89.69	33.09	53.0	0.335	25	SEQT12	89.70	32.48	53.2	0.345	25
EQT16	89.81	33.13	61.3	0.285	27	SQT01	88.63	32.20	58.8	0.345	106
EQT18	89.88	33.20	58.5	0.305	26	SQT02	88.64	32.35	61.6	0.275	60
EQT20	90.02	33.23	61.2	0.295	21	SQT03	88.61	32.47	64.2	0.270	51
EQT22	90.15	33.25	61.1	0.290	21

下载: 导出CSV

表 2 中下地壳低速层分布情况

Table 2. Low velocity layer distribution in the mid⁃lower crust

台站号	顶面埋深(±0.5 km)	底面埋深(±0.5 km)	厚度(±1.0 km)	台站号	顶面埋深(±0.5 km)	底面埋深(±0.5 km)	厚度(±1.0 km)
SQT01	20	30	10	NQT20	20	30	10
SQT02	22	30	8	NQT22	20	29	9
SQT03	22	30	8	NQT26	20	30	10
C018	18	29	11	NQT28	24	34	10
C017	24	30	6	NQT32	19	30	11
C016	21	32	11	NQT34	19	29	10
C015	25	35	10	C012	20	30	10
C011	21	31	10	C013	22	30	8
C010	20	29	9	NQT06	20	28	8
C008	23	35	12	NQT04	22	31	9
NQT08	19	25	6	EQT10	19	31	12
NQT16	22	30	8

下载: 导出CSV

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