广西及邻区构造应力场分区研究
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作者单位:

1.防灾科技学院地球科学学院;2.河北省地震动力学重点实验室;3.成都理工大学地球物理学院

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中图分类号:

P315.2

基金项目:

国家自然科学基金(42174074,41674055);中央高校科研业务费专项(ZY20215117);河北省地震动力学重点实验室开放资助(FZ212105)


Study of tectonic stress field in Guangxi and surrounding areas
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1.College of Earth Sciences, Institute of Disaster Prevention;2.Hebei Key Laboratory of Earthquake Dynamics;3.College of Geophysics, Chengdu University of Technology

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    摘要:

    广西位于构造相对稳定的华南地块,仪器观测的地震活动相对较弱,观测资料少导致该地区的地壳应力场等相关研究较为薄弱。2019年该区发生了北流5.2级地震序列,积累了相当的震源机制资料,改善了该地区的震源机制资料较少的现状,本文搜集该地震的震源机制资料并整理了前人的相关资料,对广西及邻区的震源机制类型进行统计,并采用网格搜索法反演了该区域应力场总场和分区应力场。结果表明:(1)该地区的震源机制解以走滑型为主,从NW往ES方向的分布看,逆断型震源机制解逐渐增多,正断型震源机制解逐渐减少;(2)总体应力场的主压应力轴NW-SE向,主张应力轴为NE-SW向,且两轴接近水平,整体应力场为走滑型;(3)西部地区主压应力轴方向为近N-E向,往东部主压应力轴方向逐渐向NW-SE方向变化,使得各分区主压应力方向在整体区域上呈扇形分布特征。(4)根据各分区应力场结果得出:a区域内最易产生NE-SW向和NW-SE向的断裂,断裂类型以走滑型为主;b区域最易产生NNE-SSW向和NWW-SEE向断裂,其中NNE-SSW向断裂更偏向于逆走滑型,NWW-SEE向断裂更偏向于走滑型;c区域最易产生正N-S向和正E-W向断裂,受周围区域断裂延伸影响,该区域的主要断层并未体现这一特征,断裂类型以逆走滑型和逆断型为主;d区域最易产生NW-SE向和NE-SW向断裂,其中NW-SE向断裂更偏向于逆断型,NE-SW向断裂更偏向于走滑型。

    Abstract:

    Guangxi is located in the South China block, its structure is relatively stable, the seismic activity observed by the instrument is relatively weak. The little observation data leads to weak research on the crustal stress field in the area. In 2019, the Beiliu earthquake sequence occurrence in this area leads to the accumulation of considerable focal mechanism data. In this study, the focal mechanism data are collected in Guangxi and its adjacent areas. Using the grid search algorithm, the stress field in overall region and subregions were inverted. The findings indicate that: (1) The statistics of the focal mechanism in this area is mainly strike-slip type, and from the distribution of NW to ES, the focal mechanism of the reverse type gradually increases, and the focal mechanism of the normal fault type gradually decreases; (2) the principal compressive stress axis of the overall stress field is NW-SE direction, the principal extensional stress axis is NE-SW direction, both of them are close to horizontal, which representing strike-slip type; (3) The direction of the principal compressive stress axis in the western region is close to the N-E direction, and that in the east gradually changes to the direction of NW-SE, which makes the pattern of the com-pressive stress direction present a fan-shaped in the overall area. (4) Based on the stress field analysis of subregions: NE-SW and NW-SE faults are easily generated in region-a by primarily of strike-slip type; NNE-SSW and NWW-SEE faults are easily generated in region-b, with NNE-SSW faults more towards reverse strike-slip type and NWW-SEE faults tending towards strike-slip type; Pure azimuth N-S and E-W faults are easily generated in region-c, but its main fault properties are not reflected due to the influence of surrounding fault extensions, with faults mainly of reverse strike-slip and reverse fault types; NW-SE and NE-SW faults are easily generated in region-d, with NW-SE faults more towards reverse fault and NE-SW faults tending towards strike-slip.

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郑礼洋,万永革. 广西及邻区构造应力场分区研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-23
  • 最后修改日期:2024-06-10
  • 录用日期:2024-06-19
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