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Spatial-Temporal Characteristics of the Focal Mechanism Consistency in Zhangjiakou-Bohai Seismic Belt
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Xudong MA1, 2, Xiang WANG1, 2, Yi ZHOU1, 2, Dong MA1, 2
Journal of Geodesy and Geodynamics | 2025, 45(7) : 676 - 680, 711
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Journal of Geodesy and Geodynamics | 2025, 45(7): 676-680, 711
Spatial-Temporal Characteristics of the Focal Mechanism Consistency in Zhangjiakou-Bohai Seismic Belt
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Xudong MA1, 2, Xiang WANG1, 2, Yi ZHOU1, 2, Dong MA1, 2
Affiliations
  • 1 Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, 1540 West-Quanbei Street, Xingtai 054000, China
  • 2 Hebei Earthquake Agency, 262 Huaizhong Road, Shijiazhuang 050021, China

    • MA Xudong, engineer, majors in seismometry, E-mail:

About Author:

MA Xudong, engineer, majors in seismometry, E-mail:

Published: 2025-07-15 doi: 10.14075/j.jgg.2024.07.342
Outline
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Inverting the focal mechanism solutions of 708 earthquakes with ML≥2.0 from January 2009 to February 2023 along the Zhangjiakou-Bohai seismic zone(ZBSZ), we obtained the spatial-temporal distribution characteristics of focal mechanism consistency and the principal stress axes azimuths in this region. By integrating the groundwater level data from Majiagou mine in Tangshan, we analyzed the stress state of the study area. The results indicate that the azimuths of principal stress axes in the western and central sections of ZBSZ have been showing opposite change trends since 1978, while the azimuth in eastern sections has been increasing from 1966 to 2009 and slightly decreasing thereafter. Most of ML≥4.0 earthquakes in ZBSZ are located in areas with low stress tensor variance. Approximately 70% of ML≥3.0 earthquakes in the eastern sections of ZBSZ show a decrease in pre-shock misfit values, and stress enhancement phenomena occurred before several ML≥4.0 earthquakes around the Majiagou mine.

Zhangjiakou-Bohai seismic zone  /  focal mechanism  /  stress field  /  stress tensor variance  /  vertical stress
马旭东, 王想, 周依, 马栋. 张家口-渤海地震带震源机制一致性时空特征. 大地测量与地球动力学, 2025 , 45 (7) : 676 -680, 711 . DOI: 10.14075/j.jgg.2024.07.342
Xudong MA, Xiang WANG, Yi ZHOU, Dong MA. Spatial-Temporal Characteristics of the Focal Mechanism Consistency in Zhangjiakou-Bohai Seismic Belt[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (7) : 676 -680, 711 . DOI: 10.14075/j.jgg.2024.07.342
Funding
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  • The Spark Program of Earthquake Technology of Hebei Province(DZ2024112400002)
  • The Spark Program of Earthquake Technology of Hebei Province(DZ2023120800016)
  • The Spark Program of Earthquake Technology of Hebei Province(DZ2024111400001)
Appendix
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Year 2025 volume 45 Issue 7
34
14
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Article Info
doi: 10.14075/j.jgg.2024.07.342
  • Receive Date：2024-07-15
  • Online Date：2026-10-29
  • Published：2025-07-15
Article Data
Affiliations
History
  • Received：2024-07-15
Funding
The Spark Program of Earthquake Technology of Hebei Province(DZ2024112400002)
The Spark Program of Earthquake Technology of Hebei Province(DZ2023120800016)
The Spark Program of Earthquake Technology of Hebei Province(DZ2024111400001)
Affiliations
    1 Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, 1540 West-Quanbei Street, Xingtai 054000, China
    2 Hebei Earthquake Agency, 262 Huaizhong Road, Shijiazhuang 050021, China
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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