基于地壳变形观测资料分析广义海原断裂运动状态

doi:10.12196/j.issn.1000-3274.2022.04.002

摘要/Abstract

摘要： 广义海原断裂包括冷龙岭断裂、金强河断裂、毛毛山断裂、老虎山断裂、海原断裂等几段, 地震地质研究认为该断裂不同断层段处于不同的孕震阶段。利用大地测量观测的地壳运动速率做约束, 通过反演确定现今上述各断层的运动状态。首先基于黏弹性地震周期变形模型计算广义海原断裂不同断层带的位移累积速率, 然后根据获得的结果与海原大地震的同震位移进行对比分析, 最后讨论该区域断裂带上不同孕震阶段的活动特征和运动状态。反演结果表明, 1920年海原8.5级地震发震断层闭锁程度整体较低; “天祝空段”的闭锁程度较高, 断层累积速率较小; 1888年景泰7级地震发震断层的闭锁程度也相对较高; 1990年景泰—天祝6.2级地震发震断层的闭锁程度相对较低; 广义海原断裂的整体速率由西向东呈阶段性分布, 位移累积速率与大地震的发震地区呈对应关系。

关键词: 广义海原断裂, GPS, 滑动速率, 黏弹性地震周期变形模型

Abstract: Generalized Haiyuan fault includes Lenglongling fault, Jinqianghe fault, Maomaoshan fault, Laohushan fault and Haiyuan fault. Seismic and geological studies show that different fault segments of this fault are in different seismogenic stages. In this paper, constrained by the velocity of crustal movement observed by geodesy, the movement states of the above faults are determined by inversion. Firstly, the slip rates of different fault zones of generalized Haiyuan fault are calculated based on the viscoelastic seismic periodic deformation model. Then, the results are compared with the coseismic displacements of the Haiyuan M8.5 earthquake. Finally, the activity characteristics and motion states of the fault zone in different seismogenic stages are discussed. The inversion results show that the lockout degree of the seismogenic fault of Haiyuan M8.5 earthquake in 1920 is relatively low. The “Tianzhu empty segment” has a high degree of locking and weak fault movement. The locking degree is relatively high for the seismogenic fault of the Jingtai M7 earthquake in 1888, while is low for that of the M6.2 earthquake in 1990. The overall sliding rate of the generalized Haiyuan fault area is distributed in stages from west to east, and the result of displacement accumulation rate is corresponding to the seismogenic region of large earthquakes.

Key words: Generalized Haiyuan fault, GPS, Slip rate, VECD model

中图分类号:

P315.7

王菲, 刁法启, 潘正洋, 邵志刚. 基于地壳变形观测资料分析广义海原断裂运动状态[J]. 地震, 2022, 42(4): 14-24.

WANG Fei, DIAO Fa-qi, PAN Zheng-yang, SHAO Zhi-gang. Analysis of the Generalized Haiyuan Fault Motion State Based on Crustal Deformation Observation Data[J]. EARTHQUAKE, 2022, 42(4): 14-24.

参考文献

[1] 邓起东.中国活动断裂[M]. 北京: 地震出版社, 1982.
DENG Qi-dong. Active faults in China[M]. Beijing: Seismological Press, 1982 (in Chinese).
[2] 谢富仁, 舒塞兵, 窦素芹, 等.海原、六盘山断裂带至银川断陷第四纪构造应力场分析[J]. 地震地质, 2000, 22(2): 139-146.
XIE Fu-ren, SHU Sai-bing, DOU Su-qin, et al. Quaternary tectonic stress field in the region of Haiyuan Liupanshan fault zone to Yinchuan fault depression[J]. Seismology and Geology, 2000, 22(2): 139-146 (in Chinese).
[3] 孙赫, 徐晶, 柳皓元.基于InSAR的广义海原断裂带中东段现今深部运动特征[J]. 大地测量与地球动力学, 2017, 37(11): 1141-1145.
SUN He, XU Jing, LIU Hao-yuan. Depth present-day movement in the mid-eastern segment of the Haiyuan fault zone based on InSAR[J]. Journal of Geodesy and Geodynamics, 2017, 37(11): 1141-1145 (in Chinese).
[4] 郑文俊, 袁道阳, 何文贵.祁连山东段天桥沟-黄羊川断裂古地震活动习性研究[J]. 地震地质, 2004, 26(4): 645-657.
ZHENG Wen-jun, YUAN Dao-yang, HE Wen-gui. Characteristics of Palaeo-earthquake activity along the active Tianqiaogou-Huangyangchuan fault on the eastern section of the Qilianshan mountains[J]. Seismology and Geology, 2004, 26(4): 645-657 (in Chinese).
[5] Gaudemer Y, Tapponnier P, Meyer B, et al. Partitioning of crustal slip between linked, active faults in the eastern Qilian Shan, and evidence for a major seismic gap, the ‘Tianzhu gap', on the western Haiyuan Fault, Gansu (China)[J]. Geophysical Journal International, 1995, 120(3): 599-645.
[6] 袁道阳, 刘百篪, 吕太乙, 等. 北祁连山东段活动断裂带的分段性研究[J]. 西北地震学报, 1998(4): 27-34.
YUAN Dao-yang, LIU Bai-chi, LÜ Tai-yi, et al. Study on the segmentation in east segment of the northern Qilianshan fault zone[J]. Northwestern Seismological Journal, 1998(4): 27-34 (in Chinese).
[7] 李彦宝, 甘卫军, 王阅兵, 等. 2016年门源M_S6.4强震的发震构造及其对“天祝地震空区”的影响[J]. 大地测量与地球动力学, 2017, 37(8): 792-796+829.
LI Yan-bao, GAN Wei-jun, WANG Yue-bing, et al. Seismogenic structure of the 2016 M_S6.4 Menyuan earthquake and its effect on the Tianzhu seismic gap[J]. Journal of Geodesy and Geodynamics, 2017, 37(8): 792-796+829 (in Chinese).
[8] 崔笃信, 王庆良, 胡亚轩, 等. 用GPS数据反演海原断裂带断层滑动速率和闭锁深度[J]. 地震学报, 2009, 31(5): 516-525.
CUI Du-xin, WANG Qing-liang, HU Ya-xuan, et al. Inversion of GPS data for slip rates and locking depths of the Haiyuan fault[J]. Acta Seismologica Sinica, 2009, 31(5): 516-525 (in Chinese).
[9] 刁法启, 汪荣江, 熊熊. 基于大地测量资料的震间断层变形模型: 从弹性到粘弹[C]. 2019年中国地球科学联合学术年会, 2019.
DIAO Fa-qi, WANG Rong-jiang, XIONG Xiong. Interseismic fault deformation model based on geodetic data: from elastic to viscoelastic[C]. 2019 Annual Conference of Chinese Geosciences Union, 2019.
[10] Wang M, Shen Z K. Present-day crustal deformation of continental China derived from GPS and its tectonic implications[J]. Journal of Geophysical Research: Solid Earth, 2020, 125(2): e2019JB018774.
[11] Diao F Q, Xiong X, Wang R J, et al. Slip rate variation along the Kunlun fault (Tibet): Results from new GPS observations and a viscoelastic earthquake-cycle deformation model[J]. Geophysical Research Letters, 2019, 46(5): 2524-2533.
[12] Savage J C, Burford R O. Geodetic determination of relative plate motion in central California[J]. Journal of Geophysical Research, 1973, 78(5): 832-845.
[13] Savage J C, Prescott W H. Precision of geodolite distance measurements for determining fault movement[J]. Journal of Geophysical Research, 1973, 78(26): 6001-6008.
[14] Scholz C H. Earthquakes and friction laws[J]. Nature, 1998, 391(6662): 37-42.
[15] Madariaga R, Métois M, Vigny C, et al. Central Chile finally breaks[J]. Science, 2010, 328(5975): 181-182.
[16] Hashimoto C, Noda A, Sagiya T, et al. Interplate seismogenic zones along the Kuril-Japan trench inferred from GPS data inversion[J]. Nature Geoscience, 2009, 2: 141-144.
[17] Schurr B, Asch G, Hainzl S, et al. Gradual unlocking of plate boundary controlled initiation of the 2014 Iquique earthquake[J]. Nature, 2014, 512(7514): 299-302.
[18] Jiang W L, Han Z J, Guo P, et al. Slip rate and recurrence intervals of the east Lenglongling fault constrained by morphotectonics: Tectonic implications for the northeastern Tibetan Plateau[J]. Lithosphere, 2017, 9(3): 417-430.
[19] 王敏. GPS观测结果的精化分析与中国大陆现今地壳形变场研究[D]. 北京: 中国地震局地质研究所, 2009.
WANG Min. Aanalysis of GPS data with high precision study on present-day crustal deformation in China[D]. Beijing: Institute of Geology, China Earthquake Administration, 2009 (in Chinese).
[20] Qiao X, Qu C Y, Shan X J, et al. Interseismic slip and coupling along the Haiyuan fault zone constrained by InSAR and GPS measurements[J]. Remote Sensing, 2021, 13(16): 3333.
[21] Li C Y, Zhang P Z, Yin J H, et al. Late Quaternary left-lateral slip rate of the Haiyuan fault, northeastern margin of the Tibetan Plateau[J]. Tectonics, 2009, 28(5): TC5010.
[22] 环文林, 葛民, 常向东.1920年海原8½级大地震的多重破裂特征[J]. 地震学报, 1991, 13(1): 21-31.
HUAN Wen-lin, GE Min, CHANG Xiang-dong. Multiple rupture characteristic of the 1920 Haiyuan M8½ earthquakes[J]. Acta Seismologica Sinica, 1991, 13(1): 21-31 (in Chinese).
[23] Zhang P Z, Min W, Deng Q D, et al. Paleoearthquake rupture behavior and recurrence of great earthquakes along the Haiyuan fault, northwestern China[J]. Science in China (Series D: Earth Sciences), 2005, 48(3): 364-375.
[24] Jolivet R, Candela t, Lasserre C, et al. The burst-like behavior of aseismic slip on a rough fault: The creeping section of the Haiyuan fault, China[J]. Bulletin of the Seismological Society of America , 2015, 105(1): 480-488.
[25] Jolivet R, Lasserre C, Doin M P, et al. Spatio-temporal evolution of aseismic slip along the Haiyuan fault, China: Implications for fault frictional properties[J]. Earth and Planetary Science Letters , 2013, 377-378: 23-33.
[26] Jolivet R, Lasserre C, Doin M P, et al. Shallow creep on the Haiyuan fault (Gansu, China) revealed by SAR interferometry[J]. Journal of Geophysical Research, 2012, 117: B06401.
[27] Cavalié O, Lasserre C, Doin M P, et al. Measurement of interseismic strain across the Haiyuan fault (Gansu, China), by InSAR[J]. Earth and Planetary Science Letters, 2008, 275(3-4): 246-257.
[28] 郝明, 李煜航, 秦珊兰. 基于GPS数据的海原—六盘山断裂带滑动速率亏损时空分布[J]. 地震地质, 2017, 39(3): 471-484.
Hao M X, Li Y H, Qin S L. Spatial and temporal distribution of slip rate deficit across Haiyuan-Liupanshan fault zone constrained by GPS data[J]. Seismology and Geology, 2017, 39(3): 471-484 (in Chinese).
[29] 甘卫军, 刘百篪. 景泰—天祝断裂单元与多重特征地震的危险性概率评估[J]. 地震地质, 2002, 24(1): 45-58.
Gan W J, Liu B C. Probability of large earthquake recurrence along the Jingtai-Tianzhu active fault[J]. Seismology and Geology, 2002, 24(1): 45-58 (in Chinese).
[30] 邵志刚, 张浪平, 马宏生, 等.基于形变观测分析2011年日本9.0级地震与断层运动间关系[J]. 地球物理学报, 2015, 58(3): 857-871.
SHAO Zhi-gang, ZHANG Lang-ping, MA Hong-sheng, et al. The analysis of the relationship between Japanese M_W9.0 earthquake on March 11, 2011 and the fault movement based on the GPS observation[J]. Chinese Journal of Geophysics, 2015, 58(3): 857-871 (in Chinese).