中国大陆活动断层古地震及强震复发特征研究

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Yao-Hu Zhang, Hua Pan, Jiang Cheng, Meng Zhang
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引用次数: 0

摘要

古地震研究是确定大地震复发间隔的重要方法。合理确定平均复发间隔和变异系数,为分析中国大陆板内断层强震的复发特征提供了重要依据。本文收集、整理和分析了中国大陆 93 条研究较好的断层的 145 个断层段的古地震资料,探讨了强震发生概率模型的平均重现间隔和变异系数的合理估算。首先,以构造环境差异为基础,研究了强震平均重现间隔的空间分布特征。结果表明,川滇构造带、新疆构造带、华北构造带和青藏高原东北部构造带的强震重现期存在明显差异。川滇构造带的强震平均重现期最短,主要分布在 100 至 2000 年之间,且滑移率相对较高。新疆构造带的重现间隔频率分布相对均衡,为 1000-4500 年,滑移率适中。华北构造带的滑移率最低,强震重现间隔主要集中在 1000-4000 年之间。青藏高原东北部构造带在 1000-3000 年和 3000-5000 年之间出现了两个主要的强震重现间隔频率峰,滑移率相对较高。滑移率是影响强震复发间隔的关键因素,高滑移率的活动断层复发间隔较短。此外,还研究了断层滑移率、断层类型和强震平均重现间隔之间的关系。结果表明,断层滑移率与大地震的平均重现间隔之间存在良好的对数线性关系--滑移率越高,强地震的重现间隔越短。断层类型与平均重现间隔也有一定关系,各类活动断层的重现间隔依次为走向滑动断层、正常断层、逆走向滑动断层、逆断层、正常走向滑动断层,并逐渐增大。其次,我们计算了各构造带中重现期变异系数小于 0.4 的活动断层和各类断层的比例。研究结果表明,中国大陆大部分活动断层的强震发生符合准周期模型。不同构造带和断层类型的一般变异系数在 0.36 至 0.44 之间,表明不同构造带和断层类型的强震发生周期变异程度差异不大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on Paleoearthquake and Recurrence Characteristics of Strong Earthquakes in Active Faults of Mainland China

Paleoearthquake research represents an essential method for determining recurrence intervals of large earthquakes. Reasonable determination of the average recurrence interval and coefficient of variation provides a crucial basis for the analysis of the recurrence characteristics of strong earthquakes on intraplate faults in Mainland China. Paleoearthquake data from 145 fault segments of 93 well-studied faults in Mainland China were collected, organized, and analyzed to discuss the rational estimation of the average recurrence interval and coefficient of variation of a strong earthquake occurrence probability model. First, differences in structural environments were used as a basis to investigate the spatial distribution characteristics of the average recurrence intervals of strong earthquakes. The results indicate significant variations in the recurrence periods of strong earthquakes in the Sichuan–Yunnan, Xinjiang, North China, and northeastern Tibetan Plateau structure zones. The Sichuan–Yunnan structure zone exhibited the shortest average recurrence interval for strong earthquakes, which was mainly distributed between 100 and 2000 years, and a relatively high slip rate. The Xinjiang structure zone attained a relatively balanced recurrence interval frequency distribution of 1000–4500 years and a moderate slip rate. The North China structure zone showed the lowest slip rate, with the strong earthquake recurrence interval mainly concentrated between 1000 and 4000 years. The northeastern Tibetan Plateau structure zone presented two main frequency peaks in the strong earthquake recurrence intervals between 1000–3000 years and 3000–5000 years and a relatively high slip rate. The slip rate is a key factor influencing the recurrence interval of strong earthquakes, and active faults with high slip rates show short recurrence intervals. Furthermore, the relationship between fault slip rate, fault type, and the average recurrence interval of strong earthquakes was examined. The results indicate a good logarithmic linear relationship between the fault slip rate and the average recurrence interval of large earthquakes—the higher the slip rate, the shorter the recurrence interval of strong earthquakes. Fault type also showed a relation to the average recurrence interval, with the intervals for various types of active faults gradually increasing in the order of strike-slip, normal, reverse strike-slip, reverse, and normal strike-slip faults. Second, we calculated the proportions of active faults and various fault types in each structure zone that had a coefficient of variation in recurrence intervals less than 0.4. The findings reveal that the occurrence of strong earthquakes on most active faults in Mainland China satisfies a quasiperiodic model. The general coefficient of variation across different structure zones and fault types ranges between 0.36 and 0.44, which indicates the nonsignificant difference in the degree of variability in the periodicity of strong earthquake occurrence across various structural zones and fault types.

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来源期刊
Applied Geophysics
Applied Geophysics 地学-地球化学与地球物理
CiteScore
1.50
自引率
14.30%
发文量
912
审稿时长
2 months
期刊介绍: The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.
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