基于潜在破裂面源模型的南北地震带南段地震区划研究

胥广银; 高孟潭

doi:10.11899/zzfy20170301

基于潜在破裂面源模型的南北地震带南段地震区划研究

doi: 10.11899/zzfy20170301

中国地震局地球物理研究所, 北京 100081

基金项目:

中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项 DQJB11C19

详细信息

作者简介:
胥广银, 男, 生于1971年。博士, 副研究员。主要从事地震活动性分析、地震危险性分析及地震区划等方面的研究。E-mail:xugy1971@163.com

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出版历程
- 收稿日期: 2017-04-22
- 刊出日期: 2017-09-01

Seismic Zoning in Southern Part of North-South Seismic Belt Based on the Potential Rupture Surface Source Model

Institate of Geophysics, China Earthquake Administration, Beijing 100081, China

摘要

摘要: 南北地震带南段大震活动频繁。已有的研究结果表明，大震近场范围场点的地震危险性与地震破裂面产状及其尺度密切相关。因此，在南北地震带南段需要考虑潜在震源三维特征进行地震危险性分析和地震区划研究。本文在充分搜集大震发震构造资料的基础上，在南北地震带南段构建了考虑震源尺度和产状的潜在震源模型，改进了地震危险性概率分析方法，进而对该地区进行地震区划研究。结果表明，考虑潜在震源三维特征的地震危险性分析结果可以有效地反映南北地震带南段发震构造的产状和尺寸特征，提高地震区划结果的合理性。
- 南北地震带南段 /
- 潜在地震破裂面源模型 /
- 地震危险性分析 /
- 地震区划
Abstract: There are many large earthquake actives recorded in the southern part of North-South seismic belt. The seismic hazard near the potential large earthquake source is related to size and attitude of potential ruptures according to the recent studies. So, the 3-D characteristics of potential sources should be considered to analyze the seismic hazard near the large faults that have the possibility to generate great earthquakes. In this study, the plenty of data of strong earthquake and seismo-tectonics are collected and the potential rupture surface source model are constructed to consider the size and attitude of large earthquakes, in order to make the seismic hazard analysis results more reasonable in the southern part of North-South seismic belt. From this study, we conclude that the seismic zoning results show the spatial characteristic, such as attitude and size of seismogenic structures, so it makes the results of the seismic hazard analysis and seismic zoning more reasonable in the southern part of North-South seismic belt.
- Southern part of North-South seismic belt /
- Potential rupture surface source model /
- Seismic hazard analysis /
- Seismic zoning

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图 1 考虑三维空间特征的潜在地震破裂面源模型示意图

Figure 1. The sketch diagram of potential seismic rupture surface model considering the 3-D characteristics

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图 2 地震破裂面及其对场点地震危险性贡献的计算示意图

Figure 2. Calculation sketch diagram of earthquake rupture surface and its contribution to earthquake rish of site

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图 3 区域地震构造简图

Figure 3. Sketch map of the regional seismo-tectonics

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图 4 研究区潜在地震破裂面源划分图

Figure 4. Distribution of the potential rupture surface sources in research area

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图 5 基岩峰值加速度区划与地震构造对比（50年超越概率10%）

Figure 5. Comparison between peak ground acceleration zoning map and seismogenic structures (with 10% in 50 years)

下载: 全尺寸图片幻灯片

图 6 基岩峰值加速度区划与地震构造对比

Figure 6. Comparison between peak ground acceleration zoning map and seismogenic structures

下载: 全尺寸图片幻灯片

表 1 潜在地震破裂面源划分表

Table 1. The regional potential rupture surface sources

编号	潜在地震破裂面源名称	震级上限	走向	倾向	倾角/°
1	曲江断裂	8.0	NW	NE/SW	近直立
2	石屏-建水断裂	7.5	NW	NE	70
3	红河断裂南东段	7.0	NW	NE	65
4	红河断裂北西段	7.5	NNW	NEE	65
5	小江断裂南段东支	8.0	NS	E	70
6	小江断裂南段西支	8.0	NS	E	70
7	小江断裂北段	8.0	NNW	NEE	70
8	则木河断裂	8.0	NW	NE	70
9	程海断裂	8.0	NNE	W	80
10	丽江断裂	7.5	NE	SE	65
11	普渡河断裂	6.5	NS	E/W	近直立
12	汤郎-易门断裂	6.5	NS	E/W	近直立
13	元谋-绿汁江断裂	6.5	NS	E/W	近直立
14	南华-楚雄断裂	6.5	NW	NE	近直立
15	无量山断裂	6.5	NNW	NEE	80

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表 2 各地震带地震活动性参数

Table 2. Seismicity parameters of seismic belts

地震带	震级上限M_u	4级以上地震年平均发生率v₄	b值
鲜水河-滇东地震带	8	32	0.85
滇西南地震带	8	20	0.77

下载: 导出CSV

表 3 基岩加速度峰值衰减关系各项系数表

Table 3. The parameters of peak ground acceleration attenuation relationship

系数	C₁	C₂	C₃	C₄	C₅	C₆	σ_lgSa
长轴	0.537	1.167	－0.051	－2.170	2.170	0.383	0.232
短轴	－0.760	1.068	－0.046	－1.490	0.264	0.530	0.232

下载: 导出CSV

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