| 2000年姚安地震的震源参数 |
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| 引用本文： | 秦嘉政,叶建庆,钱晓东,李白基,王绍晋.2000年姚安地震的震源参数[J].地球物理学报,2003,46(5):633-641. |
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| 作者姓名： | 秦嘉政 叶建庆 钱晓东 李白基 王绍晋 |
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| 作者单位： | 云南省地震局,昆明 650041 |
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| 基金项目： | 云南省重点科技攻关项目 (NG2 0 0 1)，国家重点基础研究发展规划 973项目 (95 13 0 5 0 5 ) |
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| 摘 要： | 根据近场小孔径观测台网记录的余震序列资料，研究了2000年1月15日云南姚安MS6.4地震序列的地震物理过程. 用地震标定律关系估算主震的地震矩M0=1.58×1018N·m，矩震级MW=6.0，平均位错=0.63m，断层长度L=16.6km，断层宽度W=5.6km. 余震序列的高精度定位结果和能量分布走向，很好地证实了主震的断层破裂走向为N50°W，震区马尾菁断裂为主震发震构造，断层错动性质以右旋走滑为主. 用横波记录资料及波谱分析方法估算出余震的震源参数: 地震矩范围为1010～1016N·m，震源破裂半径a为80～500m，地震应力降范围为0.01～9.5MPa. 较大应力降(Δσ>1.0MPa)沿主断层线性排列，大应力降(Δσ>2.0MPa)与ML≥3.0级地震相关. 余震能量释放和高应力降的地震多发生在6.0～11km的深度范围，说明在这一深度范围内最大程度地集中了地壳中的应力.
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| 关 键 词： | 近场数字地震观测 震源机制解 震源参数 姚安地震 |
| 文章编号： | 0001-5733(2003)05-0633-09 |
| 收稿时间： | 2001-9-10 |
| 修稿时间： | 2003-3-27 |
SOURCE PARAMETERS OF THE YAO'AN EARTHQUAKES IN 2000 |
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| QIN JAZHENG.SOURCE PARAMETERS OF THE YAO''''AN EARTHQUAKES IN 2000[J].Chinese Journal of Geophysics,2003,46(5):633-641. |
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| Authors: | QIN JAZHENG |
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| Institution: | Seismological Bureau of Yunnan Province, Kunming 650041, China |
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| Abstract: | On Jan.15, 2000, an earthquake sequence including the main shock of MS6.4 occurred in the Yao'an region of Yunnan province. We study the physical process of this sequence using the data of aftershock sequence recorded by the nearfield small aperture observational network. Calculated by the seismic scaling law, the parameters of the mainshock are: seismic moment M0=1.58×1018N·m, moment magnitude MW=6.0, average dislocation D—=0.63m, fault length L=16.6km, and fault width W=5.6km. Locating result of the accurate aftershock sequence and strike of aftershocks energy distribution have verified that the fault rupture strike of the Yao'an mainshock of MS6.4 is about N50°W. They have also verified that the Maweijing fault in the seismic region is the seismogenic structure of the mainshock, and the fault property is of right lateral slipping type. The focal parameters of these earthquakes are estimated by utilizing the recorded data of transverse wave and the method of spectrum analysis. The range of seismic moment M0 is between 1010 and 1016N·m, the rupture radius of seismic sources varies from 80m to 500m, and seismic stress drop is in the range of 0.01～9.5MPa. The large stress drops (Δσ>1.0MPa) arrange in linear manner along the main fault, and the larger stress drops (Δσ>2.0MPa) are related with earthquakes of ML≥3.0. Both energy release of aftershocks and the earthquakes with high stress drops occur mostly in the depth range from 6km towhich means that the stress in the Earth's crust is mainly concentrated in this depth range. |
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| Keywords: | Nearfield digital seismic observation Focal mechanism Seismic parameters Yao'an earthquake |
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