| 2014年新疆于田MS7.3地震强地面运动模拟及震动图预测 |
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| 引用本文： | 刘军,孙甲宁,宋立军,毕雪梅,谭明,何金刚.2014年新疆于田MS7.3地震强地面运动模拟及震动图预测[J].地震学报,2016,38(6):914-923. |
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| 作者姓名： | 刘军 孙甲宁 宋立军 毕雪梅 谭明 何金刚 |
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| 作者单位： | 1.中国乌鲁木齐 830011 新疆维吾尔自治区地震局 |
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| 基金项目： | 中国地震局“三结合”项目(163101)与地震科技星火攻关项目(XH15051)联合资助地震科技星火攻关项目XH15051中国地震局“三结合”项目163101 |
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| 摘 要： | 基于地震动的时空衰减规律和传播特征，采用邻近地震监测台站地震动时程对1 km×1 km尺度的网格点进行近实时插值计算，同时结合场地效应对震区地震动参数进行修正，并以2014年2月12日新疆于田MS7.3地震为例，计算震区格网内各点的地震时程，同时以8 s为时间间隔绘制出地震动峰值等值线图并将其连续播放，得到了于田MS7.3地震峰值地震动(PGV，PGA)的空间分布.结果表明，于田县东部至民丰县北部地区受场地条件影响，震区震害在软弱地基土层及浅地下水位等因素作用下对震区地震动具有明显的放大效应，预测的地震动特征与现场宏观调查结果是一致的.在当前强震台网分布不均匀的情形下，本文方法能较好地描述震区地震动特征，较客观地反映灾区的强地面运动特征.
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| 关 键 词： | 于田MS7.3地震 地震动 监测台站 震动图 |
| 收稿时间： | 2015-09-28 |
Research on strong ground motion simulation and ShakeMap of 2014 Yutian MS7.3 earthquake |
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| Affiliation: | 1.Earthquake Administration of Xinjiang Uygur Autonomous Region, Vrümqi 830011, China2.Earthquake Administration of Jiangsu Province, Nanjing 210014, China |
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| Abstract: | Based on attenuation law and space-time propagation characteristics of seismic ground motion, we use recorded time histories from adjacent monitoring stations to make near real-time interpolation calculation in a 1 km×1 km grid, and correct ground motion parameters according to the site effects. Taking the 12th February, 2014 Yutian MS7. 3 earthquake as an example, we calculated seismic time history in each grid near the epicenter, and then plot peak ground motion contour maps with 8 s intervals continuously. Finally we showed spatial distribution of peak ground motions (PGV and PGA) of this earthquake. The results show that, influenced by site conditions as well as soft ground soil and shallow groundwater level, ground motions in the region from eastern Yutian County to northern Minfeng County were amplified obviously, which were well consistent with field survey results. On the conditions of uneven distribution of strong ground motion observation stations, the method can be used to describe the characteristics of earthquake ground motions, and reflect the characteristics of strong ground motion in disaster areas objectively. |
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