| 2020年7月12日唐山古冶MS5.1地震的强震动特征 |
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| 作者姓名： | 温瑞智 王宏伟 |
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| 作者单位： | 1.中国地震局工程力学研究所，哈尔滨1500802.中国地震局地震工程与工程振动重点实验室，哈尔滨150080 |
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| 基金项目： | 地震科技星火计划项目（XH19071）、国家重点研发计划项目（2017YFC1500800）联合资助。 |
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| 摘 要： | 首都圈强震动观测台相对密集，区域强震动观测能力较强。2020年7月12日6时38分在河北省唐山市古冶区发生MS5.1地震，强震动台和烈度台共收集到三分量强震动记录363组。通过强震动记录数据处理绘制了PGA和PGV的空间分布图，初步认识到此次地震强烈的地震动主要集中于震中附近区域，远离震中的天津塘沽—宁河—宝坻三角区域也观测到“异常增大趋势”的地震动，这与1976年唐山地震的宏观烈度异常区较为一致。同时分析了强震动记录PGA、PGV随距离的衰减规律，通过与为第五代区划图编制建立的东部强震区衰减关系的计算值对比，可以看出与此次地震中PGA、PGV的衰减具有一致的趋势。
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| 关 键 词： | 唐山古冶地震 强震动记录 空间分布 衰减规律 |
| 收稿时间： | 2020-07-23 |
Strong-motion recordings in MS5.1 Guye，Tangshan earthquake on July 12，2020 |
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| Affiliation: | 1.Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China2.Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration，Harbin 150080，China |
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| Abstract: | The high density of strong motion statoins around Capital region makes the high ability of strong motion observation than other regions in China. An MS5.1 earthquake shook the Guye, Tangshan in Hebei Province at 6:38 on July 12, 2020. Strong-motion stations and simple intensity stations totally obtained 363 three-component strong-motion recordings in this earthquake. After processing these recordings, we drew the contours for peak ground acceleration （PGA） and velocity （PGV）, respectively. This earthquake caused the intense ground shaking in a local area around the epicenter. However, the stronger shaking occurred in the area located in Ninghe, Tanggu, and Baodi of Tianjin far from the epicenter, which was found to be the macroseismic intensity anomaly area in the 1976 Tangshan earthquake. We further analyzed the attenuation characteristics of PGA and PGV. The attenuation relationship for the fifth zonation map of East China can describe the attenuation with distance for PGAs and PGVs in this earthquake. |
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