2011年缅甸M7.2地震强震动观测记录初步分析
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摘要
简要介绍了2011年3月24日缅甸勐帕亚M7.2地震发生后,云南强震动台网中心55个台站接收到的强震动记录及其初步处理结果,并对地震动衰减关系拟合、频谱随震中距的震域变化及地震动持时特征进行了分析。结果表明:由云南地区强震动记录资料拟合的地震动衰减关系相对于大陆区域的地震动衰减关系,与此次强震动记录具有更好的相关性。地震动加速度卓越频率依Ⅰ、Ⅱ、Ⅲ类场地及楼房结构而依次变低,且随着震中距加大,强震动记录主频值呈变小趋势。场地类别对地震动水平分量持时的影响比竖向分量更明显一些。最后对仪器触发范围、方式、响应半径问题进行了探讨。
We introduce the seismic parameters of strong motion recordings of Mongpayak M7.2 earthquake on Mar.24 in Myanmar recorded by 55 stations in Yunnan Strong Motion Network(YSMN) and their data processing results.Then we analyze the fitting attenuation curve,frequency attenuation with the epicenter distance and duration of ground motions.The results show that the attenuation relation of ground motion fitted by strong motion recordings in Yunnan is more correlative with the Myanmar M7.2 earthquake than that in China.The predominant frequency of ground motion acceleration decreases with the different site class I,II,III,different building structures,and the increasing of epicenter distance in turn.The effect of site class on the duration of ground motion in horizontal component is more obvious than that in vertical component.Finally we discuss the trigger range,trigger mode and responding range of monitor in YSMN.
We introduce the seismic parameters of strong motion recordings of Mongpayak M7.2 earthquake on Mar.24 in Myanmar recorded by 55 stations in Yunnan Strong Motion Network(YSMN) and their data processing results.Then we analyze the fitting attenuation curve,frequency attenuation with the epicenter distance and duration of ground motions.The results show that the attenuation relation of ground motion fitted by strong motion recordings in Yunnan is more correlative with the Myanmar M7.2 earthquake than that in China.The predominant frequency of ground motion acceleration decreases with the different site class I,II,III,different building structures,and the increasing of epicenter distance in turn.The effect of site class on the duration of ground motion in horizontal component is more obvious than that in vertical component.Finally we discuss the trigger range,trigger mode and responding range of monitor in YSMN.
引文
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Li XiaoJun,Zhou ZhengHua,Huang M,et al.2008.Preliminary Analysisof Strong-Motion Recordings from the Magnitude8.0Wenchuan,China,Earthquake of12May2008[J].Seismological Research Let-ters,79(6):844-854.
崔建文,李世成,高东,等.2006.云南分区地震动衰减关系[J].地震研究,29(4):386-391.
胡聿贤.1988.地震工程学[M].北京:地震出版社.
胡聿贤.2006.地震工程学[M].北京:地震出版社.
李世成,崔建文,韩新民.2003.云南地区地震烈度衰减特征研究[J].中国地震,19(3):287-294.
刘小弟,王亚勇,高东,等.1991.近场地面运动特征研究[A]//云南澜沧—耿马震害论文集[C].北京:科学出版社.
汪素云,俞言祥,高阿甲,等.2000.中国分区地震动衰减关系的确定[J].中国地震,16(2):99-103.
王培德,王鸣,周家玉,等.1991.澜沧—耿马地震强余震近场地面运动特征[A]//云南澜沧—耿马震害论文集.北京:科学出版社.
向建光,高东.1992.云南地区基岩水平峰值加速度衰减规律[J].中国地震,3(8):14-20.
谢礼立,于双久.1982.强震观测与分析原理[M].北京:地震出版社.
周雍年.2011.强震动观测技术[M].北京:地震出版社.
Boore D M,Bommer J J.2005.Processing of strong-motion accelerograms:needs,options and consequences[J].Soil Dynamics and EarthquakeEngineering,25(2):93-115.
Boore D M,Stephens C D,Joyner W B.2002.Comments on baseline cor-rection of digitalstrongmotion data:Examples from the1999HectorMine,California,earthquake[J].BSSA,92(4):1543-1560.
DB/T10-2001,数字强震动加速仪[S].
GB50011-2010,建筑抗震设计规范[S].
Li XiaoJun,Zhou ZhengHua,Huang M,et al.2008.Preliminary Analysisof Strong-Motion Recordings from the Magnitude8.0Wenchuan,China,Earthquake of12May2008[J].Seismological Research Let-ters,79(6):844-854.
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