2016年8月24日在意大利佩鲁贾地区发生MW 6.2地震，截至北京时间2016年8月25日8时，共获得强震记录192组，分析地震动PGA、反应谱以及能量参数的衰减特征。研究结果表明：①峰值。此次地震PGA>100 cm/s2记录的水平平均反应谱在短周期明显大于欧洲的设计谱。两水平方向平均反应谱谱比小于1.5，并且在短周期（T < 0.5 s）谱比差值变化较大，说明此次地震EW向地震动对短周期结构物影响较大；②衰减特性。整体看来，此次地震中的PGA值均不同程度低于中国第五代区划图中的中强地震区、中国西部地区、美国西部地区以及欧洲中小地震衰减模型的预测值，且衰减快。Arias强度的衰减变化趋势与Travasarou等的理论模型基本一致，但均小于理论模型值；③持时。此次地震的相对持时随震中距增大有逐渐增大趋势，持时均大于Kempton及McQuire的理论模型，表明此次地震的能量释放时间较长。此次意大利地震的地震动参数特征研究表明，该地震具有能量衰减快、持续时间长、对短周期结构物影响较大等特点，验证了此次地震破坏集中在近场、远场震害相对较轻的结论，这也是造成本次地震灾害严重的主要原因。
An MW 6.2 earthquake occurred in Perugia, in Italy on August 24, 2016. Up to the 8 a.m of Beijing on August 25, 2016, the Italy earthquake department received a total of 192 sets of strong motion records. Based on these processed record, we study the characteristics of response spectrum, PGA and the energy attenuation of the earthquake. The results show that: In terms of peak ground acceleration, the horizontal average response spectrum of the recorded PGA greater than 100 cm/s2 in the earthquake is significantly greater than the European design spectrum in the short period, and the average response spectrum ratio is less than 1.5, and in the short period (T<0.5 s), the difference of the ratio is larger, so it shows that the east-west direction of the ground motion has a great influence on the short period structure; In terms of the attenuation characteristics, overall, PGA values of the earthquake are lower than the predicted values of the moderate earthquake area of the fifth generation of China, the western region of China, the western region of the United States and Europe, and fast decay; the attenuation trend of the model of Arias intensity of the earthquake and the theoretical model proposed by Travasarou are basically the same, but the values of Arias intensity of the earthquake are less than the theoretical model; In terms of the duration, the duration of the earthquake with distance increase is gradually increasing, and it is higher than the theoretical model of Kempton and McQuire, indicating that the energy release time of the earthquake is longer. Through the study of the characteristics of the ground motion parameters, we know that the earthquake has the characteristics of fast energy attenuation, long duration and great influence on short period structures, and the results show that the seismic damage is concentrated in the near field, but the far field earthquake damage is relatively light, and this conclusion is also the main cause of serious disasters in the earthquake.
2017,38(6): 57-63 收稿日期：2016-12-08
DOI：10.3969/j.issn.1003-3246.2017.06.011
基金项目：中国地震局工程力学研究所基本科研业务专项（项目编号：2014B06，2016A01）；国家自然科学基金（项目编号：51578516，51238012）
作者简介：孙健(1993—),男,硕士,主要从事地震动衰减关系研究工作.E-mail:984484213@qq.cn
*通讯作者：胡进军(1978—),男,博士,研究员,主要从事地震动参数特征分析研究工作.E-mail:hujinjun@iem.ac.cn
参考文献：
胡进军,谢礼立. 汶川地震近场加速度基本参数的方向性特征[J]. 地球物理学报,2011,54(10):2 581-2 589.
环球网. 意大利地震致近300人死约千人送医 俄救援队将抵达[EB/OL]. (2016-08-30)[2016-11-29]. http://world.huanqiu.com/hot/.2016-08/9378885.html.
靳超宇,俞言祥. 欧洲中小震基岩水平向地震动衰减关系研究[J]. 中国地震,2009,25(2):170-177.
马强. 强震动观测简报2016年第12期(20160824意大利中部6.2级地震)[Z]. 中国地震局工程力学研究所,2016网易财经. 意大利地震已致247人死亡,为什么那里地震频发? [EB/OL]. (2016-08-25) [2016-11-29]. http://money.163.com/16/0825/16/BVAVV0B3002580S6.html.
新华社. 意大利中部强震至少38人丧生 多座村庄被夷为平地[EB/OL]. (2016-08-25)[2016-11-29]. http://news.xinhuanet.com/world/2016-08/25/c_129252830.htm.
俞言祥,李山有,肖亮. 为新区划图编制所建立的地震动衰减关系[J]. 震灾防御技术,2013,8(1):24-33.
俞言祥,王素云. 中国东部和西部地区水平向基岩加速度反应谱衰减关系[J]. 震灾防御技术,2006,1(3):206-207.
张翔. 中国建筑抗震设计规范与欧洲规范Eurocode 8关于抗震设计反应谱的比较[J]. 四川建筑科学研究,2012,38(2):183-186.
Arias A. A measure of earthquake intensity[A]. In: Hansen R J (ed.). Seismic Design for Nuclear Power Plants[M]. Cambridge Massachusetts: MIT Press, 1970: 4838-483.
Boore D M. Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi, Taiwan[J]. Bulletin of the Seismological Society of America, 2001, 91(5): 1 199-1 211.
Comité Européen de Normalisation. Eurocode 8: Design of Structures for Earthquake Resistance. Part1: General Rules, Seismic Actions and Rules for Buildings[S]. Brussels, Belgium: Comité Européen de Normalisation, 2004.
Kempton J J, Stewart J P. Prediction equations for significant duration of earthquake ground motion considering site and Near-source Effects [J]. Earthquake Spectra, 2006, 22(4): 985-1 013.
McGuire R K, Barnhard T P. The usefulness of ground duration in predicting the severity of seismic shaking[A]. In: Proc. 2nd US Nat, Conf [C]. Earthquake Engineering, 1979: 713-722.
Trifunac M D, Brady A G. A study on the duration of strong earthquake ground motion[J]. Bulletin of Seismological Society of America, 1975, 65(3): 815-626.
Travasarou T, Bray J D, Abrahamson N A. Empirical attenuation relationship for Arias intensity[J]. Earthquake Engineering and Structural Dynamics, 2003, 32(7): 1 133-1 155.
