Rupture directivity effect on the seismic ground motion parameter during Italy MW6.6 earthquake on October 30，2016
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摘要: 2016年10月30日意大利中部发生了MW6.6地震，这是继8月24日MW6.2地震后的又一次浅源破坏性地震，意大利国家强震台网在此次地震中获得了丰富的强震动三分向加速度记录。本文从工程强震动数据中心下载了三分向加速度记录，经基线校正和滤波等常规数据处理后发现，强震动体现出明显的方向性效应。根据震源机制解将强震动台站分为破裂前方区域的NW组和破裂后方区域的SE组，采用最小二乘法回归了不同分组的地震动峰值加速度、反应谱和持时的衰减规律，得出断层破裂方向性对地震动参数的幅值影响较大，在断层距相同的情况下，破裂前方区域的加速度和加速度反应谱幅值均高于破裂后方区域，而破裂前方区域的地震动持时远小于破裂后方区域，破裂方向性显著。Abstract: On October 30, 2016, another shallow-source MW6.6 earthquake occurred in cen-tral Italy after August 24 MW6.2 earthquake. A large number of three-component acceleration recordings of strong ground motion were collected by Italian strong-motion network and were downloaded from Engineering Strong Motion database （ESM） and analyzed by the base-line correction, filtering and other conventional data processing. Strong motion observation stations were divided into two groups as front rupture area NW and rear rupture area SE according to the focal mechanism solutions. Attenuation relationships of ground motion parameters, including amplitude, response spectrum and durations, were regressed by using the least squares method in the different two groups and we found that acceleration amplitude was affected by rupture directivity remarkably, and the amplitude and response spectrum of acceleration in the NW group were greater than those in the SE group in the case of the same Joyner-Boore distance RJB, while the duration in NW group was more less than that in SE group. In conclusion, near-source ground motion recordings were much rich and the characteristics of strong ground motion were greatly influenced by rupture directivity.
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图 1 2016年10月30日意大利MW6.6地震震中、台站（a）及余震（b）分布图
余震信息来自USGS（2016）发布统计结果
Figure 1. Distribution of earthquake epicenter，stations （a） and aftershocks （b） of Italy MW6.6 earthquake on October 30，2016. Aftershocks are from USGS （2016）
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图 2 近震源附近不同场地条件下台站（震中距R＜100 km）的分布和8个台站的三分向加速度时程图
Figure 2. Distribution of near-source stations with R＜100 km and the acceleration time history at eight stations
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图 3 强震动记录数量与震中距Repi及RJB直方图
Figure 3. Histogram of the strong motion recordings number and the epicentral distance Repi as well as RJB
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图 5 水平向（a）和垂直向（b）地震动峰值加速度PGA的空间分布
Figure 5. Distribution of horizontal （a） and vertical （b） peak ground motion accelerations
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图 6 NW组和SE组峰值加速度PGA随RJB的变化关系
图（a）−（d）分别为场地A，B，C和D，E；图（e），（f）分别为NW组和SE组的PGA-H和PGA-UD
Figure 6. The relations of peak ground motion acceleration with RJB
Figs. （a）−（d） are sites A，B，C and D，E；Figs. （e） and （f） are PGA-H and PGA-UD of NW and SE groups respectively
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图 7 不同分组时的地震动持时随RJB的变化规律
Figure 7. Relations of ground motion durations in different groups versus RJB
（a） DB （0.025g）；（b） DB （0.05g）；（c） DB （0.1g）；（d） DU （0.025g）；（e） DU （0.05g）；（f） DU （0.1g）；（g） DE （0.025g）；（h） DS （5%—75%）；（i） DS （5%—95%）
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图 8 不同的地震动持时在不同的场地条件下随RJB变化的分布图
Figure 8. Distribution of different ground motion durations at different site conditions with RJB
（a） DB （0.025g）；（b） DB （0.05g）；（c） DB （0.1g）；（d） DU （0.025g）；（e） DU （0.05g）；（f） DU （0.1g）；（g） DE （0.025g）；（h） DS （5%—75%）；（i） DS （5%—95%）
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图 9 NW组和SE组台站记录的水平向峰值加速度反应谱PSA-H
图（a）—（d）分别为T=0.2，0.5，1.0和2.0 s时水平向峰值加速度反应谱PSA-H随RJB的变化曲线；图（e）为NW组和SE组水平向峰值加速度反应谱PSA-H的比较
Figure 9. Peak acceleration response spectrum of group NW and SE
Figs. （a）−（d） are relationships of PSA-H of NW and SE groups at 0.2，0.5，1.0 and 2.0 s versus RJB respectively，Fig. （e） is comparison of PSA-H of NW group with SE group
表 1 部分台站和强震动记录信息
Table 1 Information of partial stations and ground motion recordings
台站名称 场地类型 北纬/° 东经/° 震中距
/kmRJB/km PGA/（cm·s−2） PGA-H
/（cm·s−2）东西向 南北向 垂直向 IV.T1213 A 42.72 13.13 12.0 7.8 779.3 850.0 868.9 574.3 IV.T1214 B 42.76 13.21 11.4 7.2 593.2 413.0 632.9 416.1 IT.AMT B 42.63 13.29 26.5 21.4 521.6 393.6 317.8 382.6 IT.ACC A 42.70 13.24 18.6 14.0 425.9 384.7 546.9 340.0 IT.CLO A 42.83 13.21 7.8 3.9 418.6 571.4 782.0 326.2 IT.NRC B 42.79 13.10 4.6 0.9 476.4 365.1 367.5 307.7 IT.CNE C 42.89 13.15 7.7 3.8 466.7 288.3 536.5 286.1 IT.FOC C 43.03 12.90 27.8 22.6 372.2 335.6 219.2 264.9 
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表 2 峰值加速度PGA随RJB变化关系拟合系数表
Table 2 Parameters of regression equations for PGA changes versus RJB
分组 方向 C1 C2 C3 ε NW组 水平向 6.352 −2.598 20.5 0.453 垂直向 6.344 −2.607 20.5 0.501 SE组 水平向 5.892 −2.512 20.5 0.500 垂直向 5.889 −2.509 20.5 0.421
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表 3 水平向地震动持时随RJB变化关系的拟合参数表
Table 3 Parameters of regression equations for durations in horizontal components versus RJB
破裂前方区域 （NW） 破裂后方向区域 （SE） 持时/s 拟合公式 平行于断层走向 垂直于断层走向 平行于断层走向 垂直于断层走向 a b ε a b ε a b ε a b ε DB （0.025g） D=aebR＋ε 20.16 0.01 6.95 20.84 0.02 6.49 23.61 0.01 8.21 21.76 0.01 6.43 DB （0.05g） 16.81 0.03 2.95 18.14 0.04 2.42 15.41 0.02 3.87 16.28 0.02 3.86 DB （0.1g） 12.97 0.05 2.54 13.00 0.04 1.93 10.26 0.02 3.92 12.93 0.03 4.54 DU （0.025g） 11.74 0.04 1.52 12.37 0.04 1.39 9.80 0.03 2.36 10.53 0.04 2.60 DU （0.05g） 11.46 0.04 1.44 12.09 0.04 1.48 9.51 0.03 2.39 9.82 0.03 2.72 DU （0.1g） 11.20 0.04 1.63 11.33 0.03 1.56 8.65 0.01 2.32 9.53 0.02 3.06 DE 10.91 0.03 1.68 10.98 0.03 1.68 10.29 0.02 3.19 11.25 0.02 3.12 DS （5%—75%） D=a＋bR＋ε 1.27 0.16 3.08 2.34 0.13 2.84 3.50 0.17 4.15 3.83 0.17 4.31 DS （5%—95%） 2.68 0.33 6.26 4.17 0.29 5.01 6.14 0.37 9.77 7.07 0.35 9.61
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表 4 峰值加速度反应谱PSA随RJB变化关系的拟合系数表
Table 4 Parameters of regression equations for PSA changes versus RJB
T/s NW组 SE组 C1 C2 C3 ε C1 C2 C3 ε 0.2 6.35 −2.58 21.2 0.45 0.2 5.68 −2.21 21.6 0.5 6.38 −2.51 20.5 0.47 0.5 5.96 −2.49 20.5 1.0 6.08 −2.51 21.5 0.50 1.0 5.89 −2.51 20.5 2.0 5.89 −2.47 20.5 0.50 2.0 5.77 −2.52 20.5
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