PEER地震动数据库中含速度脉冲近场地震记录

Near-field Earthquake Records with Velocity Pulse in PEER Ground Motion Database

以断层距0-20km为范围,利用美国太平洋地震研究中心PEER数据库收集整理含速度脉冲近场地震记录。研究了速度脉冲峰值和PGV/PGA比值分别与场地类别、矩震级以及断层距的关系。依据现有的PEER数据库,共整理出126条含速度脉冲近场地震记录,并按水平速度脉冲峰值由大到小顺序给出了该126条地震记录的列表。水平速度峰值主要分布于30-150cm/s,集集地震记录最多,C类和D类场地的地震记录数量较多。峰值大于100cm/s的速度脉冲地震记录主要出现在C类和D类场地,它们均出现在矩震级6.5级以上的地震记录中,均分布于断层距0-10km的范围内。PGV/PGA比值大于0.2的地震记录主要分布于C类和D类场地,除编号RSN316的地震记录外均出现于矩震级6.5级以上的地震记录中,主要分布于断层距0-10km的范围内。

Earthquake records with velocity pulse in the near field,which is within a distance less than 20 km to the fault,are collected from the database PEER of the US Pacific Earthquake Research Center.The relationships of peak velocity pulses values and PGV/PGA values with site classification,moment magnitude and fault distance are studied respectively.Total 126 earthquake records with velocity pulses in the near field are extracted from the present PEER database.The list of the 126 earthquake records is given in descending order according to the peak velocity values of the horizontal pulses.The horizontal peak velocity values of the 126 near-field earthquake records are mainly distributed in the range of 30-150 cm/s.Most of the records are from Chi-Chi earthquake,following by the records from sites C and D.The earthquake records with peak velocity pulses larger than 100 cm/s are mainly in sites C and D.These records are mainly collected in earthquakes with moment magnitude above 6.5 and develop in the field less than 10 km to faults.The earthquake records with PGV/PGA values bigger than 0.2 are mainly in the sites C and D.These records are obtained in the earthquakes with moment magnitude above6.5 and within the band less than 10 km to faults,excepting the earthquake record of RSN316.