2016年8月24日意大利M_W6.2地震近场地震动方向性效应

发布时间：2018-03-06 22:20

本文选题：意大利MW.地震　切入点：破裂方向　出处：《地震学报》2017年01期 　论文类型：期刊论文

【摘要】：为研究2016年8月24日意大利中部MW6.2地震的断层破裂方向性效应,依据断层走向将强震动观测台站划分为SE和NW两组,比较两组记录的地面峰值加速度PGA、地面峰值速度PGV、拟加速度反应谱PSA和重要持时D_(SR).结果显示:NW组观测到的PGA,PGV和PSA普遍大于SE组,PGA和PGV的观测值与预测值的残差随方位角变化明显;NW组观测到的DSR值整体小于SE组,由此推断此次地震存在明显的方向性效应.在此基础上,采用反演方法,确定了该地震的震源为双向非对称破裂,主破裂方向大约介于345°—360°之间,主破裂长度约占整个破裂的70%—80%,破裂速度为2.2—2.5km/s,反演结果印证了两组台站数据的地震动参数差异是由断层破裂方向效应所引起的.
[Abstract]:Rupture directivity effect for research in August 24, 2016 in central Italy MW6.2 earthquake faults, according to fault trend of the strong motion observation station is divided into SE and NW two groups, compared two groups of records of the peak ground acceleration PGA, the peak velocity of PGV, PSA and pseudo acceleration response spectrum to D_ (SR). The results showed that: NW the observed group of PGA, PGV and PSA are generally higher than that of group SE, PGA and PGV of the observation residuals and predicted values of the azimuth angle change was observed in NW group; the value of DSR is less than SE group, concluded that the earthquake has direction effect. On this basis, using the inversion method to determine the the earthquake rupture is a two-way asymmetry between the main rupture direction is approximately between 345 ~ 360 degrees, 80% - 70% main rupture length about the rupture, rupture velocity is 2.2 2.5km/s, the inversion result confirms the two group data of seismic stations. The number difference is caused by the effect of the fault rupture direction.

【作者单位】：中国地震局工程力学研究所;中国地震局地震工程与工程振动重点实验室;
【基金】：黑龙江省科学基金(LC2015022) 地震行业科研专项(201508005) 中国地震局创新团队发展计划国家自然科学基金(51308515)共同资助
【分类号】：P315

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