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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.
In order to study the directional fracture effect of the MW6.2 earthquake in central Italy on August 24, 2016, strong seismic stations were divided into SE and NW groups according to the strike of the fault. The peak ground acceleration PGA, PGV and PSA were measured. The results showed that the PGA, PGV and PSA observed in the NW group were generally higher than those in the SE group. The residuals of the PGA and PGV were significantly different with the azimuth And the obvious change is obvious.The DSR value observed in NW group is less than that of SE group as a whole, and it is inferred that there is obvious directional effect in this earthquake.On this basis, by using inversion method, it is confirmed that the source of the earthquake is bidirectional asymmetric rupture, The main rupture direction is between 345 ° -360 °. The main rupture length accounts for about 70-80% of the entire rupture and the rupture velocity is 2.2-2.5 km / s. The inversion results confirm the earthquakes of two sets of station data The difference of dynamic parameters is caused by the direction of fault rupture.