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为了在缺少实时台站数据的情况下,研究震后地表地震动分布,本文尝试通过对震源做出某些约束,以提高震动图的精度。由于青海玉树地震的发震断层近似直立(倾向83°),震源破裂过程在时间和空间上呈明显的分区特征,分别考虑了地表破裂的线源发生模型和主震震级分解方法,用考虑了场地效应的震动图快速生成方法生成震动图。将两种方法生成的震动图与调查烈度比较。结果表明,基于震源破裂过程对主震震级进行分解,综合考虑各子事件生成震动图的方法,对震后的应急决策和灾情的快速评估是可行的。
In order to study the distribution of post-earthquake surface ground motion in the absence of real-time station data, this paper attempts to improve the accuracy of the vibration map by making some constraints on the source. Because the seismogenic fault of Yushu earthquake in Qinghai Province is approximately upright (with an inclination of 83 °), the source rupture process shows obvious zoning characteristics in time and space. The source generation model of surface rupture and the method of magnitude decomposition of mainshock are considered respectively. Vibration map of site effect Generates vibration map quickly. Comparing the vibration charts generated by the two methods with the survey intensity. The results show that based on the source rupture process, the magnitude of mainshock can be decomposed. Considering all the sub-events to generate the vibration map, the post-earthquake emergency decision and the rapid assessment of the disaster are feasible.