Research on practical use of array analysis of microtremors for subsoil survey in the framework of performance-based design of building

研究的目的是在基于性能化的建筑设计框架下，发展一种新的、准确的评估地震作用下地面震动特性的方法。应用微震空间自相关方法确定S波的波速结构，初步了解地震过程中地面的震动特征。SPAC方法是一种成本较低的工具，可以利用环境地面振动，因此我们可以在任何地方使用常规地震仪器进行测量，在城市地区进行测量时它是优越的。该方法存在的问题是测量的准确性、可靠性和可操作性。通过这项研究，我们通过将SPAC方法的结果与被认为是最可靠的数据的PS测井结果进行对比研究，证实了SPAC方法的准确性和可靠性。我们还利用一组地面和井下传感器记录的地震运动放大，检验了SPAC方法速度结构模型的准确性。将SPAC方法应用于1999年土耳其科凯利地震的受灾地区阿扎扎里和伊斯坦布尔，以了解有限区域内损伤率的显著差异。我们可以成功地解释由于土壤-地面条件的不同而产生的差异。在地面运动模拟中，利用SPAC方法确定的速度模型，可以成功地模拟出观测到的地面运动，不仅包括振幅，还包括相位。

The objectives of the research is to develop a contemporary and accurate method for evaluating the ground shaking characteristics during earthquake under a framework of the performance based building design. We applied the Spatial Auto Correlation (SPAC) method using microtremors for determining S-wave velocity structure and then for basic understanding the shaking characteristics of ground during an earthquake. The SPAC method is a less expensive tool so as to use ambient ground vibration therefore we can measure at anywhere using conventional seismic instruments and it is superior in conducting at Urban area. The problems of the method are the accuracy, reliability and handling of measurements. Through this research, we confirmed the accuracy and reliability of SPAC method by comparative studies of results by the SPAC method against those of PS-logging, which have been considered as the most reliable data. We also examined the accuracy of the velocity structure model by the SPAC method using the amplification of earthquake motion recorded by a set of surface and downhole sensors. Both comparisons proved that the results of SMAC method satisfy the requirement and sufficient conditions for practical engineering use, or performance based design.We applied the SPAC method to the damaged area, Adapazari and Istanbul in Turkey from the 1999 Kocaeli, Turkey earthquake to understand the strong difference of damage ratio in a limited area. We could successfully interpret the difference due to the difference of soil-ground conditions. In surface ground motion modeling, we could successfully simulate the observed ground motion, not only amplitudes but also phases, using the velocity models determined by the SPAC method.