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的建筑设计框架下，发展一种现代的、准确的地震时地震动特性评估方法。我们应用空间自相关（SPAC）方法，利用地脉动来确定S波速度结构，从而基本了解地震时地面的震动特性。SPAC方法是一种利用环境地面振动的廉价工具，因此我们可以使用常规地震仪器在任何地方进行测量，并且它在城市地区的实施中具有上级优势。该方法的问题是测量的准确性、可靠性和处理。通过对SPAC方法与PS测井结果的对比研究，证实了SPAC方法的准确性和可靠性。我们还检查了速度结构模型的准确性SPAC方法使用的放大地震运动记录的一组地面和井下传感器。将SPAC方法应用于1999年土耳其Kocaeli地震中土耳其的阿达帕扎里和伊斯坦布尔两个地震灾区，以了解有限区域内地震破坏率的巨大差异。我们可以成功地解释这种差异是由于土-地基条件的差异。在地面运动模拟中，利用SPAC方法确定的速度模型，可以成功地模拟观测到的地面运动，不仅包括幅值，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.