Study on the disaster due to the Central Java, Indonesia earthquake of May 27, 2007

2006年5月27日，印度尼西亚爪哇中部发生6.3级地震，造成5700多人伤亡，14万座房屋倒塌。这次地震破坏的特点是，与其小地震规模相比，发生了非常严重的人为和结构破坏。因此，我们的研究重点是从震源位置、震源特征、土体放大和结构的基本反应特性等角度来研究这种对人和建筑物造成破坏性破坏的原因。研究队伍分为地震与地震动组、土体结构组、破坏轮廓与人员损失组、建筑物破坏组和土木工程结构破坏组五个小组，分别在全国进行实地调查和实验室分析。首先，由地震和地动组进行余震观测和…地区确定了更多的余震。利用地震观测资料反演了详细的震源机制。因此，震源区可能位于损伤集中区的正下方，或其西侧。地面构造方面，我们用地磁和大地电流法研究了沉积盆地构造，用地震动测量圈定了浅层次表层构造。结果表明，损伤的空间差异主要取决于浅层次表层结构；对于建筑物的损伤，通过卫星图像分析，勾画出大范围的损伤分布。根据当地法律的实际执行情况和施工实际情况，进行了震害分析，并对钢筋混凝土砖混结构房屋的抗震性能进行了详细的研究。我们还调查了土木工程结构、地面破坏和生命线损伤较少。

Due to the earthquake of magnitude (M) 6.3 of the Central Java, Indonesia earthquake, more than 5,700 casualties and 140,000 collapsed houses were produced on May 27, 2006. The feature of this earthquake damage is that very serious human and structural damage has occurred compared to its small earthquake size. Therefore, our focus of this research is to investigate the cause of such a devastating damage to people and structures from the view point of the source location, source characteristics, soil amplification, and fundamental response characteristics of structures. The research troop is divided into five small teams, namely, the earthquake and ground motion team, the soil structure team, the damage outline and human loss team, the building damage team, and the civil engineering structure damage team, and they perform field surveys in the country and laboratory analysis afterward.First, by the earthquake and ground motion team, aftershock observation was carried out and the area of … More aftershock was determined. The detailed focus mechanism was inverted using earthquake observation data. As a result, the source region was probably located directly under the damage concentration area, or its west side. This means that the causative fault is not connected to the Opak fault.As for the ground structure, we investigate the sedimentary basin structure by using geomagnetism and a telluric current method and we delineate the shallow subsurface layer structure by microtremor measurement. As a result, it turned out that the spatial difference of damage mainly depends on the shallow subsurface layer structure.As for the building damage, wide scale damage distribution was delineated by the satellite imagery analysis. Moreover, the earthquake damage analysis is made based on the actual enforcement of local laws and actual condition of construction, and the earthquake resistance of the building made of reinforced concrete and bricks was investigated in detail. We also investigated civil engineering structure, ground failure, and lifeline damage Less