Rapid Generation of Ground Motion Maps of the 8/17/99 Turkey and 9/20/99 Taiwan Earthquakes

1999年8月17日土耳其7.4级地震和1999年9月20日台湾7.6级地震都是在近断层区广泛记录到的。 它们共同提供了一个前所未有的机会，以了解大地震的性质及其对自然和建筑环境的影响。 尽管加州沿海地区的大多数建筑物都设计成能承受附近大于7级地震的地面运动，但实际上没有此类地震的记录可用于工程分析和设计。 这两次地震的数据有可能大大提高可靠地描述控制地震活跃区结构设计的地面运动的能力。由于大地震后数字强震数据的可用速度，强震数据可供实地勘察小组访问土耳其和台湾时使用，为工程师解释观察到的损坏提供了有价值的指导。 强震数据的快速可用性还提供了通过地面运动图来描述记录地点和受这些地震影响的整个地区的强震特征的能力。该奖项的目的是支持这些地图的开发，主要基于记录的强震数据。 这些地面运动图将使用关于场地条件的广泛地质类别（如冲积层、软岩和硬岩）的现有信息来说明场地条件。 参数包括峰值加速度、峰值速度和5%阻尼响应谱加速度，周期为0.3、1.0、2.0和4.0秒。 这些初步地图是使用两种方法在记录的地面运动之间进行插值而得到的。这些地面运动地图为工程师提供了对特定地点经历的地面运动的估计，以便解释在勘察调查中观察到的损坏和故障的原因。 这些地面运动图将放在万维网上，以便地震工程研究界迅速和广泛地获得这些数据。

Abstract9988879The magnitude 7.4 Turkey earthquake of August 17, 1999 and the magnitude 7.6 Taiwan earthquake of September 20, 1999 were both widely recorded in the near fault region. Together, they provide an unprecedented opportunity to understand the nature of large earthquakes and their effects on the natural and built environment. Although most structures in the coastal regions of California are designed to withstand the ground motions form nearby earthquakes of magnitude larger than 7, there are practically no recordings of such earthquakes available for use in engineering analysis and design. The data from these two events have the potential to greatly enhance the ability to characterize reliably the ground motions that control the design of structures in seismically active regions.Due to the speed with which digital strong motion data are now available following a major earthquake, strong motion data were available to field reconnaissance teams when they visited Turkey and Taiwan, providing valuable guidance to engineers in their interpretation of the observed damage. The rapid availability of strong motion data also provides the ability, by means of ground motion maps, to characterize the strong ground motions at recording sites and throughout the regions affected by these earthquakes.The objective of this award is to support the development of these maps, based primarily on the recorded strong motion data. These ground motion maps will account for site conditions using available information on broad geological categories of site conditions, such as alluvium, soft rock, and hard rock. The parameters include peak acceleration, peak velocity, and 5% damped response spectral acceleration at periods of 0.3, 1.0, 2.0 and 4.0 seconds. These preliminary maps are refined using two methods of interpolating between recorded ground motions.These ground motion maps provide engineers with estimates of the ground motions experienced at specific sites, in order to interpret the causes of damage and failure observed in the reconnaissance investigations. These ground motion maps will be placed on the World Wide Web to provide rapid and broad access to this data by the earthquake engineering research community.