Spatial Based Integrated Assessment of Bedrock and Ground Motions, Fault Offsets, and Their Effects for the October-November 2002 Earthquake Sequence on the Denali Fault, Alaska

基于空间的基岩和地面运动综合评估、断层偏移及其对 2002 年 10 月至 11 月阿拉斯加德纳利断层地震序列的影响

• 批准号: 0314155
• 负责人: Robert Carlson
• 金额: $ 9.93万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-15 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0314155&HistoricalAwards=false
• 关键词: Spatial; Based; Integrated; Assessment; Bedrock

The M6.7 Nenana Mountain, Alaska earthquake that occurred on 23 October 2002 was followed by the M7.9 Denali Fault earthquake on 3 November 2002. The latter event is one of the largest strike-slip earthquakes to occur in the United States. Intense ground shaking lasted over 45 seconds. By comparison, the M7.1 1989 Loma Prieta Earthquake lasted 15 seconds. The Denali fault earthquakes caused ground failure and damage to several structures and highway bridges. However, considering the magnitude and associated energy release of the 3 November event, the damage was substantially less than expected.This action is to support a group of engineers and scientists to collect perishable data from the October-November 2002 earthquake sequence on the Denali Fault, Alaska. A nucleus of Alaskan scientists and engineers have agreed to cooperate with this research team and to satellite platform data that is stored for only a limited period of time. It builds on the findings of a geotechnical engineering reconnaissance team that visited the affected areas within days following the earthquake sequence. The objective is to archive bedrock motions, ground motions and fault offsets and their effects. It includes the accumulation of all strong motion records, satellite imagery, satellite remote sensing data, aerial and ground photographs, and structural response (both measured and anecdotal). Several interesting data sets will be archived, including ice cover, lateral movement of stream channels, landslides, avalanches, glacial fracturing, "felt" ground motions, and changes in water quantity and quality. The data sources may be spatially integrated to provide a comprehensive assessment of the bedrock and ground motions and fault offsets.The work of the reconnaissance team is a necessary prerequisite to understanding why the ground motions experienced did not substantially damage structures and the infrastructure. Furthermore, it will facilitate a comparison of Denali events with the 1989 Loma Prieta earthquake and the recent Kocelli and Dozce earthquake events in Turkey - all of which were associated with strike-slip faulting. Finally, the spatially integrated data will provide the basis for further research. For example, it can be used to model the observed landsliding and avalanches, changes in water quantity and quality, glacial fracturing, and the widespread liquefaction and lateral spreading that occurred along the Tok cutoff and Northway airport.An Advisory Board will help identify and provide access to data sources, and make recommendations regarding the format for presentation of the project results to insure their widespread use by other investigators. A webpage will be prepared to provide access to all data sets, analysis results, and digital photographs that are made available to the reconnaissance team, and to facilitate future research.

2002年10月23日发生的阿拉斯加州内纳纳山6.7级地震之后，2002年11月3日发生了德纳里断层7.9级地震。 后一个事件是美国发生的最大的走滑地震之一。 强烈的地面震动持续了45秒。 相比之下，1989年洛马普列塔7.1级地震持续了15秒。 德纳里断层地震造成地面塌陷，并对几座建筑物和公路桥梁造成破坏。 然而，考虑到11月3日地震的震级和相关的能量释放，损失远低于预期，这一行动是为了支持一组工程师和科学家收集2002年11月至2002年11月阿拉斯加德纳里断层地震序列的易腐数据。 阿拉斯加科学家和工程师的核心已同意与该研究小组合作，并同意使用仅在有限时间内存储的卫星平台数据。 它是以一个岩土工程勘察队的调查结果为基础的，该勘察队在地震发生后几天内访问了受灾地区。 其目的是存档基岩运动，地面运动和断层偏移及其影响。 它包括所有强震记录、卫星图像、卫星遥感数据、空中和地面照片以及结构响应（测量和传闻）的积累。 几个有趣的数据集将被存档，包括冰盖，河道的横向运动，山体滑坡，雪崩，冰川断裂，“感觉”地面运动，以及水量和水质的变化。 数据源可以在空间上进行整合，以提供对基岩和地面运动以及断层偏移的全面评估。勘察小组的工作是理解为什么所经历的地面运动没有对结构和基础设施造成实质性破坏的必要先决条件。 此外，它将有助于比较德纳里事件与1989年洛马普列塔地震和最近在土耳其发生的科切利和多兹切地震事件-所有这些都与走滑断层。 最后，空间整合的数据将为进一步的研究提供基础。 例如，它可以用来模拟观测到的滑坡和雪崩，水量和水质的变化，冰川断裂，以及沿着托克截止线和诺斯韦机场发生的广泛液化和横向扩散。一个咨询委员会将帮助确定和提供对数据源的访问，并就项目结果的表述格式提出建议，以确保其他研究人员广泛使用。 将准备一个网页，以提供所有数据集，分析结果，并提供给侦察队的数码照片，并促进未来的研究。