Long-period source characteristics of the great 1964 Alaska earthquake

1964年阿拉斯加大地震的长周期震源特征

• 批准号: 0609585
• 负责人: Meredith Nettles
• 金额: $ 1.24万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0609585&HistoricalAwards=false
• 关键词: Long; period; source; characteristics; great

The 1964 Alaska earthquake is the second-largest earthquake ever recorded instrumentally. Currentestimates of the long-period source characteristics of this earthquake, including the earthquake sizeand faulting geometry and the timing and distribution of moment release, date from the 1970s. Allof these estimates were made before the development of modern methods of seismogram synthesisand moment-tensor determination. The occurrence of the 26 December, 2004 Sumatra-AndamanIslands earthquake (MW 9.2) has returned attention to the state of our knowledge about the1964 Alaska earthquake, as the Alaska earthquake presents the most natural target for comparison.The proposed research will make use of existing hand-digitized, high-quality surface-waveseismograms from the 1964 mainshock in an inversion for the earthquake moment tensor, centroidlocation and depth, and centroid time; effects of Earth's lateral velocity heterogeneity will be accountedfor in the inversion. Owing to the very large size of the 1964 earthquake, and to the fact that the available data correspond to late-arriving surface-wave orbits, several experiments will be carried out to validate the results obtained. Results obtained from this study will also be of direct use for comparative studiesof other large earthquakes, including the 2004 Sumatra-Andaman Islands earthquake. In addition,the proposed effort to archive the available, hand-digitized data from the 1964 earthquake isanticipated to benefit researchers interested in both earthquake dynamics and Earth structure.The research will support an early-career scientist. At the conclusion of the project, the data used will be permanently archived to make them available for future use by other researchers.

1964年阿拉斯加地震是有史以来第二大地震。这次地震的长周期源特征的电流限量，包括地震s s sizeand断层几何以及矩和分布的时机和分布释放的日期，日期为1970年代。这些估计是在开发现代地震图合成和力矩调整方法之前进行的。 2004年12月26日的发生，苏门答腊 - 安马尼亚群岛地震（MW 9.2）恢复了我们对19964年阿拉斯加地震的了解的关注，因为阿拉斯加地震是比较的最自然的目标。拟议的研究将使用现有的，高质量的地表范围的范围来进行比较。质心和深度以及质心时间；地球横向速度异质性的影响将在反转中考虑。由于1964年地震的尺寸非常大，并且可用的数据对应于晚期的地表轨道，因此将进行几项实验以验证获得的结果。从这项研究中获得的结果也将直接用于其他大地震的比较研究，包括2004年苏门答腊 - 安达曼群岛地震。此外，拟议的努力归档了1964年地震中可用的手工数字数据，以使对地震动力学和地球结构感兴趣的研究人员受益。该研究将支持早期职业科学家。在项目结束时，使用的数据将被永久存档，以使其可供其他研究人员使用。