Characterization of the Great 1964 Alaskan Earthquake at Low-Frequency and Determination of its Source Complexity

这项研究将调查历史上有记录的第二大地震--1964年阿拉斯加地震--的100到300秒的超长周期波。WWSSN台站的长周期记录将在正常模式频段进行检查，以确定该事件的低频震源特征，并确定这是否激发了不寻常的低频地震能量。震源复杂性将通过对长周期面波数据的分析来确定。然后，研究人员将把这些结果与研究人员对历史上有记录以来最大的地震--1960年智利地震进行类似分析所获得的结果进行比较，以便更好地了解这些极大地震的破裂性质，并检查这些事件与其他地震根本不同的可能性。由于这些地震的巨大规模和对地面运动和海啸的破坏性，它们的调查直接应用于国家地震减灾计划。

This research will investigate the very long period waves, 100 to 300 second period, from the second-greatest recorded earthquake in history, the 1964 Alaskan earthquake. The long- period recordings of the WWSSN stations will be examined in the normal mode band to determine the low-frequency source characteristics of the event and establish whether this even texcited an unusual amount of low-frequency seismic energy. The source complexity will be determined from an analysis of the long-period surface wave data. The results will then be compared with those obtained by the researchers' similar analysis of the greatest recorded earthquake in history, the 1960 Chilean earthquake, in order to better understand the nature of rupture of these very great earthquakes and to examine the possibility that these events are fundamentally different from other earthquakes. Because of these events' great size and destructiveness from both ground motion and tsunamis, their investigation has direct application to the National Earthquake Hazard Reduction Program.