Local and Teleseismic Studies of Hawaiian Earthquakes

建议摘要EAR0106537(PH#57x)标题：夏威夷地震的本地和远程地震研究PI：夏威夷大学塞西莉·沃尔夫夏威夷地震丰富，并提供了关于这个海洋热点地区岩浆和构造过程性质的关键信息。有与岩浆侵入和喷发有关的地壳浅层地震，有反映岩浆迁移的中上部岩石圈地幔的地震，有缓解火山增长和火山扩散造成的应力的地震。此外，还有神秘的地壳和地幔地震，这可能是由于各种因素造成的，包括构造薄弱的继承带、火山加载和岩石圈弯曲造成的应力、岩浆运动和热冷却应力。这个项目将进行两项研究：1)对远震记录的地震(4.5兆瓦)进行波形建模，以限制整个夏威夷，包括美国地质观测站夏威夷火山观测站地震台网几何形状不足以提供初始运动机制的许多地区的地震机制和时刻；2)利用高精度技术重新定位当地记录的地震活动对特定目标的影响。结合远震波形模拟产生精确的机制解和高精度的重新定位产生准确的震源有望改善我们对夏威夷群岛地震构造的看法，并将有助于地震危险性的评估。

Abstract for proposal EAR0106537 (PH #57x)Title: Local and teleseismic studies of Hawaiian earthquakesPI's: Cecily Wolfe, Univ HawaiiEarthquakes in Hawaii are abundant, and provide key information on the nature of magmatic and tectonic processes at this oceanic hotspot. There are shallow crustal earthquakes associated with magma intrusions and eruptions, earthquakes in the middle-to-upper lithospheric mantle suggested to reflect magma migration, earthquakes that relieve stresses due to volcano growth and volcano spreading. In addition, there are enigmatic crustal and mantle earthquakes that may be due to a variety of factors, including inherited zones of structural weakness, stresses due to volcano loading and lithospheric flexure, magma movement, and thermal cooling stresses. This project will conduct two studies: 1) waveform modeling of teleseismically-recorded earthquakes (Mw 4.5) in order to constrain earthquake mechanisms and moments throughout Hawaii, including in many regions where the United States Geological Observatory Hawaii Volcano Observatory seismic network geometry is insufficient to provide a first-motion mechanism; and 2) the relocation of locally-recorded seismicity for specific targets using high-precision techniques. The combination of teleseismic waveform modeling to yield accurate mechanism solutions and high precision relocations to yield accurate hypocenters promise to improve our view of the seismotectonics of the Hawaiian Islands and will aid in the evaluation of earthquake hazards.