Magmatic and Tectonic Processes within Kilauea Volcano from Precise Earthquake Relocation and Numerical Modeling

鲁宾：这项研究是建立在最近在夏威夷基拉韦厄精确地震位置的成功基础上，以更多地了解火山内部岩浆和构造过程之间的相互作用。地震活动性与高变形率和良好的大地测量覆盖相结合，允许使用二维和三维弹性边界元模型定量解释地震重新定位结果。早在1991年，对火山东部裂谷的重新定位描绘了一条长2.5公里，但大部分高度只有100米的左侧走滑断裂带。这种显著的带状几何形状和长期的矩释放模式都与一个力学模型在数量上是一致的，在这个模型中，裂谷区的应力被1982年的岩脉入侵“重置”，随后被基拉韦厄深裂谷的地学推断运动所加载。这类模型对地震活动性带地震危险性的估计具有重要意义。这项研究是国家减少地震危害计划的一个组成部分。* * * ? ?

9614789 Rubin This research is to build on recent success with precise earthquake locations at Kilauea, Hawaii, to learn more about the interaction between magmatic and tectonic processes within the volcano. Seismicity combined with high deformation rates and good geodetic coverage permit quantitative interpretation of the earthquake relocation results using two- and three-dimensional elastic boundary element models. Earlier relocations from the volcano's east rift in 1991 delineate a left-lateral strike-slip fault zone that is 2.5 km long but only 100 m tall over much of its length. Both this remarkable ribbon-like geometry and the long-term pattern of moment release are in quantitative agreement with a mechanical model in which the rift-zone stress was "reset" by dike intrusion in 1982, and subsequently loaded by geodetically-inferred motion of Kilauea's deep rift. These types of models are of importance to estimation of earthquake hazards in this seismically active zone. This research is a component of the National Earthquake Hazard Reduction Program. *** ??