Collaborative Research: Interpreting High Resolution Geodetic Data With Viscoelastic Models

SIMONS/KennerEAR-0229868/0229793合作研究：用粘弹性模型解释高分辨率大地测量数据摘要该项目是一项合作努力，旨在弥合现代数据集和现代建模技术之间的差距，努力提高我们阐明活动构造带内流变结构的能力。特别是，我们将表征我们对岩石圈流变性的估计对可用数据集的空间和时间尺度的敏感性。我们强调了模型循环和旋转的作用，可变的地震重复次数，以及实际的流变学变化。这一努力将允许更有效地使用InSAR和GPS数据，以约束地质上合理的模型。我们将把我们从理论研究中学到的经验应用到特定的、受到良好约束的研究区域，包括兰德斯和赫克托矿震后的震后变形以及冰岛北部火山带的裂谷后变形。在本提案过程中开发的结果和程序将有助于1)将与不适当和/或在地质上不可信的建模技术相关的不确定性降至最低，2)允许对独立调查人员推断的流变结构进行定量比较，以及3)最终导致对深部流变特性的更准确估计，包括相关的不确定性。这些推论然后可用于随后的二次分析，特别是那些将受益于对模型和数据引起的不确定性的明确评估的分析，例如断层相互作用的研究，用于地震危险目的的大地测量数据的断层滑移率估计，以及依赖于时间的概率地震危险评估。

Simons/KennerEAR-0229868/0229793Collaborative Research: Interpreting High Resolution Geodetic Data with Viscoelastic ModelsAbstractThis project is a collaborative effort bridging the gap between modern datasets and modern modeling techniques, in an effort to improve our ability to elucidate rheological structure within active tectonic zones. In particular, we will characterize the sensitivity of our estimates of lithospheric rheology to the spatial and temporal scale of available datasets. We emphasize the role of model cycle-up/spin-up, variable earthquake repeat times, and realistic variations in rheology. This effort will allow for the more effective use InSAR and GPS data, to constrain geologically reasonable models. We will apply the lessons we learn through theoretical studies to specific, well-constrained study areas, including postseismic deformation following the Landers and Hector Mine earthquakes and post-rifting deformation in the Northern Volcanic Zone, Iceland. The results and procedures developed during the course of this proposal will 1) help to minimize uncertainties associated with improper and/or geologically implausible modeling techniques, 2) allow quantitative comparison of rheological structures inferred by independent investigators, and 3) ultimately lead to more accurate estimates of rheological properties at depth, including associated uncertainties. These inferences can then be used in subsequent secondary analyses, particularly those that would benefit from an explicit assessment of model and data induced uncertainties, such as studies of fault interaction, estimation of fault slip-rates from geodetic data for seismic hazard purposes, and time-dependent probabilistic seismic hazard assessments.