Collaborative Research: Interpreting High Resolution Geodetic Data With Viscoelastic Models

合作研究：用粘弹性模型解释高分辨率大地测量数据摘要本项目是一个弥合现代数据集和现代建模技术之间差距的合作项目，旨在提高我们阐明活动构造带流变结构的能力。特别是，我们将描述我们对岩石圈流变的估计对可用数据集的时空尺度的敏感性。我们强调模型循环/自旋上升的作用，可变的地震重复时间，以及流变学的现实变化。这项工作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具体的、约束良好的研究领域，包括兰德斯和赫克托雷地震后的地震变形和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1)有助于减少与不适当和/或地质上不合理的建模技术相关的不确定性，2)允许独立研究人员推断的流变结构的定量比较，以及3)最终导致更准确的深度流变特性估计，包括相关的不确定性。这些推论可以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动率估计，以及时间相关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.