Collaborative Research: Interpreting High Resolution Geodetic Data With Viscoelastic Models

Simons/Kennerstrom-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，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，我们将描述我们的估计岩石圈流变学的可用数据集的空间和时间尺度的敏感性。 我们强调模型周期上升/自旋上升，可变地震重复次数和流变学的现实变化的作用。 这一努力将使干涉合成孔径雷达和全球定位系统数据得到更有效的利用，以限制地质上合理的模型。我们将通过理论研究，我们学到的教训，具体的，以及约束的研究领域，包括兰德斯和赫克托矿地震后的震后变形和后裂谷变形在北方火山区，冰岛。 在本提案过程中开发的结果和程序将1）有助于最大限度地减少与不适当和/或地质上不可信的建模技术相关的不确定性，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）最终导致对深度流变特性的更准确估计，包括相关的不确定性。 这些推论可用于随后的二次分析，特别是那些将受益于明确评估模型和数据引起的不确定性，如断层相互作用的研究，估计断层滑动率从大地测量数据的地震危险性的目的，和时间相关的概率地震危险性评估。

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.