Post-Seismic Deformation for the 1999 IZMIT/DUZCE Turkey Earthquake Sequence

Robert E. Reilingergerg-0001095调查人员建议监测和分析1999年8月17日土耳其伊兹米特（M=7.4）和1999年11月12日土耳其杜兹切（M=7.1）地震的震后变形。这些地震共同导致了沿着北安纳托利亚断层西部150公里段的连续地表破裂，右侧地表偏移达到5米。这些事件的长期应变和同震断层滑动的严格限制和震后运动的早期阶段的详细监测，提供了一个重要的机会，以发展所需的观测约束模型的后滑和粘弹性松弛。区分这些机制可能的贡献有影响的大陆岩石层的流变性和局部流变性的断裂带-流变性，目前不受观测和建模与板块相互作用的动态过程是至关重要的约束。此外，预计这项研究的结果将增强我们对该构造区和类似构造区（如圣安德烈亚斯断层）地震周期机制的理解。虽然这项工作并不意味着是一个全面的研究，在这个地区的地震灾害，其结果将直接相关的估计分区的滑动在各个分支的NAF在马尔马拉地区。此外，同震和震后断层参数所提出的研究需要约束模型的应力转移到相邻的断层段，提供了一个改进的物理基础，估计地震灾害。

Robert E. ReilingerEAR-0001095The Investigators propose to monitor and analyze postseismic deformation for the 17 August 1999, Izmit (M=7.4) and the 12 November 1999, Duzce (M=7.1), Turkey earthquakes. Together, these earthquakes resulted in a continuous surface break along a 150-km segment of the western North Anatolian fault, with right-lateral surface offsets reaching 5 m. The tight constraints on secular strain and co-seismic fault slip for these events and the detailed monitoring of the early phase of post-seismic motions, provide an important opportunity to develop the observations needed to constrain models of after-slip and viscoelastic relaxation. Distinguishing the possible contributions of these mechanisms has implications for the rheology of the continental lithoshere and localized rheology in the fault zone - rheological properties that are currently poorly constrained by observations and that are critically important for modeling dynamic processes associated with plate interactions. In addition, it is anticipated that the results of this study will enhance our understanding of the mechanics of the earthquake cycle in this and similar tectonic regions (such as the San Andreas fault). While this work is not meant to be a comprehensive study of earthquake hazards in this area, the results will be directly relevant to estimating the partitioning of slip on the various branches of the NAF in the Marmara region. Furthermore, the co-seismic and post-seismic fault parameters resulting from the proposed research are needed to constrain models for stress transfer to adjacent fault segments, providing an improved physical basis for estimating earthquake hazards.