Viscoelastic Fault-Based Model of Crustal Deformation for the 2023 Update to the U.S. National Seismic Hazard Model
Viscoelastic Fault-Based Model of Crustal Deformation for the 2023 Update to the U.S. National Seismic Hazard Model
复制标题
用于美国国家地震灾害模型 2023 年更新的基于粘弹性断层的地壳变形模型
DOI：
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发表时间：
2022
影响因子：
3.3
通讯作者：
F. Pollitz
中科院分区：
文献类型：
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作者：
F. Pollitz
2023年对国家地震灾害（NSHM）模型的更新是由几个变形模型提供的，这些模型提供了大地测量估计的断层滑动率。在这里，我描述了一个基于故障的模型，允许估计长期滑移率离散故障和分布的故障时刻释放。它是基于对地震周期的定量化，对孕震上地壳和韧性下地壳和地幔的粘弹性模型。我把它应用到一个大的数据集的水平和垂直的全球定位系统（GPS）在美国西部的震间速度，导致长期滑动率超过1000个活动断层定义的NSHM。一个合理的拟合GPS数据集实现了一组滑动率严格位于先验地质滑动率界限。通过“鬼瞬态”实施的时间依赖性的影响有深远的影响滑动率估计，往往会提高计算滑动率沿着北方和南部圣安德烈亚斯故障高达几毫米/年。
The 2023 update to the National Seismic Hazard (NSHM) model is informed by several deformation models that furnish geodetically estimated fault slip rates. Here I describe a fault-based model that permits estimation of long-term slip rates on discrete faults and the distribution of off-fault moment release. It is based on quantification of the earthquake cycle on a viscoelastic model of the seismogenic upper crust and ductile lower crust and mantle. I apply it to a large dataset of horizontal and vertical Global Positioning System (GPS) interseismic velocities in the western United States, resulting in long-term slip rates on more than 1000 active faults defined for the NSHM. A reasonable fit to the GPS dataset is achieved with a set of slip rates designed to lie strictly within a priori geologic slip rate bounds. Time-dependent effects implemented via a “ghost transient” have a profound effect on slip rate estimation and tend to raise calculated slip rates along the northern and southern San Andreas fault by up to several mm/yr.
代表美国西部大陆变形的密集块模型，用于 2023 年国家地震灾害模型更新
影响因子：
3.3
作者：
Evans, Eileen L.
通讯作者：
Evans, Eileen L.