Geodetic constraints of strain partitioning across the Pacific Northwest, USA

At the Cascadia subduction zone, the Juan de Fuca plate (JdF) subducts obliquely under, and deforms, the North American plate (NA). Subduction deformation dominates deformation on land, as observed by geodetic measurements such as the Global Navigation Satellite System (GNSS, including GPS), limiting the resolution of deformation due to surface faults on the overriding North American plate. A kinematic block model applied to oblique JdF-NA convergence interprets deformation in terms of microplate rotations and elastic deformation on locked and partially locked faults, revealing partitioning between surface faults in the Pacific Northwest region and the subduction zone interface. Beginning with an initially dense block model, an L1 regularization known as Total Variation Regularization (TVR) algorithmically selects the most active faults. We find a tradeoff between megathrust activity and surface fault activity: A megathrust constrained to dip-slip-only requires more active surface faul..., , , # Geodetic Analysis of Strain Partitioning across the Pacific Northwest, USA

[https://doi.org/10.5061/dryad.3n5tb2rsj](https://doi.org/10.5061/dryad.3n5tb2rsj)

This repository contains additional details of total variation regularization (TVR) results for the 6 block model results and an Excel sheet of the fault slip rates. The required inputs are in the repository as block folder, mesh folder, segment data, command textfile, and station data. These folders are the output results and block model inputs as described in the Block format ([https://github.com/jploveless/Blocks/wiki](https://github.com/jploveless/Blocks/wiki)). The 6 different block model results are identified as follows: 

## List of the block model results (folders)

Reference models are the models used to describe the results. Comparison models include the higher λ and lower λ as shown in the paper. Each folder contains information on the velocities of the respective block model results (Mod), Residual (Res), Observati...

# 美国太平洋西北地区应变分配大地测量分析
在卡斯卡迪亚俯冲带（Cascadia subduction zone）中，胡安德富卡板块（Juan de Fuca plate, JdF）以斜向俯冲模式俯冲到北美板块（North American plate, NA）之下，并使北美板块发生形变。如包含GPS在内的全球导航卫星系统（Global Navigation Satellite System, GNSS）等大地测量观测结果显示，俯冲形变主导了该区域的陆面形变，这也限制了对仰冲的北美板块浅表断层引发的形变的分辨能力。针对胡安德富卡-北美板块斜向汇聚过程构建的运动学块体模型（kinematic block model），通过微板块旋转以及闭锁、半闭锁断层上的弹性形变来解释该区域的形变模式，揭示了美国太平洋西北地区浅表断层与俯冲带界面之间的形变分配机制。我们从初始稠密块体模型出发，借助名为总变分正则化（Total Variation Regularization, TVR）的L1正则化算法，筛选出活动性最强的断层。研究发现巨型逆冲断层（megathrust）活动与浅表断层活动之间存在权衡关系：仅限定为倾滑运动的巨型逆冲断层需要更多活跃的浅表断层……

[https://doi.org/10.5061/dryad.3n5tb2rsj](https://doi.org/10.5061/dryad.3n5tb2rsj)

本仓库包含6组块体模型结果对应的总变分正则化（TVR）详细结果，以及断层滑动速率的Excel表格。所需的输入数据以文件夹形式存储于本仓库中，包括块体文件夹、网格文件夹、分段数据、命令文本文件与测站数据。这些文件夹包含了块体格式（Block format）文档（[https://github.com/jploveless/Blocks/wiki](https://github.com/jploveless/Blocks/wiki)）中所述的输出结果与块体模型输入数据。6组不同的块体模型结果命名如下：

## 块体模型结果（文件夹）列表
参考模型为用于阐述本研究结果的模型，对比模型则包含论文中提及的高λ与低λ两种参数设置。每个文件夹均包含对应块体模型结果的速度信息（Mod）、残差（Res）及观测数据……