Collaborative Research: Revealing interseismic crustal deformation in the fold-and-thrust belt in western Taiwan from geodesy and seismology

合作研究：从大地测量学和地震学揭示台湾西部褶皱冲断带震间地壳形变

• 批准号: 2026099
• 负责人: Mong-Han Huang
• 金额: $ 30.26万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2026099&HistoricalAwards=false
• 关键词: Collaborative; Research; Revealing; interseismic; crustal

Taiwan is one of the most active tectonic plate boundaries in the world. The high collision rate between the Philippine Sea Plate and the Eurasian Plate has built up a series of hills and mountains called a fold-and-thrust belt in western Taiwan. There have been at least 10 powerful earthquakes in this belt in the last 100 years. Every year, more than 1.6 inches of plate shortening is accommodated by this fold-and-thrust belt, making western Taiwan an ideal natural laboratory for understanding how mountains are built and earthquakes are generated. This three-year proposal supports two tenure-track early career faculty members and a female graduate student to broaden diversity in the Science, Technology, Engineering, and Mathematics (STEM) fields. Some of the products can be integrated into an outreach package for the Maryland Day open house event. This package is designed for the general public for learning active plate tectonics, earthquake cycles, and natural hazard in different tectonic environments. Additionally, this project promotes collaboration between several institutions in the US and Taiwan. The analyses and results of this work are directly relevant to seismic hazard assessment in western Taiwan. The team is merging geodetic and seismologic measurements in order to answer scientific questions such as: (1) What are the characteristics of surface deformation in the fold-and-thrust belt in Taiwan? (2) Is the orientation of the principal crustal shortening consistent at different depths in a fold-and-thrust belt? (3) Can we use seismology, geodesy, and numerical modeling to identify active faults and calculate slip budget in different parts of the fold-and-thrust belts in western Taiwan? The team uses more than 15 years of continuous Global Navigation Satellite Systems (cGNSS) and interferometric synthetic aperture radar (InSAR) displacement in order to estimate three-dimensional surface deformation with about hundred-feet spatial resolution in the Western Foothills in Taiwan. They also take advantage of the high-resolution seismic data from the Taiwanese seismic catalog to compare with GNSS and InSAR measurements. With these measurements combined, they can comprehensively analyze tectonic stress at different depths and investigate how aseismic and seismic fault motions with depth in an active fold-and-thrust belt. These joint surface deformation and crustal stress analyses bring further insights into the behavior of tectonic stress near the main detachment of a fold-and-thrust belt, and characterize earthquake potential below the main detachment.Funding to support this project is provided by the EAR Tectonics and EAR Geophysics Programs.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

台湾是世界上最活跃的板块边界之一。菲律宾海板块与欧亚板块的高速碰撞，在台湾西部形成了一系列丘陵和山脉，称为褶皱冲断带。在过去的100年里，这一带至少发生了10次强烈地震。每年，这个褶皱冲断带容纳了超过1.6英寸的板块缩短，使台湾西部成为了解山脉形成和地震发生的理想天然实验室。这项为期三年的提案支持两名终身制早期职业教师和一名女研究生，以扩大科学，技术，工程和数学（STEM）领域的多样性。其中一些产品可以整合到马里兰州日开放日活动的外展包中。本套教材是为大众设计，让他们学习不同构造环境下的活动板块构造、地震周期及自然灾害。此外，该项目还促进了美国和台湾几个机构之间的合作。本研究之分析与结果，对台湾西部地区之地震危险性评估有直接之参考价值。研究小组正将大地测量与地震测量结合起来，以解答下列科学问题：（1）台湾褶皱冲断带的地表变形特征是什麽？(2)褶皱冲断带中不同深度的主地壳缩短方向是否一致？(3)我们能否利用地震学、大地测量学和数值模拟来识别台湾西部褶皱冲断带不同部分的活动断层并计算滑动预算？该团队使用超过15年的连续全球导航卫星系统（cGNSS）和干涉合成孔径雷达（干涉合成孔径雷达）位移，以估计台湾西部丘陵地区约100英尺空间分辨率的三维表面变形。他们还利用台湾地震目录中的高分辨率地震数据与GNSS和干涉合成孔径雷达测量结果进行比较。这些测量结合起来，可以综合分析不同深度的构造应力，研究活动褶皱冲断带的地震和地震断层运动如何随深度变化。这些联合表面变形和地壳应力分析进一步了解了褶皱冲断带主拆离附近的构造应力行为，和表征地震潜在的主要支队以下。资金，以支持这一项目是由地质构造和地球物理计划提供的。这一奖项反映了NSF的法定使命，并已被认为是值得支持，通过评估使用基金会的知识优点和更广泛的影响审查标准。

项目成果

Icequake‐Magnitude Scaling Relationship Along a Rift Within the Ross Ice Shelf, Antarctica

冰震——南极洲罗斯冰架内裂谷沿线的震级关系

• DOI: 10.1029/2022gl097961
• 发表时间: 2022
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Huang, Mong‐Han;Udell Lopez, Kathrine;Olsen, Kira G.
• 通讯作者: Olsen, Kira G.

Revealing Crustal Deformation and Strain Rate in Taiwan Using InSAR and GNSS

• DOI: 10.1029/2022gl101306
• 发表时间: 2022-10
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Kathryn Franklin;Mong‐Han Huang

Refining the 2018 Mw 7.5 Papua New Guinea Earthquake Fault-Slip Model Using Subpixel Offset

使用子像素偏移细化 2018 Mw 7.5 巴布亚新几内亚地震断层滑动模型

• DOI: 10.1785/0120200250
• 发表时间: 2020
• 期刊: Bulletin of the Seismological Society of America
• 影响因子: 3
• 作者: Chong, Jeng-Hann;Huang, Mong-Han
• 通讯作者: Huang, Mong-Han