RAPID: Sentinel-1 and ALOS-2 InSAR interferograms to support community modeling, mapping, and estimation of hazards from strike-slip and thrust fault interactions in Haiti.

RAPID：Sentinel-1 和 ALOS-2 InSAR 干涉图支持对海地走滑和逆冲断层相互作用造成的危害进行群落建模、测绘和估计。

• 批准号: 2150704
• 负责人: Jennifer Haase
• 金额: $ 3.16万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-15 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2150704&HistoricalAwards=false
• 关键词: RAPID; Sentinel; ALOS; InSAR; interferograms

This RAPID project supports the analysis of satellite data following the August 14, 2021, Haiti earthquake (M=7.2) by combining Sentinel-1 and ALOS-2 InSAR observations. The analysis will allow preliminary interpretation of the interaction of strike-slip and thrust faults that rupture during the Haiti earthquake sequence. Systematic release of preliminary and refined images as each new satellite pass occurs (~5-7 days) and as the aftershock sequence and supporting field work takes place. InSAR, along with aftershock relocations, will be critical to help define the fault geometry necessary for understanding the rupture and subsequent stress changes on adjacent faults. Updated images will be released right after each acquisition (https://topex.ucsd.edu/haiti_7.2/). Early distribution of these data to local field scientists informs geologic mapping that will contribute to collecting ephemeral data on surface slip. Higher accuracy InSAR observations produced using the GMTSAR package, with stacking and noise reduction, combining data from Sentinel-1 and ALOS-2, are critical for future modeling efforts. The method increases the accuracy of InSAR line-of-sight (LoS) deformation maps while providing data products to help researchers identify ancillary fault structures with co- and post-seismic slip that will be constrained at large scale by available GPS data. The InSAR imagery can help resolve how significant the component of dip slip on the eastern segment of the Enriquillo Plantain Gardens Fault is and how its interaction with thrust faults is a major factor controlling this fault segmentation and thus impacts the seismic hazard in this trans-pressive boundary of the Caribbean plate. This project will support a female graduate student who will process the images weekly.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.

该RAPID项目通过结合Sentinel-1和ALOS-2干涉合成孔径雷达观测，支持对2021年8月14日海地地震（M=7.2）后的卫星数据进行分析。 该分析将允许初步解释的相互作用的走滑和逆冲断层，在海地地震序列破裂。 在每次新的卫星经过时（约5-7天），以及在余震序列和支持性实地工作发生时，系统地发布初步和精确图像。干涉合成孔径雷达，沿着余震的重新定位，将是至关重要的，以帮助确定断层的几何形状，了解破裂和随后的应力变化对邻近的断层。每次采集后将立即发布更新的图像（https：//topex.ucsd.edu/haiti_7.2/）。将这些数据及早分发给当地的野外科学家，为地质测绘提供信息，这将有助于收集关于地表滑动的短暂数据。使用GMTSAR软件包进行更高精度的干涉合成孔径雷达观测，并进行叠加和降噪，结合Sentinel-1和ALOS-2的数据，对今后的建模工作至关重要。 该方法提高了干涉合成孔径雷达的视线（LoS）变形图的精度，同时提供数据产品，以帮助研究人员确定辅助断层结构的同震和震后滑动，将在大规模的限制，由现有的GPS数据。干涉合成孔径雷达图像可帮助确定Enriquillo Plantain Gardens断层东段的倾向滑动分量有多重要，以及它与逆冲断层的相互作用是如何成为控制这一断层分段的主要因素，从而影响加勒比板块这一挤压边界的地震危险。 该项目将支持一名女研究生，她将每周处理图像。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。