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Sentinel-1 InSAR Analysis Reveals Longer Periods of Creep and the Segmentation of Enriquillo Plantain Garden Fault Following the 2021 M7 Nippes, Haiti

Description: 

The 14 August 2021 M_w 7.2 Nippes, Haiti earthquake ruptured the Enriquillo Plantain Garden Fault zone (EPGF) on the Southern Peninsula of Haiti. Following the mainshock, postseismic investigations using L-band ALOS-2 and C-band Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) have identified triggered creeping segments of the EPGF and thrust faults. These segments either took part in the rupture or were adjacent to the rupture. Using Sentinel-1 time series analysis we show that triggered shallow creep continued longer both in time and space than previously estimated. We found segments of the EPGF that creep for up to 300 days and the creeping segments extend from the rupture area to well into the Miragoâne pull-apart. We also found along-strike variability in the duration of creep, highlighting the segmentation of the EPGF. We compare the observed creep to the relocated aftershocks of Douilly et al. (2023) and the series of M5+ earthquakes that occurred on the Southern Peninsula 4 months after the mainshock. We find that the creep is not aseismic and possibly triggered the M5+ earthquake series. This has implications for the loading and seismogenic potential of the off-EPGF faults following large earthquakes and the velocity strengthening or weakening properties of the fault system and the seismogenic potential of the fault system.

Session: Exploring the Complexity of Fault Discontinuities - I

Type: Oral

Date: 4/17/2025

Presentation Time: 02:30 PM (local time)

Presenting Author: Machel

Student Presenter: No

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