Complex Rupture and Triggered Aseismic Creep During the 14 August 2021 Haiti Earthquake From Satellite Geodesy
J. Maurer, Rishabh Dutta, Anne Vernon, Sanaz Vajedian
Abstract
Abstract The 2021 August 14 M W 7.2 Nippes, Haiti earthquake occurred 75 km west of the epicenter of the 2010 Leogane earthquake (Haiti) on the transpressive Caribbean ‐ North America plate boundary. We present an updated fault map for Hispaniola and model coseismic and early postseismic fault slip using Interferometric Synthetic Aperture Radar and pixel offsets. We find the earthquake ruptured multiple segments of the Enriquillo‐Plantain Garden Fault Zone. Slip occurred in two main sub‐events on either side of a restraining bend at Pic Macaya, with ∼2.7 m of peak reverse‐slip east of the bend. To the west, slip jumps the restraining bend and further ruptures with ∼1.2 m of left‐lateral slip. Afterslip in the 4 days following the event occurred at shallow depth and adjacent to the coseismic rupture areas and reached the surface east of Pic Macaya.