Spatial spread rose by 28% within 100 km in a relocated M3+ Haiti catalog between days 7-30 and 30-90 in 2021

We tested spatial change in the GEOAZUR relocated catalog for the 2021 Haiti earthquake. For magnitude at least 3 within 100 km, centered RMS spread rose from 25.62 km on days [7,30) to 32.77 km on days [30,90). The samples contain 113 and 128 events. The ratio was 1.279, with a three-day block weight interval of 1.103-1.513. Within 50 km, the ratio was 1.092 and the interval included one. The outer event share rose from 18.6% to 43.0%. An exploratory symmetric decomposition assigned 58.6% of the variance increase to this change in regional weights. Magnitude, location uncertainty, and start-day checks retained the 100 km increase. These are conditional catalog results. They do not establish fluid motion, triggering, stable detection, or local fault growth. We provide code, aggregate evidence, source hashes, an independent arithmetic audit, and a retrieval script. External raw records remain outside the package.

Haiti · aftershocks · spatial spread · catalog selection · variance decomposition