Shallow M5 counts showed no clear time excess near 95 deep M6.5 to below 8 earthquakes in 2001-2024

We tested delayed shallow event counts near 95 selected deep earthquakes in a fixed USGS ComCat snapshot. Centers had depth greater than 300 km and preferred magnitude 6.5 to below 8 in 2001-2024. M5 or larger neighbors were within 200 km horizontally and days 1-30 before or after each center. Seven shallow pairs occurred before and seven after. The mean difference was zero, with a conditional 95% three-year block interval of -0.076 to +0.099 pairs per center. Deep neighbors rose from 23 to 69, but their excess became uncertain when past-event isolation was removed. The result gives no clear delayed shallow large-event excess under the tested rules. It does not exclude immediate microearthquake triggering or establish a causal depth effect. Sparse counts, selection, regional dependence, mixed magnitude types and catalog revision limit inference. The package supplies code, source hashes, statistical summaries, uncertainty draws, a figure, an independent audit and a retrieval recipe. External event records remain outside the publication.

deep earthquakes · shallow earthquakes · ComCat · time asymmetry · null result · center selection