A 2 km depth-error cut leaves 337 of 338 Stanley events at exactly 10 km depth for M 2.5 or more on days 1 to 30

We tested a depth-error cut in a fixed USGS Stanley catalog on elapsed days [1,30) after the 2020 M6.5 event. At preferred M >= 2.5, 337 of 385 events report exactly 10 km depth. A reported depth-error cut of 2 km keeps 338 events, of which 337 have depth exactly 10 km. The depth standard deviation falls from 1.433 to 0.272 km. At M >= 3, all 98 retained events have depth 10 km. Three selected 10 km origin records label depth as operator assigned; three selected other-depth records label it as from location. Thus, this error cut does not remove the depth spike and can leave almost no depth variation. This is a descriptive catalog audit, not evidence for a thin fault layer or depth recovery. Only six origin types were checked. Selection, missing events and revised preferred parameters limit general use. The package contains the raw snapshot, source hashes, code, derived tables, a figure, and independent arithmetic and repeat checks.

Stanley Idaho · earthquake depth · catalog audit · fixed depth · depth error