The identifier 2021-11-11_0gwbqph3dvtcjnijexq2x_source-SKeoyyR represents a structured, unique system record generated on November 11, 2021, used for tracking and data auditing. It consists of a date stamp, a 20-character alphanumeric hash for uniqueness, and an origin label (source-SKeoyyR). For more details, visit Singular . Overview — FDSN Source Identifiers