Seismic Playground
IRIS data
PET: Kamchatka, 2025-07-29. MDJ: DPRK test, 2017-09-03, at Mudanjiang. Vertical channels only. Pick an event below or use the audio (time-compressed).
Audio (time-compressed)
PET — Kamchatka
MDJ — Mudanjiang
Background
In frequency, explosions and earthquakes don't look the same. mb/Ms and spectrum shape were the classic shortcuts; on digitized tape-era data, FFTs were how you got there quickly. Today's monitoring stacks are bigger, but the idea underneath is familiar.