8.7% of strong earthquakes start deeper than 300 km
From 1970 to 2025 the catalogue lists 772 earthquakes of magnitude 7 or more; 67 of them began 300 km down or deeper.
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Deep events form a distinct part of this slice. The share is conditional on reported depth and the magnitude threshold, and does not describe all earthquakes.
Bars share one scale. The source values and their units are listed below.
- Depth ≥300 km events
67 (1970–2025)
- Reported depth events
772 (1970–2025)
- All events in the slice events
772 (1970–2025)
USGS ComCat: published earthquake-type events, M≥7, from 1900-01-01 through 2026-10-01. Magnitude type, date, network and errors retained. Historical completeness varies; the catalogue does not measure damage or deaths. Restrict dates to completed years 1970–2025. Numerator: depth≥300 km; denominator: events with non-null depth. Missing depth appears separately.
USGS ComCat earthquake-type events with published magnitude ≥7, 1900-01-01 ≤ date ≤ 2026-10-01. Preferred catalogue magnitude, with scale type retained. Hypocentre depth, not damage depth; reported errors are preserved. Historical completeness, accuracy and networks vary. The catalogue does not prove an increase in true event incidence or damage; counts refer to the stated filter. The logarithmic 10^(1.5ΔM) relation is an approximate educational energy ratio, not measured energy per event, local shaking or mortality.
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