Reviewed by USGSRussia30y ago
M4.0 earthquake 166 km E of Kuril’sk, Russia
Sunday, April 21, 1996, 00:42:41 UTC · 45.155°N, 149.999°E
A magnitude 4.0 earthquake struck 166 km E of Kuril’sk, Russia on Sunday, April 21, 1996, 00:42:41 UTC, at a depth of 51.6 km (shallow).
- Magnitude
- 4.0
- Light · mb
- Depth
- 52 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
103 km
from the nearest mapped plate boundary, between the Okhotsk and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
52 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 50 km
USGS lists 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.2 on April 26, 1996. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 1,589 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.51963 Kuril Islands EarthquakeOctober 13, 1963 · 51 km SW of this epicenter
- 8.31958 Kuril Islands EarthquakeNovember 6, 1958 · 141 km SW of this epicenter
- 8.348 km E of Shikotan, RussiaOctober 4, 1994 · 262 km SW of this epicenter
- 8.21969 Hokkaido Toho-oki EarthquakeAugust 11, 1969 · 257 km SW of this epicenter
- 8.11918 Kuril Islands EarthquakeSeptember 7, 1918 · 183 km E of this epicenter
- 7.9128 km ESE of Kuril’sk, RussiaDecember 3, 1995 · 78 km SW of this epicenter
- 7.8east of the Kuril IslandsNovember 8, 1918 · 161 km E of this epicenter
- 7.8217 km ESE of Kuril’sk, RussiaOctober 20, 1963 · 64 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 38 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 46 recorded deaths. The most severe:
- 1918M8.3
Kuril Islands
7 Sep 1918 · 123 km away
23 deathsModerate damage ($1–5M)tsunami
- 1780M7.5
Kuril Islands
29 Jun 1780 · 95 km away
12 deathsLimited damage (under $1M)tsunami
- 1994M8.3
Kuril Islands; Japan: Hokkaido
4 Oct 1994 · 262 km away · intensity IX
11 deathsSevere damage ($5–24M)tsunami
- 1958M8.3
Kuril Islands
6 Nov 1958 · 134 km away · intensity X
Moderate damage ($1–5M)tsunami
- 1969M8.2
Shikotan Island, Kurilskiye
11 Aug 1969 · 240 km away · intensity IX
Moderate damage ($1–5M)tsunami
- 1978M7.5
Kuril Islands
6 Dec 1978 · 276 km away · intensity VIII
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.