Reviewed by USGSRussia69y ago
M7.6 earthquake 66 km SSE of Klyuchi, Russia
Sunday, October 27, 1957, 22:32:42 UTC · 55.750°N, 161.134°E
A magnitude 7.6 earthquake struck 66 km SSE of Klyuchi, Russia on Sunday, October 27, 1957, 22:32:42 UTC, at a depth of 147.8 km (intermediate). It is the strongest earthquake within 300 km since an M8.4 on February 3, 1923.
- Magnitude
- 7.6
- Major · mw
- Depth
- 148 km
- Intermediate
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
3.8 megatons of TNT
That is about 252 times the Hiroshima bomb. It released about 7,943 times the energy of a magnitude 5.0.
Tectonic setting
117 km
from the nearest mapped plate boundary, between the Okhotsk and North American plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: intermediate
148 km
Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.
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 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 92 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.41923 Kamchatka, Russia EarthquakeFebruary 3, 1923 · 147 km S of this epicenter
- 8.043 km E of Ust’-Kamchatsk Staryy, RussiaJanuary 30, 1917 · 135 km E of this epicenter
- 7.8off the east coast of the Kamchatka Peninsula, RussiaSeptember 15, 1905 · 176 km E of this epicenter
- 7.497 km SSE of Ust’-Kamchatsk Staryy, RussiaFebruary 24, 1923 · 136 km E of this epicenter
- 7.3233 km SE of Atlasovo, RussiaJuly 31, 1915 · 199 km S of this epicenter
- 7.361 km ESE of Ust’-Kamchatsk Staryy, RussiaNovember 13, 1936 · 144 km E of this epicenter
- 7.377 km ESE of Mil’kovo, RussiaFebruary 3, 1923 · 182 km SW of this epicenter
- 7.3163 km ENE of Petropavlovsk-Kamchatsky, RussiaFebruary 2, 1923 · 225 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 15 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 21 recorded deaths. The most severe:
- 1923M7.2
Near Kamchatka
13 Apr 1923 · 119 km away · intensity X
18 deathsSevere damage ($5–24M)tsunami
- 1923M8.4
Kamchatka
3 Feb 1923 · 147 km away · intensity XI
3 deaths$2 million damagetsunami
- 1923M7.7
Kamchatka Peninsula
24 Feb 1923 · 116 km away
Limited damage (under $1M)
- 1943M7.6
Kamchatka
28 Nov 1943 · 290 km away
Limited damage (under $1M)
- 1936M7.3
Near Kamchatka
13 Nov 1936 · 191 km away · intensity X
Limited damage (under $1M)tsunami
- 1792M8.4
Near Kamchatka
22 Aug 1792 · 202 km away · intensity XI
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.