QuakeScout
Magnitude7.7

Reviewed by USGSRussia124y ago

M7.7 earthquake 115 km ESE of Petropavlovsk-Kamchatsky, Russia

Saturday, June 25, 1904, 21:00:38 UTC · 52.763°N, 160.277°E

A magnitude 7.7 earthquake struck 115 km ESE of Petropavlovsk-Kamchatsky, Russia on Saturday, June 25, 1904, 21:00:38 UTC, at a depth of 30.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude
7.7
Major · mw
Depth
30 km
Shallow
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 earthquakeDashed circle: 200 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)

In context

How big was it, and why here?

Energy released

5.4 megatons of TNT

That is about 355 times the Hiroshima bomb. It released about 11,220 times the energy of a magnitude 5.0.

Tectonic setting

76 km

from the nearest mapped plate boundary, between the Okhotsk and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: shallow

30 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 200 km

USGS lists 3 M2.5+ earthquakes within 200 km in the following 30 days; the largest was M7.2 on June 27, 1904. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M4M5M6M7M81h6h1d3d7d14d30dMainshock M7.7
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 6.797 km SE of Mil’kovo, Russia123y ago · 148 km N of this epicenter
  2. 7.2143 km E of Petropavlovsk-Kamchatsky, Russia124y ago · 70 km NE of this epicenter
  3. 6.2155 km E of Petropavlovsk-Kamchatsky, Russia124y ago · 46 km E of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 2 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.5274 km SE of Petropavlovsk-Kamchatsky, RussiaJune 25, 1904 · 176 km SE of this epicenter
  2. 6.1162 km ESE of Ozernovskiy, RussiaJune 24, 1904 · 223 km SW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 9 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 100 recorded deaths. The most severe:

  1. 1737

    Kamchatka

    16 Oct 1737 · 242 km away

    100 deathstsunami

  2. 1841M8.4

    Off Kamchatka

    17 May 1841 · 176 km away · intensity XI

    Moderate damage ($1–5M)tsunami

  3. 1904M8.3

    Off Kamchatka

    25 Jun 1904 · 121 km away · intensity X

    Limited damage (under $1M)tsunami

  4. 1904M8.1

    Off Kamchatka

    25 Jun 1904 · 121 km away · intensity X

    Limited damage (under $1M)tsunami

  5. 1827

    Kamchatka

    9 Aug 1827 · 122 km away

    Limited damage (under $1M)tsunami

  6. 1792M8.4

    Near Kamchatka

    22 Aug 1792 · 179 km away · intensity XI

    tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers

Closest city pages