QuakeScout
Magnitude3.1

Reviewed by USGSAlaska4y ago

M3.1 earthquake 198 km SE of Chignik, Alaska

Thursday, June 30, 2022, 14:35:15 UTC · 54.989°N, 156.262°W

A magnitude 3.1 earthquake struck 198 km SE of Chignik, Alaska on Thursday, June 30, 2022, 14:35:15 UTC, at a depth of 3.9 km (shallow).

Magnitude
3.1
Minor · ml
Depth
4 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

674 kg of TNT

That is about 1/22,353 of the Hiroshima bomb. A magnitude 5.0 releases about 708 times more energy.

Tectonic setting

49 km

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

Depth: shallow

4 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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M2.6 on July 10, 2022. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M31h6h1d3d7d14d30dMainshock M3.1
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 2.6206 km SE of Perryville, Alaska4y ago · 50 km SW of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 347 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 8.21938 Semidi Islands, Alaska EarthquakeNovember 10, 1938 · 124 km W of this epicenter
  2. 8.22021 Chignik, Alaska EarthquakeJuly 29, 2021 · 111 km NW of this epicenter
  3. 7.82020 Perryville, Alaska EarthquakeJuly 22, 2020 · 149 km W of this epicenter
  4. 7.62020 Sand Point, Alaska EarthquakeOctober 19, 2020 · 220 km W of this epicenter
  5. 7.454 km SE of Sand Point, AlaskaMay 31, 1917 · 231 km W of this epicenter
  6. 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 100 km N of this epicenter
  7. 7.026 km SSE of Karluk, AlaskaDecember 6, 1999 · 287 km NE of this epicenter
  8. 7.0164 km SE of Chignik, AlaskaSeptember 4, 1989 · 39 km N 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. The most severe:

  1. 1900M8.3

    Kodiak Island

    9 Oct 1900 · 291 km away · intensity VIII

    Limited damage (under $1M)

  2. 2020M7.8

    Alaska

    22 Jul 2020 · 149 km away · intensity VII

    Limited damage (under $1M)tsunami

  3. 1938M8.2

    Alaska

    10 Nov 1938 · 144 km away · intensity VI

    tsunami

  4. 2021M8.2

    Alaska Peninsula

    29 Jul 2021 · 107 km away · intensity VIII

    tsunami

  5. 1906M7.6

    Aleutian Islands

    23 Dec 1906 · 254 km away

  6. 2020M7.6

    Alaska

    19 Oct 2020 · 220 km away · intensity IX

    tsunami

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

Nearby trackers

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