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Updated 2014-11-07 01:44:20 UTC

M 4.7 — 76 km ESE of Iwaki, Japan

Magnitude 4.7, depth 44.0 km, 2011-03-26 19:22:05 UTC.

MagnitudeM 4.7
Depth44.0 km
Felt reports—
Statusreviewed
TsunamiNo

Japan → · Iwaki →

Quake Pulse Activity Index

Activity trend

A high index means recent activity is high relative to the selected historical baseline. It does not mean that a larger earthquake is about to occur.

Quake Pulse Activity Index51/100Normal
Current 30 days42
Historical monthly median41.5
Historical percentileP51
M5+ in 30 days9
M6+ in 30 days1
Activity trendaround the historical range (+1%)
Baseline months: 60Last calculation: 2026-09-03 06:17:39How the index works →
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What to know

A short factual reading of this event from the available observations.

  • Magnitude M 4.7 at 44.0 km depth.
Counts describe detected earthquakes and are not a forecast or hazard assessment.
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Within the Quake Pulse database

Long-term comparisons are more robust at higher magnitudes because small-earthquake detection capability has changed over time.

Magnitude rank in database#83,655
Magnitude rank in country#6,890
M4.5+ within 250 km, ±15 days1,243
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Impact and context

Descriptive indicators available for this event and its surroundings.

10/100Limited context
Felt reports—
Max felt intensity (CDI)—
Instrumental intensity (MMI)—
PAGER alertNot available
Tsunami indicator—
USGS significance340
Depth contextShallow
Nearby major cityTokyo210 km · 14,000,000

Nearby major city

Tokyo210 km · 14,000,000

Displayed population is the indexed city population, not an estimate of people exposed.

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These indicators describe data available after detection. They are neither a forecast nor a direct estimate of damage or individual risk.

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Around this epicenter

Nearby events observed around this epicenter. Spatial proximity does not necessarily mean they belong to the same sequence.

50 km100 km250 km
M 4.7 · 76 km ESE of Iwaki, Japan · 100 kmInteractive 3D view of earthquakes within 100 km of M 4.7 · 76 km ESE of Iwaki, Japan.M 4.7 · 76 km ESE of Iwaki, JapanM 5.1 · 29 km ESE of ?arai, Japan · 88.1 kmM 4.6 · 77 km ESE of Iwaki, Japan · 1.7 kmM 4.5 · 30 km SE of Namie, Japan · 70.9 kmM 4.5 · 113 km ESE of Iwaki, Japan · 39.8 kmM 4.6 · 77 km ENE of Hasaki, Japan · 92.8 kmM 5.2 · 21 km NNE of Iwaki, Japan · 80.4 kmM 4.6 · 82 km ESE of Namie, Japan · 65.6 kmM 4.6 · 75 km ESE of Kitaibaraki, Japan · 18.7 kmM 5.6 · 20 km ENE of Namie, Japan · 99.3 kmM 5.0 · 113 km ESE of Namie, Japan · 80.5 kmM 4.5 · 117 km ENE of Hasaki, Japan · 68.0 kmM 4.5 · 21 km SE of Takahagi, Japan · 67.6 kmM 4.7 · 97 km NE of Hasaki, Japan · 49.7 kmM 4.5 · 157 km ESE of Iwaki, Japan · 80.5 kmM 4.6 · 31 km E of ?arai, Japan · 78.0 kmM 4.6 · 22 km ENE of Iwaki, Japan · 61.8 kmM 4.6 · 14 km NE of Kitaibaraki, Japan · 73.7 kmM 4.8 · 60 km ESE of Kitaibaraki, Japan · 23.8 kmM 4.6 · 72 km NE of Hasaki, Japan · 70.6 kmM 4.7 · 81 km E of ?arai, Japan · 50.3 kmM 4.5 · 47 km ESE of Takahagi, Japan · 44.4 kmM 4.5 · 46 km E of Namie, Japan · 76.4 kmM 4.7 · 79 km ESE of Kitaibaraki, Japan · 13.4 kmM 4.9 · 22 km E of Iwaki, Japan · 56.0 kmM 4.6 · 4 km NE of Iwaki, Japan · 75.1 kmM 4.6 · 25 km ESE of Namie, Japan · 84.9 kmM 4.8 · 28 km NE of Kashima-shi, Japan · 94.5 kmM 4.7 · 5 km NW of Iwaki, Japan · 81.6 kmM 5.0 · 128 km ESE of Namie, Japan · 87.0 kmM 4.6 · 19 km E of Namie, Japan · 91.1 kmM 4.8 · 163 km ESE of Iwaki, Japan · 86.7 kmM 4.8 · 22 km SSW of Namie, Japan · 88.9 kmM 4.5 · 2 km WNW of Iwaki, Japan · 79.3 kmM 4.6 · 9 km NW of Takahagi, Japan · 89.9 kmM 4.6 · 89 km ESE of Kitaibaraki, Japan · 18.6 kmM 5.1 · 74 km ESE of Iwaki, Japan · 7.1 kmM 4.6 · 127 km ENE of Hasaki, Japan · 87.7 kmM 5.1 · 22 km SE of Ishikawa, Japan · 96.9 kmM 4.7 · 168 km ESE of Iwaki, Japan · 92.3 kmM 4.5 · 36 km E of Iwaki, Japan · 50.7 kmM 4.7 · 129 km ESE of Namie, Japan · 72.0 kmM 4.6 · 110 km E of Namie, Japan · 88.2 kmM 4.9 · 102 km ESE of Takahagi, Japan · 44.1 kmM 4.5 · off the east coast of Honshu, Japan · 82.7 kmM 4.5 · 18 km E of Ishikawa, Japan · 97.7 kmM 4.5 · 19 km WNW of Iwaki, Japan · 95.1 kmM 4.6 · 58 km E of Kitaibaraki, Japan · 21.9 kmM 4.7 · 20 km ESE of Ishikawa, Japan · 96.1 kmM 4.6 · 39 km ESE of Namie, Japan · 67.3 kmM 4.5 · 21 km SSE of Ishikawa, Japan · 99.2 kmM 4.5 · 17 km WSW of Iwaki, Japan · 87.1 kmM 4.6 · 23 km SSE of Ishikawa, Japan · 99.3 kmM 4.5 · 19 km NNW of Kitaibaraki, Japan · 92.6 kmM 4.5 · 18 km W of Iwaki, Japan · 92.5 kmM 4.7 · 20 km NW of Kitaibaraki, Japan · 95.0 kmM 4.8 · 19 km SE of Ishikawa, Japan · 97.2 kmM 4.5 · 6 km NW of Takahagi, Japan · 87.0 kmM 4.5 · 12 km N of Kitaibaraki, Japan · 79.5 kmM 4.9 · 19 km E of Namie, Japan · 94.3 kmM 5.1 · 21 km E of Kitaibaraki, Japan · 58.6 kmM 4.6 · 118 km ESE of Namie, Japan · 76.9 kmM 4.5 · 53 km SE of Namie, Japan · 55.1 kmM 4.5 · 43 km ESE of Hitachi, Japan · 61.3 kmM 4.7 · 100 km ESE of Iwaki, Japan · 23.6 kmM 4.7 · 16 km ESE of Ishikawa, Japan · 99.5 kmM 4.5 · 52 km E of ?arai, Japan · 66.9 kmM 4.6 · 7 km W of Takahagi, Japan · 90.0 kmM 4.5 · 100 km ENE of Hasaki, Japan · 56.2 kmM 4.5 · 37 km ESE of Kitaibaraki, Japan · 45.5 kmM 5.1 · 109 km ESE of Iwaki, Japan · 36.4 kmM 4.7 · 62 km ESE of Namie, Japan · 55.0 kmM 4.9 · 24 km E of Kitaibaraki, Japan · 55.1 kmM 4.7 · 119 km ESE of Iwaki, Japan · 44.3 kmM 4.6 · 75 km ESE of Kitaibaraki, Japan · 19.6 kmM 4.7 · 110 km ESE of Iwaki, Japan · 35.8 kmM 4.5 · 69 km ESE of Namie, Japan · 64.0 kmM 4.5 · 37 km ESE of Takahagi, Japan · 53.1 kmM 4.9 · 4 km E of Hitachi, Japan · 84.9 kmM 4.7 · 47 km ESE of Namie, Japan · 64.9 kmM 4.9 · 121 km E of Namie, Japan · 93.7 kmM 4.7 · 112 km ESE of Iwaki, Japan · 38.3 kmM 4.5 · 113 km ESE of Takahagi, Japan · 44.9 kmM 4.7 · 30 km ESE of ?arai, Japan · 88.9 kmM 4.5 · 147 km ESE of Iwaki, Japan · 72.6 kmM 4.7 · 6 km WNW of Kitaibaraki, Japan · 85.4 kmM 4.6 · 28 km E of ?arai, Japan · 82.5 kmM 4.5 · 52 km NE of Hasaki, Japan · 84.9 kmM 4.6 · 53 km E of Namie, Japan · 89.3 kmM 5.1 · 103 km E of Iwaki, Japan · 50.8 kmM 4.5 · 12 km NW of Kitaibaraki, Japan · 90.4 kmM 4.7 · 133 km ESE of Iwaki, Japan · 60.2 kmM 5.1 · 116 km ESE of Iwaki, Japan · 44.7 kmM 4.8 · 130 km ESE of Namie, Japan · 82.6 kmM 4.9 · 35 km SE of Namie, Japan · 68.4 kmM 4.6 · near the east coast of Honshu, Japan · 97.6 kmM 4.9 · 110 km ESE of Iwaki, Japan · 39.5 kmM 4.6 · 9 km ENE of Kitaibaraki, Japan · 71.6 kmM 4.8 · 16 km WNW of Iwaki, Japan · 92.7 kmM 4.6 · 93 km NE of Hasaki, Japan · 55.3 kmM 4.7 · 41 km ESE of Hitachi, Japan · 65.0 km
M 4.7 · 76 km ESE of Iwaki, Japan100 km100 Recent earthquakes

Descriptive map centered on the epicenter; it does not represent felt intensity or risk.

Sequence context

No public sequence is currently associated with this event.

Nearby events · 100 km

M 5.129 km ESE of ?arai, Japan88.1 km · 2011-04-25 09:00:21 UTCM 4.677 km ESE of Iwaki, Japan1.7 km · 2011-04-25 06:41:25 UTCM 4.530 km SE of Namie, Japan70.9 km · 2011-04-23 20:05:00 UTCM 4.5113 km ESE of Iwaki, Japan39.8 km · 2011-04-23 11:38:13 UTCM 4.677 km ENE of Hasaki, Japan92.8 km · 2011-04-23 10:59:23 UTCM 5.221 km NNE of Iwaki, Japan80.4 km · 2011-04-22 15:25:17 UTCM 4.682 km ESE of Namie, Japan65.6 km · 2011-04-22 08:42:40 UTCM 4.675 km ESE of Kitaibaraki, Japan18.7 km · 2011-04-21 20:28:43 UTC
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USGS data evolution

Earthquake parameters can be revised after first publication. This timeline shows versions retained by Quake Pulse.

Revisions1
Magnitude change+0.0M 4.7 → M 4.7
Depth change+0.0 km
Last update6272326 min
2014-11-07 01:44:20 UTC2014-11-07 01:44:20 UTC

Explore related context

Related or nearby earthquakes

M 4.4 · 90 km ESE of Tomioka, Japan35 km · 2026-08-23 00:32:24 UTCM 4.5 · 37 km ESE of Iwaki, Japan41 km · 2026-10-07 00:22:41 UTCM 4.5 · 62 km E of Tomioka, Japan59 km · 2026-07-22 11:11:31 UTCM 4.5 · 90 km E of Tomioka, Japan63 km · 2026-05-08 20:11:23 UTC

Geographic context

CountryJapan →Nearby cityIwaki →

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Putting this earthquake in context

An earthquake record can change after the first automatic publication as additional stations contribute data and analysts refine the solution.

Interpret the numbers

Magnitude, depth, felt reports and status describe different parts of the event. None of them alone predicts the consequences for a specific city.

Important limits

If the earthquake creates a safety concern, follow local authorities and official warning channels rather than relying on a public data website.

Read the methodology →

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