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Updated 2022-07-19 12:38:35 UTC

M 4.6 — 122 km ESE of Ishinomaki, Japan

Magnitude 4.6, depth 23.5 km, 2011-04-17 17:34:20 UTC.

MagnitudeM 4.6
Depth23.5 km
Felt reports7
Statusreviewed
TsunamiNo

Japan → · Ishinomaki →

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 4.6 at 23.5 km depth.
  • 7 felt report(s) are associated with the USGS record.
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#109,443
Magnitude rank in country#9,330
M4.5+ within 250 km, ±15 days316
Sequence context138 events →
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Impact and context

Descriptive indicators available for this event and its surroundings.

15/100Limited context
Felt reports7
Max felt intensity (CDI)3.4
Instrumental intensity (MMI)—
PAGER alertNot available
Tsunami indicator—
USGS significance328
Depth contextShallow
Nearby major cityTokyo366 km · 14,000,000

Nearby major city

Tokyo366 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 4.6 · 122 km ESE of Ishinomaki, Japan · 100 kmInteractive 3D view of earthquakes within 100 km of M 4.6 · 122 km ESE of Ishinomaki, Japan.M 4.6 · 122 km ESE of Ishinomaki, JapanM 4.5 · 46 km ESE of Ishinomaki, Japan · 76.9 kmM 4.7 · 146 km E of Namie, Japan · 70.2 kmM 4.8 · 155 km ESE of Ishinomaki, Japan · 38.5 kmM 5.1 · 145 km E of Namie, Japan · 85.4 kmM 4.6 · 218 km ESE of Ishinomaki, Japan · 95.3 kmM 4.8 · 38 km ENE of Ishinomaki, Japan · 94.8 kmM 4.5 · 141 km ESE of Ishinomaki, Japan · 19.1 kmM 5.2 · 209 km ESE of Ishinomaki, Japan · 86.7 kmM 4.7 · 51 km ESE of Ishinomaki, Japan · 72.0 kmM 4.6 · 205 km SE of ?funato, Japan · 85.1 kmM 4.6 · 214 km ESE of Ishinomaki, Japan · 91.6 kmM 5.0 · 77 km ESE of Ishinomaki, Japan · 45.3 kmM 5.2 · 209 km ESE of Ishinomaki, Japan · 87.2 kmM 4.6 · 222 km ESE of Ishinomaki, Japan · 99.3 kmM 4.5 · 216 km ESE of Ishinomaki, Japan · 94.3 kmM 5.6 · 199 km ESE of Onagawa Ch?, Japan · 87.2 kmM 4.8 · 89 km SE of ?funato, Japan · 59.9 kmM 4.5 · 142 km ESE of Kamaishi, Japan · 85.4 kmM 4.8 · 144 km E of Namie, Japan · 69.5 kmM 4.7 · 140 km E of Namie, Japan · 84.1 kmM 4.7 · 157 km SE of Ishinomaki, Japan · 46.2 kmM 4.7 · 130 km ESE of Ishinomaki, Japan · 9.7 kmM 4.5 · 85 km SE of Ishinomaki, Japan · 61.5 kmM 4.5 · 126 km ESE of Namie, Japan · 94.0 kmM 4.6 · 220 km ESE of Ishinomaki, Japan · 97.7 kmM 4.8 · 67 km E of Ishinomaki, Japan · 58.9 kmM 4.7 · 50 km SSE of ?funato, Japan · 93.9 kmM 4.8 · 120 km E of Namie, Japan · 57.0 kmM 4.8 · 127 km E of Namie, Japan · 59.8 kmM 4.6 · 133 km ESE of Ishinomaki, Japan · 20.9 kmM 4.5 · 156 km ESE of Namie, Japan · 96.2 kmM 5.0 · 42 km SE of Ishinomaki, Japan · 84.9 kmM 4.6 · 41 km E of Ishinomaki, Japan · 84.4 kmM 4.7 · 49 km ESE of Ishinomaki, Japan · 73.7 kmM 4.9 · 180 km ESE of ?funato, Japan · 81.5 kmM 4.6 · 55 km SE of Ishinomaki, Japan · 79.8 kmM 4.7 · 46 km SSE of ?funato, Japan · 95.4 kmM 4.7 · 41 km ENE of Ishinomaki, Japan · 91.6 kmM 5.0 · 70 km E of Ishinomaki, Japan · 56.8 kmM 4.5 · 114 km ESE of Kamaishi, Japan · 94.0 kmM 5.0 · 113 km ESE of Namie, Japan · 88.8 kmM 4.7 · 38 km SE of Ishinomaki, Japan · 86.2 kmM 4.6 · 58 km ENE of Ishinomaki, Japan · 82.6 kmM 4.7 · 67 km SE of ?funato, Japan · 74.3 kmM 4.5 · 60 km ESE of Ishinomaki, Japan · 62.9 kmM 5.0 · 128 km ESE of Namie, Japan · 90.7 kmM 4.5 · 81 km E of Ishinomaki, Japan · 45.7 kmM 4.6 · 162 km ESE of Ishinomaki, Japan · 43.7 kmM 4.6 · 110 km E of Namie, Japan · 79.2 kmM 4.7 · 46 km ESE of Ishinomaki, Japan · 76.0 kmM 4.5 · 186 km E of Namie, Japan · 72.5 kmM 4.7 · 53 km ENE of Ishinomaki, Japan · 92.8 kmM 4.7 · 44 km E of Ishinomaki, Japan · 80.8 kmM 4.5 · 137 km E of Namie, Japan · 44.0 kmM 4.5 · 101 km ESE of Ishinomaki, Japan · 22.6 kmM 4.7 · 132 km SE of Ishinomaki, Japan · 30.4 kmM 4.6 · 118 km ESE of Namie, Japan · 96.0 kmM 4.5 · 47 km ESE of Ishinomaki, Japan · 75.0 kmM 4.6 · 47 km E of Ishinomaki, Japan · 76.6 kmM 4.6 · 214 km ESE of Ishinomaki, Japan · 91.3 kmM 4.7 · 139 km SE of ?funato, Japan · 37.6 kmM 5.3 · 38 km ESE of Ishinomaki, Japan · 84.5 kmM 4.6 · 49 km ENE of Ishinomaki, Japan · 96.9 kmM 4.5 · 100 km SE of Ishinomaki, Japan · 33.2 kmM 4.7 · 214 km ESE of Ishinomaki, Japan · 92.3 kmM 4.5 · 55 km ESE of Ishinomaki, Japan · 67.8 kmM 4.6 · 86 km ESE of Ishinomaki, Japan · 38.2 kmM 4.5 · 52 km ESE of Ishinomaki, Japan · 70.3 kmM 4.7 · 101 km ESE of Ishinomaki, Japan · 21.2 kmM 4.6 · 50 km SE of Ishinomaki, Japan · 76.9 kmM 4.7 · 53 km ESE of Ishinomaki, Japan · 70.5 kmM 7.1 · 29 km ESE of Ishinomaki, Japan · 93.7 kmM 4.5 · 78 km ENE of Namie, Japan · 76.4 kmM 4.6 · 110 km ESE of Ishinomaki, Japan · 14.9 kmM 4.8 · 76 km E of Ishinomaki, Japan · 51.9 kmM 4.9 · 121 km E of Namie, Japan · 77.6 kmM 4.6 · 76 km E of Ishinomaki, Japan · 53.5 kmM 4.6 · 200 km SE of ?funato, Japan · 83.0 kmM 5.0 · 70 km E of Ishinomaki, Japan · 59.3 kmM 4.6 · 77 km E of Ishinomaki, Japan · 55.0 kmM 4.7 · 62 km ESE of ?funato, Japan · 99.7 kmM 4.7 · 53 km ESE of Ishinomaki, Japan · 69.4 kmM 5.0 · 121 km ESE of Ishinomaki, Japan · 23.5 kmM 5.1 · 117 km SE of Ishinomaki, Japan · 28.0 kmM 4.7 · 76 km E of Ishinomaki, Japan · 50.3 kmM 4.6 · 183 km E of Namie, Japan · 92.8 kmM 4.7 · 194 km ESE of ?funato, Japan · 91.9 kmM 5.0 · 101 km SE of Ishinomaki, Japan · 45.2 kmM 4.9 · 91 km SE of Ishinomaki, Japan · 47.0 kmM 4.8 · 130 km ESE of Namie, Japan · 97.6 kmM 4.7 · 68 km E of Ishinomaki, Japan · 60.0 kmM 4.5 · 60 km ENE of Namie, Japan · 92.7 kmM 4.8 · 188 km ESE of Ishinomaki, Japan · 66.5 kmM 4.5 · 85 km E of Ishinomaki, Japan · 43.6 kmM 4.6 · 92 km E of Ishinomaki, Japan · 48.3 kmM 4.5 · 78 km E of Ishinomaki, Japan · 56.8 kmM 4.6 · 83 km E of Ishinomaki, Japan · 53.7 kmM 4.9 · 199 km ESE of Ishinomaki, Japan · 78.0 kmM 4.8 · 191 km ESE of Ishinomaki, Japan · 69.0 kmM 4.5 · 56 km ESE of Ishinomaki, Japan · 66.4 km
M 4.6 · 122 km ESE of Ishinomaki, Japan100 km100 Recent earthquakes

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

Sequence context

This event belongs to a sequence detected by Quake Pulse.

Open sequence →

Nearby events · 100 km

M 4.546 km ESE of Ishinomaki, Japan76.9 km · 2011-05-16 21:14:05 UTCM 4.7146 km E of Namie, Japan70.2 km · 2011-05-16 07:17:09 UTCM 4.8155 km ESE of Ishinomaki, Japan38.5 km · 2011-05-15 13:48:37 UTCM 5.1145 km E of Namie, Japan85.4 km · 2011-05-15 12:14:20 UTCM 4.6218 km ESE of Ishinomaki, Japan95.3 km · 2011-05-13 10:16:58 UTCM 4.838 km ENE of Ishinomaki, Japan94.8 km · 2011-05-11 18:21:48 UTCM 4.5141 km ESE of Ishinomaki, Japan19.1 km · 2011-05-11 12:40:28 UTCM 5.2209 km ESE of Ishinomaki, Japan86.7 km · 2011-05-11 01:20:05 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 4.6 → M 4.6
Depth change+0.0 km
Last update2223856 min
2022-07-19 12:38:35 UTC2022-07-19 12:38:35 UTC

Explore related context

Related or nearby earthquakes

M 4.6 · 68 km ESE of Onagawa Chō, Japan47 km · 2026-08-04 14:00:26 UTCM 4.5 · 91 km E of Namie, Japan74 km · 2026-09-21 22:29:59 UTCM 4.5 · 27 km SE of Onagawa Chō, Japan86 km · 2026-04-12 13:00:45 UTCM 4.6 · 27 km E of Onagawa Chō, Japan86 km · 2026-04-04 10:36:47 UTC

Geographic context

CountryJapan →Nearby cityIshinomaki →Seismic sequenceM 4.6 →

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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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