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Updated 2014-11-07 01:44:15 UTC

M 4.9 — 199 km ESE of Ishinomaki, Japan

Magnitude 4.9, depth 22.3 km, 2011-03-20 17:37:51 UTC.

MagnitudeM 4.9
Depth22.3 km
Felt reports—
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 →
Quake Pulse

What to know

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

  • Magnitude M 4.9 at 22.3 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#48,164
Magnitude rank in country#3,635
M4.5+ within 250 km, ±15 days1,685
Sequence context1168 events →
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Impact and context

Descriptive indicators available for this event and its surroundings.

13/100Limited context
Felt reports—
Max felt intensity (CDI)—
Instrumental intensity (MMI)—
PAGER alertNot available
Tsunami indicator—
USGS significance369
Depth contextShallow
Nearby major cityTokyo408 km · 14,000,000

Nearby major city

Tokyo408 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 4.9 · 199 km ESE of Ishinomaki, Japan · 100 kmInteractive 3D view of earthquakes within 100 km of M 4.9 · 199 km ESE of Ishinomaki, Japan.M 4.9 · 199 km ESE of Ishinomaki, JapanM 5.0 · 223 km E of Namie, Japan · 66.9 kmM 4.6 · 233 km E of Namie, Japan · 72.7 kmM 4.6 · 122 km ESE of Ishinomaki, Japan · 76.9 kmM 4.7 · 227 km ESE of Kamaishi, Japan · 68.9 kmM 4.6 · 238 km ESE of Ishinomaki, Japan · 38.6 kmM 4.8 · 242 km ESE of ?funato, Japan · 61.2 kmM 4.6 · 162 km ESE of Ishinomaki, Japan · 41.7 kmM 4.5 · 186 km E of Namie, Japan · 43.5 kmM 5.4 · 288 km SE of ?funato, Japan · 92.6 kmM 4.5 · 265 km ESE of Namie, Japan · 95.7 kmM 4.5 · 137 km E of Namie, Japan · 80.1 kmM 4.5 · 101 km ESE of Ishinomaki, Japan · 98.4 kmM 4.7 · 132 km SE of Ishinomaki, Japan · 78.1 kmM 4.7 · 224 km ESE of Namie, Japan · 94.7 kmM 4.6 · 214 km ESE of Ishinomaki, Japan · 15.2 kmM 4.7 · 139 km SE of ?funato, Japan · 67.3 kmM 4.7 · 199 km ESE of Kamaishi, Japan · 76.8 kmM 4.6 · 236 km SE of ?funato, Japan · 47.6 kmM 4.6 · 229 km SE of ?funato, Japan · 46.2 kmM 4.6 · 233 km ESE of ?funato, Japan · 49.9 kmM 4.7 · 214 km ESE of Ishinomaki, Japan · 17.7 kmM 4.6 · 227 km E of Namie, Japan · 73.7 kmM 4.6 · 282 km ESE of Ishinomaki, Japan · 83.1 kmM 4.7 · 101 km ESE of Ishinomaki, Japan · 98.1 kmM 4.6 · off the east coast of Honshu, Japan · 69.9 kmM 4.6 · 110 km ESE of Ishinomaki, Japan · 90.4 kmM 4.6 · 245 km E of Namie, Japan · 54.1 kmM 4.6 · 235 km ESE of Kamaishi, Japan · 77.6 kmM 4.5 · 280 km ESE of ?funato, Japan · 88.2 kmM 4.7 · 272 km ESE of ?funato, Japan · 84.6 kmM 4.6 · 200 km SE of ?funato, Japan · 24.2 kmM 4.5 · 286 km ESE of ?funato, Japan · 97.1 kmM 4.6 · 256 km SE of ?funato, Japan · 60.3 kmM 5.0 · 121 km ESE of Ishinomaki, Japan · 84.5 kmM 5.1 · 117 km SE of Ishinomaki, Japan · 90.6 kmM 4.6 · 183 km E of Namie, Japan · 68.3 kmM 4.7 · 194 km ESE of ?funato, Japan · 46.4 kmM 4.6 · 227 km E of Namie, Japan · 46.1 kmM 4.8 · 188 km ESE of Ishinomaki, Japan · 16.1 kmM 4.7 · 285 km E of Namie, Japan · 99.8 kmM 4.8 · 221 km ESE of Namie, Japan · 91.1 kmM 4.8 · 225 km ESE of Namie, Japan · 90.5 kmM 4.9 · 199 km ESE of Ishinomaki, Japan · 20.0 kmM 4.8 · 191 km ESE of Ishinomaki, Japan · 8.5 kmM 4.5 · 269 km SE of ?funato, Japan · 72.9 kmM 4.6 · 102 km ESE of Ishinomaki, Japan · 97.0 kmM 4.9 · 270 km E of Namie, Japan · 85.7 kmM 4.6 · 208 km ESE of Ishinomaki, Japan · 10.2 kmM 4.5 · 269 km ESE of Ishinomaki, Japan · 69.2 kmM 4.9 · 204 km SE of ?funato, Japan · 20.6 kmM 4.9 · 138 km SE of Ishinomaki, Japan · 75.1 kmM 4.8 · 138 km E of Namie, Japan · 95.9 kmM 4.6 · 138 km SE of Ishinomaki, Japan · 72.8 kmM 4.7 · 273 km E of Namie, Japan · 85.9 kmM 4.7 · 107 km ESE of Ishinomaki, Japan · 93.1 kmM 4.5 · 134 km SE of ?funato, Japan · 73.0 kmM 4.6 · 116 km SE of ?funato, Japan · 90.2 kmM 4.5 · 140 km E of Namie, Japan · 93.6 kmM 4.6 · 141 km E of Namie, Japan · 86.8 kmM 4.6 · 216 km ESE of Ishinomaki, Japan · 20.0 kmM 4.5 · 231 km ESE of Kamaishi, Japan · 72.2 kmM 4.5 · 200 km ESE of ?funato, Japan · 50.4 kmM 4.5 · 251 km E of Namie, Japan · 77.0 kmM 4.8 · 273 km E of Namie, Japan · 93.0 kmM 4.8 · 194 km ESE of Ishinomaki, Japan · 8.0 kmM 4.7 · 195 km ESE of Ishinomaki, Japan · 7.1 kmM 4.6 · 245 km ESE of Kamaishi, Japan · 81.8 kmM 4.5 · 274 km E of Namie, Japan · 93.0 kmM 4.9 · 208 km ESE of Ishinomaki, Japan · 21.8 kmM 4.7 · 118 km E of Namie, Japan · 98.8 kmM 4.7 · 126 km E of Namie, Japan · 90.9 kmM 4.7 · 193 km ESE of Namie, Japan · 85.1 kmM 5.1 · 211 km ESE of Namie, Japan · 92.8 kmM 4.7 · 146 km E of Namie, Japan · 76.4 kmM 4.9 · 216 km ESE of Namie, Japan · 94.8 kmM 4.7 · 134 km E of Namie, Japan · 97.7 kmM 4.6 · 226 km ESE of Namie, Japan · 97.1 kmM 4.6 · 159 km ESE of Ishinomaki, Japan · 53.2 kmM 4.5 · 244 km ESE of ?funato, Japan · 57.5 kmM 4.8 · 230 km ESE of ?funato, Japan · 50.6 kmM 4.5 · 171 km ESE of Ishinomaki, Japan · 36.2 kmM 4.5 · 251 km ESE of Kamaishi, Japan · 96.5 kmM 5.1 · 236 km ESE of Ishinomaki, Japan · 36.5 kmM 5.3 · 238 km ESE of Ishinomaki, Japan · 39.8 kmM 4.7 · 231 km ESE of Kamaishi, Japan · 79.0 kmM 4.8 · 153 km ESE of Kamaishi, Japan · 85.8 kmM 4.7 · 251 km ESE of Ishinomaki, Japan · 53.4 kmM 4.8 · 164 km ESE of Ishinomaki, Japan · 35.5 kmM 4.8 · 203 km SE of ?funato, Japan · 29.3 kmM 4.8 · 201 km ESE of Ishinomaki, Japan · 15.7 kmM 4.6 · 255 km ESE of Namie, Japan · 97.9 kmM 4.6 · 219 km SE of ?funato, Japan · 36.0 kmM 4.5 · 209 km SE of ?funato, Japan · 32.6 kmM 5.0 · 203 km SE of ?funato, Japan · 29.5 kmM 4.6 · 215 km SE of ?funato, Japan · 33.8 kmM 5.4 · 202 km SE of ?funato, Japan · 26.8 kmM 4.5 · 268 km E of Namie, Japan · 93.1 kmM 4.7 · 284 km E of Namie, Japan · 90.4 kmM 4.7 · 152 km E of Namie, Japan · 66.3 kmM 4.7 · 242 km SE of ?funato, Japan · 52.8 km
M 4.9 · 199 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 5.0223 km E of Namie, Japan66.9 km · 2011-04-19 04:04:30 UTCM 4.6233 km E of Namie, Japan72.7 km · 2011-04-18 03:53:40 UTCM 4.6122 km ESE of Ishinomaki, Japan76.9 km · 2011-04-17 17:34:20 UTCM 4.7227 km ESE of Kamaishi, Japan68.9 km · 2011-04-17 06:17:04 UTCM 4.6238 km ESE of Ishinomaki, Japan38.6 km · 2011-04-17 01:02:27 UTCM 4.8242 km ESE of ?funato, Japan61.2 km · 2011-04-13 17:34:06 UTCM 4.6162 km ESE of Ishinomaki, Japan41.7 km · 2011-04-13 12:05:36 UTCM 4.5186 km E of Namie, Japan43.5 km · 2011-04-12 18:02:28 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 4.9 → M 4.9
Depth change+0.0 km
Last update6271377 min
2014-11-07 01:44:15 UTC2014-11-07 01:44:15 UTC

Explore related context

Related or nearby earthquakes

M 5.6 · 209 km ESE of Ōfunato, Japan57 km · 2026-08-26 19:21:42 UTCM 4.5 · 295 km ESE of Onagawa Chō, Japan107 km · 2026-05-10 03:03:39 UTCM 4.5 · 256 km ESE of Tomioka, Japan108 km · 2026-05-12 05:33:00 UTCM 4.6 · 68 km ESE of Onagawa Chō, Japan121 km · 2026-08-04 14:00:26 UTC

Geographic context

CountryJapan →Nearby cityIshinomaki →Seismic sequenceM 4.9 →

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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.

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