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Updated 2022-07-19 08:04:51 UTC

M 7.7 — 272 km ESE of Kamaishi, Japan

Magnitude 7.7, depth 18.6 km, 2011-03-11 06:25:50 UTC.

MagnitudeM 7.7
Depth18.6 km
Felt reports28
Statusreviewed
TsunamiNo

Japan → · Kamaishi →

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 7.7 at 18.6 km depth.
  • 28 felt report(s) are associated with the USGS record.
Counts describe detected earthquakes and are not a forecast or hazard assessment.
Quake Pulse

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#63
Magnitude rank in country#4
M4.5+ within 250 km, ±15 days1,170
Sequence context1686 events →
Remarkable

Why this event stands out

high magnitude

65/100
Quake Pulse

Impact and context

Descriptive indicators available for this event and its surroundings.

62/100High context
Felt reports28
Max felt intensity (CDI)6.8
Instrumental intensity (MMI)4.1
PAGER alertNot available
Tsunami indicator—
USGS significance931
Depth contextShallow
Nearby major city—
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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 7.7 · 272 km ESE of Kamaishi, Japan · 100 kmInteractive 3D view of earthquakes within 100 km of M 7.7 · 272 km ESE of Kamaishi, Japan.M 7.7 · 272 km ESE of Kamaishi, JapanM 4.6 · 214 km ESE of Ishinomaki, Japan · 98.1 kmM 4.7 · 199 km ESE of Kamaishi, Japan · 72.9 kmM 4.6 · 236 km SE of ?funato, Japan · 58.5 kmM 4.6 · 229 km SE of ?funato, Japan · 60.0 kmM 4.6 · 233 km ESE of ?funato, Japan · 56.0 kmM 4.7 · 214 km ESE of Ishinomaki, Japan · 88.3 kmM 4.6 · 282 km ESE of Ishinomaki, Japan · 63.3 kmM 4.8 · 222 km ESE of Kamaishi, Japan · 66.7 kmM 4.6 · off the east coast of Honshu, Japan · 53.6 kmM 4.6 · 235 km ESE of Kamaishi, Japan · 38.3 kmM 4.8 · off the east coast of Honshu, Japan · 77.8 kmM 4.7 · 295 km ESE of ?funato, Japan · 45.3 kmM 4.5 · 253 km ESE of Yamada, Japan · 88.1 kmM 4.5 · 280 km ESE of ?funato, Japan · 40.6 kmM 4.7 · 272 km ESE of ?funato, Japan · 32.4 kmM 4.6 · 200 km SE of ?funato, Japan · 91.4 kmM 4.5 · 286 km ESE of ?funato, Japan · 34.9 kmM 4.5 · 276 km ESE of Kamaishi, Japan · 24.6 kmM 4.6 · 256 km SE of ?funato, Japan · 54.8 kmM 4.7 · off the east coast of Honshu, Japan · 65.1 kmM 4.7 · 194 km ESE of ?funato, Japan · 84.5 kmM 4.5 · 269 km SE of ?funato, Japan · 51.2 kmM 4.5 · 297 km E of Namie, Japan · 95.5 kmM 4.5 · 269 km ESE of Ishinomaki, Japan · 66.3 kmM 4.9 · 204 km SE of ?funato, Japan · 90.9 kmM 4.6 · 284 km ESE of Kamaishi, Japan · 11.3 kmM 4.6 · 260 km ESE of Kamaishi, Japan · 27.6 kmM 4.6 · 216 km ESE of Ishinomaki, Japan · 86.0 kmM 4.5 · 231 km ESE of Kamaishi, Japan · 43.5 kmM 4.5 · 289 km ESE of Kamaishi, Japan · 16.4 kmM 4.7 · 267 km ESE of Kamaishi, Japan · 58.1 kmM 4.5 · 200 km ESE of ?funato, Japan · 77.1 kmM 4.9 · 280 km ESE of Kamaishi, Japan · 12.9 kmM 4.7 · 280 km ESE of Kamaishi, Japan · 8.1 kmM 4.6 · 245 km ESE of Kamaishi, Japan · 28.9 kmM 4.5 · 244 km ESE of ?funato, Japan · 49.1 kmM 4.8 · 230 km ESE of ?funato, Japan · 55.9 kmM 4.5 · 251 km ESE of Kamaishi, Japan · 21.7 kmM 5.1 · 236 km ESE of Ishinomaki, Japan · 76.6 kmM 5.3 · 238 km ESE of Ishinomaki, Japan · 71.4 kmM 4.7 · 231 km ESE of Kamaishi, Japan · 41.7 kmM 4.7 · 251 km ESE of Ishinomaki, Japan · 85.5 kmM 4.8 · 203 km SE of ?funato, Japan · 85.4 kmM 4.6 · 219 km SE of ?funato, Japan · 71.4 kmM 4.5 · 209 km SE of ?funato, Japan · 78.7 kmM 5.0 · 203 km SE of ?funato, Japan · 85.0 kmM 4.6 · 215 km SE of ?funato, Japan · 74.9 kmM 5.4 · 202 km SE of ?funato, Japan · 87.7 kmM 4.7 · 284 km E of Namie, Japan · 96.4 kmM 4.7 · 242 km SE of ?funato, Japan · 54.2 kmM 4.6 · off the east coast of Honshu, Japan · 50.4 kmM 4.5 · 251 km ESE of Kamaishi, Japan · 23.1 kmM 4.5 · 178 km ESE of ?funato, Japan · 97.6 kmM 4.5 · 276 km SE of ?funato, Japan · 42.8 kmM 4.9 · 254 km ESE of ?funato, Japan · 32.3 kmM 4.5 · 264 km ESE of Kamaishi, Japan · 48.6 kmM 4.5 · 226 km ESE of Ishinomaki, Japan · 87.0 kmM 4.7 · 234 km ESE of Ishinomaki, Japan · 82.5 kmM 4.7 · 227 km ESE of Ishinomaki, Japan · 81.3 kmM 4.6 · 236 km ESE of Ishinomaki, Japan · 84.8 kmM 4.5 · 238 km ESE of Ishinomaki, Japan · 83.3 kmM 5.1 · 284 km ESE of Kamaishi, Japan · 12.7 kmM 4.5 · 213 km ESE of Kamaishi, Japan · 68.2 kmM 4.6 · 206 km ESE of Kamaishi, Japan · 74.6 kmM 4.6 · 298 km ESE of ?funato, Japan · 41.5 kmM 4.5 · off the east coast of Honshu, Japan · 86.6 kmM 4.5 · 276 km ESE of Kamaishi, Japan · 32.1 kmM 4.6 · 211 km ESE of Kamaishi, Japan · 80.5 kmM 4.8 · 287 km SE of ?funato, Japan · 57.1 kmM 4.5 · 279 km ESE of Kamaishi, Japan · 49.3 kmM 4.8 · 266 km SE of ?funato, Japan · 48.2 kmM 4.5 · 256 km ESE of Ishinomaki, Japan · 76.6 kmM 4.9 · 195 km ESE of Kamaishi, Japan · 82.3 kmM 4.5 · off the east coast of Honshu, Japan · 82.4 kmM 4.6 · 274 km SE of ?funato, Japan · 49.4 kmM 4.5 · 267 km ESE of Kamaishi, Japan · 33.6 kmM 4.9 · 256 km ESE of Kamaishi, Japan · 40.6 kmM 4.6 · 231 km ESE of Ishinomaki, Japan · 91.8 kmM 4.8 · 271 km ESE of Ishinomaki, Japan · 60.6 kmM 4.8 · 218 km ESE of Kamaishi, Japan · 54.4 kmM 5.0 · off the east coast of Honshu, Japan · 73.5 kmM 4.7 · 276 km ESE of Kamaishi, Japan · 42.0 kmM 4.7 · 254 km ESE of Ishinomaki, Japan · 81.0 kmM 4.5 · 224 km ESE of Ishinomaki, Japan · 88.0 kmM 4.7 · off the east coast of Honshu, Japan · 89.8 kmM 4.7 · 254 km SE of ?funato, Japan · 58.6 kmM 4.6 · 273 km ESE of Kamaishi, Japan · 25.0 kmM 4.7 · 206 km ESE of Ishinomaki, Japan · 95.6 kmM 4.5 · 250 km ESE of Ishinomaki, Japan · 67.9 kmM 4.6 · 231 km ESE of ?funato, Japan · 49.5 kmM 4.8 · 286 km SE of ?funato, Japan · 54.4 kmM 4.7 · 197 km ESE of Kamaishi, Japan · 82.5 kmM 4.7 · 271 km ESE of Kamaishi, Japan · 14.9 kmM 4.8 · 233 km ESE of Ishinomaki, Japan · 86.8 kmM 4.5 · 264 km SE of ?funato, Japan · 53.5 kmM 4.9 · 240 km ESE of Kamaishi, Japan · 65.2 kmM 4.9 · 188 km ESE of Kamaishi, Japan · 91.8 kmM 4.8 · 202 km ESE of Kamaishi, Japan · 79.9 kmM 5.2 · 190 km ESE of Kamaishi, Japan · 88.9 kmM 4.5 · 263 km ESE of ?funato, Japan · 30.0 km
M 7.7 · 272 km ESE of Kamaishi, 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 4.6214 km ESE of Ishinomaki, Japan98.1 km · 2011-04-09 18:51:15 UTCM 4.7199 km ESE of Kamaishi, Japan72.9 km · 2011-04-08 19:13:29 UTCM 4.6236 km SE of ?funato, Japan58.5 km · 2011-04-08 12:10:54 UTCM 4.6229 km SE of ?funato, Japan60.0 km · 2011-04-08 10:04:15 UTCM 4.6233 km ESE of ?funato, Japan56.0 km · 2011-04-08 07:07:39 UTCM 4.7214 km ESE of Ishinomaki, Japan88.3 km · 2011-04-08 05:09:06 UTCM 4.6282 km ESE of Ishinomaki, Japan63.3 km · 2011-04-07 19:15:42 UTCM 4.8222 km ESE of Kamaishi, Japan66.7 km · 2011-04-07 11:52:33 UTC
Quake Pulse

USGS data evolution

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

Revisions1
Magnitude change+0.0M 7.7 → M 7.7
Depth change+0.0 km
Last update2222849 min
2022-07-19 08:04:51 UTC2022-07-19 08:04:51 UTC

Explore related context

Related or nearby earthquakes

M 4.5 · 228 km ESE of Kamaishi, Japan44 km · 2026-02-06 17:56:52 UTCM 5.6 · 209 km ESE of Ōfunato, Japan67 km · 2026-08-26 19:21:42 UTCM 4.5 · 295 km ESE of Onagawa Chō, Japan79 km · 2026-05-10 03:03:39 UTCM 4.7 · 240 km ESE of Yamada, Japan85 km · 2026-06-17 14:28:50 UTC

Geographic context

CountryJapan →Nearby cityKamaishi →Seismic sequenceM 7.7 →

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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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