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Updated 2025-07-24 14:59:06 UTC

M 8.2 — 2012 Wharton Basin Aftershock

Magnitude 8.2, depth 25.1 km, 2012-04-11 10:43:10 UTC.

MagnitudeM 8.2
Depth25.1 km
Felt reports196
Statusreviewed
TsunamiNo
Quake Pulse

What to know

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

  • Magnitude M 8.2 at 25.1 km depth.
  • 196 felt report(s) are associated with the USGS record.
  • The available PAGER level is GREEN.
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#12
M4.5+ within 250 km, ±15 days141
Sequence context209 events →
Remarkable

Why this event stands out

high magnitude · high USGS significance

77/100
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Impact and context

Descriptive indicators available for this event and its surroundings.

70/100High context
Felt reports196
Max felt intensity (CDI)9.1
Instrumental intensity (MMI)5.6
PAGER alertGREEN
Tsunami indicator—
USGS significance1,213
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 8.2 · 2012 Wharton Basin Aftershock · 100 kmInteractive 3D view of earthquakes within 100 km of M 8.2 · 2012 Wharton Basin Aftershock.M 8.2 · 2012 Wharton Basin AftershockM 4.5 · off the west coast of northern Sumatra · 12.0 kmM 5.1 · North Indian Ocean · 91.0 kmM 4.7 · North Indian Ocean · 73.7 kmM 4.5 · North Indian Ocean · 96.6 kmM 4.5 · North Indian Ocean · 74.7 kmM 4.7 · off the west coast of northern Sumatra · 63.3 kmM 4.6 · off the west coast of northern Sumatra · 54.5 kmM 5.2 · off the west coast of northern Sumatra · 74.1 kmM 5.3 · off the west coast of northern Sumatra · 5.1 kmM 4.6 · off the west coast of northern Sumatra · 72.6 kmM 4.9 · North Indian Ocean · 81.3 kmM 5.4 · off the west coast of northern Sumatra · 71.6 kmM 4.5 · off the west coast of northern Sumatra · 46.6 kmM 4.5 · off the west coast of northern Sumatra · 45.7 kmM 4.8 · North Indian Ocean · 70.1 kmM 4.6 · North Indian Ocean · 81.4 kmM 4.8 · North Indian Ocean · 77.1 kmM 4.8 · off the west coast of northern Sumatra · 53.6 kmM 4.9 · off the west coast of northern Sumatra · 35.3 kmM 4.8 · off the west coast of northern Sumatra · 52.4 kmM 4.7 · off the west coast of northern Sumatra · 56.9 kmM 4.8 · North Indian Ocean · 70.4 kmM 5.0 · North Indian Ocean · 92.6 kmM 5.0 · North Indian Ocean · 96.4 kmM 4.9 · North Indian Ocean · 67.0 kmM 5.1 · off the west coast of northern Sumatra · 69.9 kmM 5.1 · off the west coast of northern Sumatra · 20.7 kmM 4.5 · off the west coast of northern Sumatra · 46.3 kmM 4.5 · off the west coast of northern Sumatra · 75.4 kmM 4.8 · off the west coast of northern Sumatra · 50.6 kmM 5.5 · off the west coast of northern Sumatra · 59.7 kmM 4.6 · off the west coast of northern Sumatra · 59.6 kmM 4.7 · North Indian Ocean · 68.3 kmM 4.7 · North Indian Ocean · 62.3 kmM 4.7 · off the west coast of northern Sumatra · 43.0 kmM 4.9 · North Indian Ocean · 99.9 kmM 4.8 · off the west coast of northern Sumatra · 26.1 kmM 4.8 · off the west coast of northern Sumatra · 14.2 kmM 5.0 · off the west coast of northern Sumatra · 54.6 kmM 5.3 · North Indian Ocean · 81.8 kmM 5.2 · off the west coast of northern Sumatra · 51.9 kmM 4.5 · off the west coast of northern Sumatra · 13.3 kmM 4.6 · North Indian Ocean · 79.2 kmM 5.1 · off the west coast of northern Sumatra · 63.4 kmM 5.3 · North Indian Ocean · 64.3 kmM 4.7 · off the west coast of northern Sumatra · 72.1 kmM 4.6 · off the west coast of northern Sumatra · 26.2 kmM 5.4 · off the west coast of northern Sumatra · 44.2 kmM 5.1 · off the west coast of northern Sumatra · 22.1 kmM 4.8 · off the west coast of northern Sumatra · 3.7 kmM 5.4 · North Indian Ocean · 77.4 kmM 4.9 · North Indian Ocean · 69.8 kmM 4.9 · North Indian Ocean · 72.9 kmM 4.6 · off the west coast of northern Sumatra · 47.1 kmM 4.8 · North Indian Ocean · 67.6 kmM 6.0 · North Indian Ocean · 95.3 kmM 4.5 · North Indian Ocean · 75.9 kmM 4.9 · off the west coast of northern Sumatra · 77.1 kmM 5.2 · North Indian Ocean · 88.9 kmM 5.0 · North Indian Ocean · 61.4 kmM 5.8 · North Indian Ocean · 95.1 km
M 8.2 · 2012 Wharton Basin Aftershock100 km61 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 4.5off the west coast of northern Sumatra12.0 km · 2012-04-27 08:16:55 UTCM 5.1North Indian Ocean91.0 km · 2012-04-24 19:43:53 UTCM 4.7North Indian Ocean73.7 km · 2012-04-22 13:50:40 UTCM 4.5North Indian Ocean96.6 km · 2012-04-19 18:07:08 UTCM 4.5North Indian Ocean74.7 km · 2012-04-19 06:52:09 UTCM 4.7off the west coast of northern Sumatra63.3 km · 2012-04-18 16:08:23 UTCM 4.6off the west coast of northern Sumatra54.5 km · 2012-04-17 03:57:31 UTCM 5.2off the west coast of northern Sumatra74.1 km · 2012-04-16 16:05:53 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 8.2 → M 8.2
Depth change+0.0 km
Last update636996 min
2025-07-24 14:59:06 UTC2025-07-24 14:59:06 UTC

Explore related context

Related or nearby earthquakes

M 4.8 · off the west coast of northern Sumatra37 km · 2025-10-06 10:11:57 UTCM 5.5 · off the west coast of northern Sumatra73 km · 2023-09-27 17:47:21 UTCM 5.7 · off the west coast of northern Sumatra197 km · 2023-12-30 05:19:28 UTCM 4.5 · 274 km SW of Sinabang, Indonesia214 km · 2024-11-08 16:30:57 UTC

Geographic context

Seismic sequenceM 8.2 →

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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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