M7.4 earthquake 128 km SSW of Tarauacá, Brazil

Friday, April 28, 1911, 09:52:14 UTC · 9.207°S, 71.267°W

A magnitude 7.4 earthquake struck 128 km SSW of Tarauacá, Brazil on Friday, April 28, 1911, 09:52:14 UTC, at a depth of 560.0 km (deep). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude: 7.4; Major · mw
Depth: 560 km; Deep
Felt reports: 0; Did You Feel It?
Est. shaking: —; No ShakeMap
PAGER alert: None; Not issued
Tsunami: No flag; USGS feed

Outlined circle: this earthquake

In context

How big was it, and why here?

Energy released

1.8 megatons of TNT

That is about 118 times the Hiroshima bomb. It released about 3,715 times the energy of a magnitude 5.0.

Tectonic setting

116 km

from the nearest mapped plate boundary, between the Sunda and Australian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.

Depth: deep

560 km

Deep earthquakes (over 300 km) happen deep inside subducting plates. They rarely cause damage, but can be felt faintly over very large distances.

Did You Feel It?

Where it was felt

No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.

I felt it — report to USGS ↗

USGS PAGER estimate

Who was exposed to shaking

USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.

After the main event

Aftershocks within 200 km

USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists no earlier M5.0+ earthquakes within 300 km.

Nearby trackers