M8.4 earthquake 6 km SSW of Atico, Peru

Saturday, June 23, 2001, 20:33:14 UTC · 16.265°S, 73.641°W

A magnitude 8.4 earthquake struck 6 km SSW of Atico, Peru on Saturday, June 23, 2001, 20:33:14 UTC, at a depth of 33.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude: 8.4; Great · mww
Depth: 33 km; Shallow
Felt reports: 0; Did You Feel It?
Est. shaking: VIII; Severe (ShakeMap)
PAGER alert: None; Not issued
Tsunami: No flag; USGS feed

Outlined circle: this earthquakeDashed circle: 400 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)

In context

How big was it, and why here?

Energy released

60 megatons of TNT

That is about 3,987 times the Hiroshima bomb. It released about 125,893 times the energy of a magnitude 5.0.

Tectonic setting

114 km

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

Depth: shallow

33 km

Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.

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 400 km

USGS lists 358 M2.5+ earthquakes within 400 km in the following 30 days; the largest was M7.6 on July 7, 2001. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 276 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 32 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 1,089 recorded deaths. The most severe:

1784M8.0
Arequipa,Camana,Moquegua,Tambo
13 May 1784 · 177 km away · intensity X
383 deathsSevere damage ($5–24M)tsunami
1821
Camana, Ocona, Caraveli
10 Jul 1821 · 74 km away · intensity VIII
162 deathsSevere damage ($5–24M)
1913M6.3
Amyaraes, Abancay, Casaya, Soraya
4 Nov 1913 · 243 km away · intensity X
150 deathsSevere damage ($5–24M)
2001M8.4
Arequipa, Moquegua, Tacna, Ayacucho
23 Jun 2001 · 0 km away · intensity VIII
103 deaths$200 million damagetsunami
1991M4.7
Maca, Chivay, Yanque
23 Jul 1991 · 230 km away · intensity V
92 deathsModerate damage ($1–5M)
1960M7.8
Arequipa,Chuquibamba,Caraveli,Cotahuasi
13 Jan 1960 · 111 km away · intensity X
63 deathsSevere damage ($5–24M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers