QuakeScout
Magnitude4.3

Reviewed by USGSPeru25y ago

M4.3 earthquake 105 km WSW of Pacocha, Peru

Monday, July 30, 2001, 12:26:49 UTC · 18.047°S, 72.251°W

A magnitude 4.3 earthquake struck 105 km WSW of Pacocha, Peru on Monday, July 30, 2001, 12:26:49 UTC, at a depth of 33.0 km (shallow).

Magnitude
4.3
Light · mb
Depth
33 km
Shallow
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

43 tons of TNT

That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.

Tectonic setting

53 km

from the nearest mapped plate boundary, between the Nazca and Altiplano plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

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 50 km

USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 302 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 8.46 km SSW of Atico, PeruJune 23, 2001 · 247 km NW of this epicenter
  2. 7.737 km SSW of Atico, PeruAugust 6, 1913 · 231 km NW of this epicenter
  3. 7.651 km SW of Punta de Bombón, PeruJuly 7, 2001 · 59 km N of this epicenter
  4. 7.235 km N of El Cardo, PeruOctober 11, 1922 · 202 km N of this epicenter
  5. 7.2Near the coast of Tarapaca, ChileOctober 4, 1940 · 288 km SE of this epicenter
  6. 7.212 km NNE of Cono Norte, PeruFebruary 26, 1914 · 217 km N of this epicenter
  7. 7.268 km SSE of Arica, ChileAugust 8, 1987 · 262 km SE of this epicenter
  8. 7.130 km SW of Islay (Matarani), PeruApril 12, 1988 · 95 km N of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 47 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 26,559 recorded deaths. The most severe:

  1. 1868M8.5

    Arica

    13 Aug 1868 · 146 km away · intensity XI

    25,000 deaths$300 million damagetsunami

  2. 1833M7.7

    Peru: Tacna; Chile: Arica

    18 Sep 1833 · 133 km away · intensity VIII

    700 deathsSevere damage ($5–24M)tsunami

  3. 1784M8.0

    Arequipa,Camana,Moquegua,Tambo

    13 May 1784 · 174 km away · intensity X

    383 deathsSevere damage ($5–24M)tsunami

  4. 1821

    Camana, Ocona, Caraveli

    10 Jul 1821 · 229 km away · intensity VIII

    162 deathsSevere damage ($5–24M)

  5. 2001M8.4

    Arequipa, Moquegua, Tacna, Ayacucho

    23 Jun 2001 · 247 km away · intensity VIII

    103 deaths$200 million damagetsunami

  6. 1991M4.7

    Maca, Chivay, Yanque

    23 Jul 1991 · 273 km away · intensity V

    92 deathsModerate damage ($1–5M)

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

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