QuakeScout
Magnitude7.0

Reviewed by USGSIndonesia84y ago

M7.0 earthquake 30 km WNW of Labuan, Indonesia

Thursday, April 1, 1943, 14:18:17 UTC · 6.301°S, 105.564°E

A magnitude 7.0 earthquake struck 30 km WNW of Labuan, Indonesia on Thursday, April 1, 1943, 14:18:17 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M7.5 on June 24, 1933.

Magnitude
7.0
Strong · mw
Depth
35 km
Shallow
Felt reports
0
Did You Feel It?
Est. shaking
VII
Very strong (ShakeMap)
PAGER alert
None
Not issued
Tsunami
No flag
USGS feed

Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)

In context

How big was it, and why here?

Energy released

445 kilotons of TNT

That is about 30 times the Hiroshima bomb. It released about 933 times the energy of a magnitude 5.0.

Tectonic setting

234 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: shallow

35 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 100 km

USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 26 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.548 km SW of Kotabumi, IndonesiaJune 24, 1933 · 162 km NW of this epicenter
  2. 6.679 km WSW of Labuan, IndonesiaAugust 13, 1913 · 63 km SW of this epicenter
  3. 6.5271 km S of Pagar Alam, IndonesiaMarch 3, 1921 · 285 km W of this epicenter
  4. 6.585 km SW of Labuan, IndonesiaMay 12, 1923 · 75 km SW of this epicenter
  5. 6.4200 km SW of Bandar Lampung, IndonesiaOctober 4, 1907 · 176 km W of this epicenter
  6. 6.385 km SSW of Kotabumi, IndonesiaApril 2, 1919 · 149 km NW of this epicenter
  7. 6.3157 km WSW of Pelabuhanratu, IndonesiaJanuary 18, 1931 · 163 km S of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 10 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:

  1. 1834

    Java: Bogor, Cinajur

    10 Oct 1834 · 165 km away · intensity IX

    Severe damage ($5–24M)

  2. 1933M5.8

    S Sumatera

    25 Jun 1933 · 186 km away · intensity IX

    Moderate damage ($1–5M)

  3. 1900

    Java: Sukabumi

    14 Jan 1900 · 165 km away · intensity VII

    Moderate damage ($1–5M)

  4. 1852M6.5

    Java: Djakarta; Sumatra: Telukbetung

    9 Jan 1852 · 23 km away · intensity VIII

    Limited damage (under $1M)tsunami

  5. 1903M8.1

    S Of Java

    27 Feb 1903 · 195 km away

  6. 1757M7.5

    Jakarta

    24 Aug 1757 · 162 km away

    tsunami

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

Nearby trackers

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