QuakeScout
Magnitude4.0

Reviewed by USGSIndonesia27y ago

M4.0 earthquake 92 km SW of Labuan, Indonesia

Saturday, December 25, 1999, 19:11:49 UTC · 7.061°S, 105.353°E

A magnitude 4.0 earthquake struck 92 km SW of Labuan, Indonesia on Saturday, December 25, 1999, 19:11:49 UTC, at a depth of 33.0 km (shallow).

Magnitude
4.0
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 earthquakeDashed circle: 50 km aftershock search area

In context

How big was it, and why here?

Energy released

15 tons of TNT

That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.

Tectonic setting

149 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

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 lists 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M5.6 on January 8, 2000. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M4M51h6h1d3d7d14d30dMainshock M4.0
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 5.645 km SSW of Labuan, Indonesia27y ago · 48 km NE of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 368 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 · 224 km N of this epicenter
  2. 7.030 km WNW of Labuan, IndonesiaApril 1, 1943 · 88 km N of this epicenter
  3. 6.966 km WSW of Kotabumi, IndonesiaFebruary 15, 1994 · 260 km NW of this epicenter
  4. 6.850 km WSW of Labuan, IndonesiaJuly 3, 1954 · 50 km N of this epicenter
  5. 6.679 km WSW of Labuan, IndonesiaAugust 13, 1913 · 38 km NW of this epicenter
  6. 6.559 km SSW of Labuan, IndonesiaDecember 21, 1999 · 33 km NE of this epicenter
  7. 6.5187 km S of Pagar Alam, IndonesiaFebruary 6, 1992 · 285 km NW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 16 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 213 recorded deaths. The most severe:

  1. 1994M6.9

    Southern Sumatera, Liwa, Lampung

    15 Feb 1994 · 260 km away

    207 deaths$170 million damage

  2. 1999M6.5

    Pandeglang, W Jawa, Se Sumatera

    21 Dec 1999 · 33 km away

    5 deaths$4 million damage

  3. 1975M5.6

    Java

    9 Feb 1975 · 154 km away · intensity VIII

    1 deathModerate damage ($1–5M)

  4. 1834

    Java: Bogor, Cinajur

    10 Oct 1834 · 186 km away · intensity IX

    Severe damage ($5–24M)

  5. 1933M5.8

    S Sumatera

    25 Jun 1933 · 247 km away · intensity IX

    Moderate damage ($1–5M)

  6. 1982M5.5

    Java, Sukabumi

    10 Feb 1982 · 176 km away

    $4 million damage

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

Nearby trackers

Closest city pages