M5.3 earthquake in Kepulauan Babar, Indonesia

Sunday, October 25, 1987, 22:52:48 UTC · 7.061°S, 129.865°E

A magnitude 5.3 earthquake struck in Kepulauan Babar, Indonesia on Sunday, October 25, 1987, 22:52:48 UTC, at a depth of 94.0 km (intermediate). It is the strongest earthquake within 300 km since an M5.4 on October 21, 1987.

Magnitude: 5.3; Moderate · mw
Depth: 94 km; Intermediate
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: 75 km aftershock search area

In context

How big was it, and why here?

Energy released

1 kilotons of TNT

That is about 1/11 of the Hiroshima bomb. It released about 3 times the energy of a magnitude 5.0.

Tectonic setting

55 km

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

Depth: intermediate

94 km

Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.

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 75 km

USGS lists 7 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M4.9 on November 10, 1987. 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 588 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 16 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 67 recorded deaths. The most severe:

1852M8.3
Maluku: Bandanaira
25 Nov 1852 · 202 km away · intensity IX
60 deathsSevere damage ($5–24M)tsunami
1763
Bandaneira
12 Sep 1763 · 119 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
1710
Bandaneira
6 Mar 1710 · 281 km away · intensity IX
Severe damage ($5–24M)tsunami
1938M8.6
New Guinea
1 Feb 1938 · 296 km away · intensity VI
Moderate damage ($1–5M)tsunami
1975M5.9
Maluku: Bandanaira
15 Jan 1975 · 230 km away · intensity VII
Moderate damage ($1–5M)tsunami
1890
Bandaneira
23 Nov 1890 · 285 km away · intensity VII
Moderate damage ($1–5M)

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

Nearby trackers