M5.2 earthquake 187 km SSE of Lata, Solomon Islands

Saturday, October 31, 2009, 13:03:21 UTC · 12.264°S, 166.523°E

A magnitude 5.2 earthquake struck 187 km SSE of Lata, Solomon Islands on Saturday, October 31, 2009, 13:03:21 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M5.3 on October 27, 2009.

Magnitude: 5.2; Moderate · mb
Depth: 35 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: 75 km aftershock search area

In context

How big was it, and why here?

Energy released

951 tons of TNT

That is about 1/16 of the Hiroshima bomb. It released about 2 times the energy of a magnitude 5.0.

Tectonic setting

79 km

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

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 75 km

USGS lists 13 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M5.7 on November 23, 2009. 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 1,485 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 24 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:

1973M7.5
Espiritu Santo, Luganille
28 Dec 1973 · 244 km away · intensity VII
Moderate damage ($1–5M)
1910M7.2
Espiritu Santo
10 Nov 1910 · 193 km away
Moderate damage ($1–5M)tsunami
2002M5.9
Mere Lava Island
27 Nov 2002 · 285 km away
Moderate damage ($1–5M)
1997M7.7
Santa Cruz Islands; Vanuatu
21 Apr 1997 · 39 km away
Limited damage (under $1M)tsunami
1980M7.5
Santa Cruz Islands: Banks
8 Jul 1980 · 22 km away
Limited damage (under $1M)tsunami
1980M6.1
Vanuatu Islands
12 May 1980 · 287 km away · intensity VI
Limited damage (under $1M)tsunami

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

Nearby trackers