M4.6 earthquake 148 km SSE of Lata, Solomon Islands

Tuesday, October 27, 2009, 14:18:05 UTC · 12.014°S, 166.190°E

A magnitude 4.6 earthquake struck 148 km SSE of Lata, Solomon Islands on Tuesday, October 27, 2009, 14:18:05 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: 4.6; Light · 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: 50 km aftershock search area

In context

How big was it, and why here?

Energy released

120 tons of TNT

That is about 1/126 of the Hiroshima bomb. A magnitude 5.0 releases about 4 times more energy.

Tectonic setting

46 km

from the nearest mapped plate boundary, between the African and South American 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 50 km

USGS lists 11 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.6 on November 14, 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 1,376 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 · 276 km away · intensity VII
Moderate damage ($1–5M)
1910M7.2
Espiritu Santo
10 Nov 1910 · 223 km away
Moderate damage ($1–5M)tsunami
1997M7.7
Santa Cruz Islands; Vanuatu
21 Apr 1997 · 82 km away
Limited damage (under $1M)tsunami
1980M7.5
Santa Cruz Islands: Banks
8 Jul 1980 · 49 km away
Limited damage (under $1M)tsunami
1980M7.9
Santa Cruz Islands; Vanuatu
17 Jul 1980 · 64 km away
tsunami
1934M7.8
Santa Cruz Islands
18 Jul 1934 · 60 km away
tsunami

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

Nearby trackers