M5.5 earthquake 111 km SW of Lata, Solomon Islands

Monday, March 11, 2013, 17:12:13 UTC · 11.531°S, 165.186°E

A magnitude 5.5 earthquake struck 111 km SW of Lata, Solomon Islands on Monday, March 11, 2013, 17:12:13 UTC, at a depth of 10.0 km (shallow). The USGS PAGER alert is green: low likelihood of casualties and damage. It is the strongest earthquake within 300 km since an M5.8 on February 28, 2013.

Magnitude: 5.5; Moderate · mww
Depth: 10 km; Shallow
Felt reports: 0; Did You Feel It?
Est. shaking: VII; Very strong (ShakeMap)
PAGER alert: Green; Impact estimate
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

3 kilotons of TNT

That is about 1/6 of the Hiroshima bomb. It released about 6 times the energy of a magnitude 5.0.

Tectonic setting

15 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

10 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 populated area was estimated to feel noticeable shaking.

After the main event

Aftershocks within 75 km

USGS lists 8 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M4.7 on March 25, 2013. 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 1,513 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 23 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 10 recorded deaths. The most severe:

2013M7.9
Santa Cruz Islands
6 Feb 2013 · 82 km away · intensity VIII
10 deaths$36 million damagetsunami
1997M7.7
Santa Cruz Islands; Vanuatu
21 Apr 1997 · 200 km away
Limited damage (under $1M)tsunami
1980M7.5
Santa Cruz Islands: Banks
8 Jul 1980 · 163 km away
Limited damage (under $1M)tsunami
1980M7.9
Santa Cruz Islands; Vanuatu
17 Jul 1980 · 136 km away
tsunami
1934M7.8
Santa Cruz Islands
18 Jul 1934 · 173 km away
tsunami
1957M7.8
Santa Cruz Islands
17 Dec 1957 · 186 km away

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

Nearby trackers