Reviewed by USGSSolomon Islands49y ago
M4.9 earthquake 131 km WNW of Gizo, Solomon Islands
Tuesday, August 2, 1977, 10:19:17 UTC · 7.705°S, 155.718°E
A magnitude 4.9 earthquake struck 131 km WNW of Gizo, Solomon Islands on Tuesday, August 2, 1977, 10:19:17 UTC, at a depth of 62.0 km (shallow). It is the strongest earthquake within 300 km since an M5.2 on August 1, 1977.
- Magnitude
- 4.9
- Light · mb
- Depth
- 62 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
338 tons of TNT
That is about 1/45 of the Hiroshima bomb. A magnitude 5.0 releases about 1 times more energy.
Tectonic setting
5 km
from the nearest mapped plate boundary, between the Pacific and Woodlark plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
62 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 M5.0 on August 5, 1977. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 421 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.956 km WSW of Panguna, Papua New GuineaJuly 20, 1975 · 144 km NW of this epicenter
- 7.885 km S of Panguna, Papua New GuineaJanuary 30, 1939 · 78 km NW of this epicenter
- 7.794 km SSW of Panguna, Papua New GuineaJuly 20, 1975 · 91 km NW of this epicenter
- 7.361 km NW of Gizo, Solomon IslandsApril 19, 1936 · 87 km E of this epicenter
- 7.2155 km WNW of Panguna, Papua New GuineaOctober 19, 1949 · 273 km NW of this epicenter
- 7.2282 km SW of Panguna, Papua New GuineaOctober 23, 1974 · 202 km SW of this epicenter
- 7.2143 km W of Gizo, Solomon IslandsJuly 29, 1977 · 41 km SW of this epicenter
- 7.1110 km SE of Gizo, Solomon IslandsMarch 27, 1926 · 233 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 8 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 5 recorded deaths. The most severe:
- 1939M7.7
Bougainville Island
30 Jan 1939 · 79 km away
5 deathsModerate damage ($1–5M)tsunami
- 1975M7.9
Bismarck Sea: Bougainville
20 Jul 1975 · 144 km away · intensity VIII
Severe damage ($5–24M)tsunami
- 1959M7.3
Solomon Islands
17 Aug 1959 · 39 km away
Severe damage ($5–24M)tsunami
- 1974M7.1
Solomon Islands
1 Feb 1974 · 36 km away · intensity VI
Moderate damage ($1–5M)tsunami
- 1907M7.7
New Britain
4 May 1907 · 224 km away
- 1975M7.7
Solomon Islands: Buin, Boku
20 Jul 1975 · 91 km away · intensity VII
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.