M4.9 earthquake 147 km WNW of Tobelo, Indonesia

Sunday, December 9, 2007, 02:23:01 UTC · 2.294°N, 126.807°E

A magnitude 4.9 earthquake struck 147 km WNW of Tobelo, Indonesia on Sunday, December 9, 2007, 02:23:01 UTC, at a depth of 75.2 km (intermediate). It is the strongest earthquake within 300 km since an M4.9 on December 5, 2007.

Magnitude: 4.9; Light · mb
Depth: 75 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: 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

2 km

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

Depth: intermediate

75 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 50 km

USGS lists 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.8 on December 21, 2007. 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 1,878 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 29 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2,979 recorded deaths. The most severe:

1856
Sangihe Pulau (Volcanic)
2 Mar 1856 · 211 km away
2,806 deathsSevere damage ($5–24M)tsunami
1845M7.0
N Sulawesi: Menado, Tikala, Tomohon
8 Feb 1845 · 236 km away · intensity IX
118 deathsModerate damage ($1–5M)tsunami
1855
Maluku: Ternate Island
14 Jul 1855 · 175 km away · intensity IX
34 deathsModerate damage ($1–5M)
1994M7.0
Kau
21 Jan 1994 · 176 km away
9 deathsModerate damage ($1–5M)tsunami
1932M7.7
Sulawesi: Kakas,Langowan,Poso,Tondano
14 May 1932 · 236 km away · intensity VII
7 deathsSevere damage ($5–24M)tsunami
2007M7.5
Molucca Islands: N
21 Jan 2007 · 149 km away
4 deathsLimited damage (under $1M)

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

Nearby trackers