Reviewed by USGSChile16y ago
M4.7 earthquake 46 km NNW of Tomé, Chile
Tuesday, June 29, 2010, 12:49:14 UTC · 36.234°S, 73.173°W
A magnitude 4.7 earthquake struck 46 km NNW of Tomé, Chile on Tuesday, June 29, 2010, 12:49:14 UTC, at a depth of 35.0 km (shallow). USGS received 3 “Did You Feel It?” reports, with a maximum reported intensity of III (weak). It is the strongest earthquake within 300 km since an M5.5 on June 29, 2010.
- Magnitude
- 4.7
- Light · mb
- Depth
- 35 km
- Shallow
- Felt reports
- 3
- Max intensity III
- 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
169 tons of TNT
That is about 1/89 of the Hiroshima bomb. A magnitude 5.0 releases about 3 times more energy.
Tectonic setting
91 km
from the nearest mapped plate boundary, between the Nazca 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
Reports sent by people to USGS, grouped by place (most reports first). Intensity uses the Modified Mercalli scale (I–X): what people felt, not the magnitude.
| Place | Intensity | Reports | Distance |
|---|---|---|---|
| Concepción, Bío Bío, Chile | III · Weak | 1 | 75 km |
| Talcahuano, Bío Bío, Chile | III · Weak | 1 | 66 km |
| Curicó, Maule, Chile | I · Not felt | 1 | 226 km |
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 M4.4 on July 15, 2010. 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 529 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 9.51960 Great Chilean Earthquake (Valdivia Earthquake)May 22, 1960 · 213 km S of this epicenter
- 8.82010 Maule, Chile EarthquakeFebruary 27, 2010 · 28 km NE of this epicenter
- 8.14 km ESE of Cañete, ChileMay 21, 1960 · 178 km S of this epicenter
- 7.826 km WNW of San Carlos, ChileJanuary 25, 1939 · 86 km E of this epicenter
- 7.838 km WNW of Traiguén, ChileMay 22, 1960 · 203 km S of this epicenter
- 7.730 km NNE of Constitución, ChileDecember 1, 1928 · 152 km NE of this epicenter
- 7.744 km SSE of Cañete, ChileMay 10, 1975 · 217 km S of this epicenter
- 7.7103 km NW of Constitución, ChileJanuary 30, 1914 · 164 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 26 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 33,255 recorded deaths. The most severe:
- 1939M8.3
Chillan
25 Jan 1939 · 83 km away · intensity X
30,000 deaths$920 million damagetsunami
- 1960M9.5
Puerto Montt, Valdivia
22 May 1960 · 213 km away · intensity XII
2,226 deaths$1.0 billion damagetsunami
- 2010M8.8
Maule, Concepcion, Talcahuano
27 Feb 2010 · 28 km away · intensity IX
558 deaths$30 billion damagetsunami
- 1928M7.6
Talca, Chillan, Santiago, San Fernando
1 Dec 1928 · 173 km away · intensity IX
279 deathsSevere damage ($5–24M)tsunami
- 1751M8.5
Concepcion, Chillan, Talca, Tutuben, Curico
25 May 1751 · 153 km away · intensity XI
65 deathsSevere damage ($5–24M)tsunami
- 1949M7.3
Angol, Traiguen
20 Apr 1949 · 198 km away
57 deathsModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.