Reviewed by USGSPhilippines98y ago
M5.6 earthquake 3 km NNE of Tandag, Philippines
Tuesday, July 9, 1929, 17:23:33 UTC · 9.108°N, 126.209°E
A magnitude 5.6 earthquake struck 3 km NNE of Tandag, Philippines on Tuesday, July 9, 1929, 17:23:33 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M5.6 on July 2, 1929.
- Magnitude
- 5.6
- Moderate · mw
- Depth
- 15 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 earthquake
In context
How big was it, and why here?
Energy released
4 kilotons of TNT
That is about 1/4 of the Hiroshima bomb. It released about 8 times the energy of a magnitude 5.0.
Tectonic setting
76 km
from the nearest mapped plate boundary, between the Philippine Sea and Sunda plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 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 75 km
USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 60 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.11924 Mindanao, Philippines EarthquakeApril 14, 1924 · 276 km S of this epicenter
- 7.774 km ENE of Barcelona, PhilippinesJuly 12, 1911 · 113 km SE of this epicenter
- 7.462 km E of Baculin, PhilippinesNovember 11, 1921 · 211 km SE of this epicenter
- 7.222 km ESE of Bobon, PhilippinesJanuary 1, 1919 · 258 km S of this epicenter
- 7.25 km ESE of Veruela, PhilippinesJune 13, 1929 · 120 km S of this epicenter
- 7.270 km ENE of La Paz, PhilippinesApril 25, 1913 · 72 km E of this epicenter
- 7.270 km E of Aras-asan, PhilippinesAugust 30, 1924 · 82 km E of this epicenter
- 7.25 km NW of Kadingilan, PhilippinesMarch 2, 1923 · 220 km SW of this epicenter
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 9 recorded deaths. The most severe:
- 1922M6.3
Cebu Island, Mactan Island
27 Feb 1922 · 261 km away · intensity V
5 deathsModerate damage ($1–5M)tsunami
- 1870
Mindanao: Davao,Blanco
4 Nov 1870 · 251 km away
4 deathsModerate damage ($1–5M)
- 1879
Nw Mindanao: Surigao
30 Jun 1879 · 109 km away · intensity X
Extreme damage ($25M+)
- 1924M8.3
E Mindanao: Mati,Suriga
14 Apr 1924 · 292 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1911M7.8
Mindanao: Talacogon,Davao,Butuan
12 Jul 1911 · 26 km away · intensity X
Severe damage ($5–24M)tsunami
- 1871
Camiguin Island: Mambajao,Catarman
20 Feb 1871 · 169 km away · intensity IX
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.