Reviewed by USGSPhilippines54y ago
M4.6 earthquake 35 km SSE of Tamisan, Philippines
Friday, April 13, 1973, 00:10:38 UTC · 6.560°N, 126.449°E
A magnitude 4.6 earthquake struck 35 km SSE of Tamisan, Philippines on Friday, April 13, 1973, 00:10:38 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M4.6 on April 7, 1973.
- Magnitude
- 4.6
- Light · mb
- Depth
- 33 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
120 tons of TNT
That is about 1/126 of the Hiroshima bomb. A magnitude 5.0 releases about 4 times more energy.
Tectonic setting
88 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
33 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 has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 258 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.31918 Mindanao, Philippines EarthquakeAugust 15, 1918 · 294 km SW of this epicenter
- 8.11924 Mindanao, Philippines EarthquakeApril 14, 1924 · 32 km W of this epicenter
- 8.01972 Mindanao, Philippines EarthquakeDecember 2, 1972 · 28 km SE of this epicenter
- 7.947 km ESE of Kalbay, PhilippinesMarch 14, 1913 · 129 km SW of this epicenter
- 7.877 km E of Baculin, PhilippinesMay 25, 1943 · 128 km NE of this epicenter
- 7.8161 km SE of Sarangani, PhilippinesApril 1, 1936 · 255 km S of this epicenter
- 7.774 km ENE of Barcelona, PhilippinesJuly 12, 1911 · 224 km N of this epicenter
- 7.6101 km SE of Sarangani, PhilippinesDecember 16, 1910 · 216 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 31 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 298 recorded deaths. The most severe:
- 1913M7.8
Sangihe Island
14 Mar 1913 · 139 km away · intensity IX
138 deathsModerate damage ($1–5M)tsunami
- 1928M7.4
Cotabato,N Coast Of Illana Bay
19 Dec 1928 · 244 km away · intensity VII
97 deathsModerate damage ($1–5M)tsunami
- 1918M8.3
Mindanao: Cotabato
15 Aug 1918 · 294 km away · intensity X
52 deathsSevere damage ($5–24M)tsunami
- 1917M6.4
S Mindanao: Glan,Glan Padidu,Tuyan
31 Jan 1917 · 172 km away · intensity IX
7 deathsModerate damage ($1–5M)tsunami
- 1870
Mindanao: Davao,Blanco
4 Nov 1870 · 126 km away
4 deathsModerate damage ($1–5M)
- 1924M8.3
E Mindanao: Mati,Suriga
14 Apr 1924 · 9 km away · intensity IX
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.