Reviewed by USGSPhilippines43y ago
M7.3 earthquake 4 km NNW of Tabid, Philippines
Monday, March 5, 1984, 03:33:50 UTC · 8.147°N, 123.762°E
A magnitude 7.3 earthquake struck 4 km NNW of Tabid, Philippines on Monday, March 5, 1984, 03:33:50 UTC, at a depth of 649.1 km (deep). It is the strongest earthquake within 300 km since an M7.9 on August 16, 1976.
- Magnitude
- 7.3
- Major · mw
- Depth
- 649 km
- Deep
- 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
1.3 megatons of TNT
That is about 89 times the Hiroshima bomb. It released about 2,818 times the energy of a magnitude 5.0.
Tectonic setting
365 km
from the nearest mapped plate boundary, between the Philippine Sea and Sunda plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: deep
649 km
Deep earthquakes (over 300 km) happen deep inside subducting plates. They rarely cause damage, but can be felt faintly over very large distances.
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 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 314 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 · 291 km S of this epicenter
- 7.919 km WNW of Palimbang, PhilippinesAugust 16, 1976 · 212 km S of this epicenter
- 7.410 km ESE of Basak, PhilippinesDecember 19, 1928 · 169 km S of this epicenter
- 7.4Mindanao, PhilippinesMarch 31, 1955 · 86 km SW of this epicenter
- 7.312 km SSW of Kipit, PhilippinesOctober 20, 1942 · 144 km W of this epicenter
- 7.25 km ESE of Veruela, PhilippinesJune 13, 1929 · 247 km E of this epicenter
- 7.25 km NW of Kadingilan, PhilippinesMarch 2, 1923 · 135 km SE of this epicenter
- 7.110 km W of Bigaan, PhilippinesJuly 20, 1907 · 268 km E 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 8,647 recorded deaths. The most severe:
- 1976M8.0
Mindanao: S
16 Aug 1976 · 209 km away · intensity VI
8,000 deaths$134 million damagetsunami
- 1955M7.4
Mindanao: Lanao,Ozamiz,Cotabato
31 Mar 1955 · 86 km away · intensity VIII
465 deaths$5 million damagetsunami
- 1928M7.4
Cotabato,N Coast Of Illana Bay
19 Dec 1928 · 169 km away · intensity VII
97 deathsModerate damage ($1–5M)tsunami
- 1918M8.3
Mindanao: Cotabato
15 Aug 1918 · 291 km away · intensity X
52 deathsSevere damage ($5–24M)tsunami
- 1925M6.8
W. Luzon Island, Philippines
5 May 1925 · 173 km away · intensity IX
17 deathsModerate damage ($1–5M)tsunami
- 1917M6.4
S Mindanao: Glan,Glan Padidu,Tuyan
31 Jan 1917 · 275 km away · intensity IX
7 deathsModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.