Reviewed by USGSPhilippines108y ago
M6.6 earthquake 7 km ENE of South Upi, Philippines
Friday, September 26, 1919, 19:39:43 UTC · 6.864°N, 124.214°E
A magnitude 6.6 earthquake struck 7 km ENE of South Upi, Philippines on Friday, September 26, 1919, 19:39:43 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M6.6 on March 16, 1919.
- Magnitude
- 6.6
- Strong · mw
- Depth
- 35 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
120 kilotons of TNT
That is about 8 times the Hiroshima bomb. It released about 251 times the energy of a magnitude 5.0.
Tectonic setting
334 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: 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
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 100 km
USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 20 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 · 149 km S of this epicenter
- 7.947 km ESE of Kalbay, PhilippinesMarch 14, 1913 · 236 km SE of this epicenter
- 7.222 km ESE of Bobon, PhilippinesJanuary 1, 1919 · 255 km E of this epicenter
- 7.110 km W of Bigaan, PhilippinesJuly 20, 1907 · 271 km NE of this epicenter
- 6.937 km S of Daliao, PhilippinesJanuary 31, 1917 · 168 km SE of this epicenter
- 6.94 km ESE of Panikian, PhilippinesFebruary 7, 1918 · 204 km E of this epicenter
- 6.837 km E of Lamitan, PhilippinesMarch 6, 1911 · 222 km SE of this epicenter
- 6.8173 km SW of Palimbang, PhilippinesSeptember 11, 1915 · 235 km SW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 19 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 214 recorded deaths. The most severe:
- 1913M7.8
Sangihe Island
14 Mar 1913 · 270 km away · intensity IX
138 deathsModerate damage ($1–5M)tsunami
- 1918M8.3
Mindanao: Cotabato
15 Aug 1918 · 149 km away · intensity X
52 deathsSevere damage ($5–24M)tsunami
- 1897M8.7
Mindanao, Zamboanga, Sulu, Isabela
21 Sep 1897 · 263 km away · intensity IX
13 deathsSevere damage ($5–24M)tsunami
- 1917M6.4
S Mindanao: Glan,Glan Padidu,Tuyan
31 Jan 1917 · 130 km away · intensity IX
7 deathsModerate damage ($1–5M)tsunami
- 1870
Mindanao: Davao,Blanco
4 Nov 1870 · 132 km away
4 deathsModerate damage ($1–5M)
- 1902M7.3
Mindanao: Lanao, Cotabato
21 Aug 1902 · 106 km away · intensity X
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.