Reviewed by USGSPhilippines120y ago
M7.1 earthquake 10 km W of Bigaan, Philippines
Saturday, July 20, 1907, 13:38:22 UTC · 8.316°N, 126.188°E
A magnitude 7.1 earthquake struck 10 km W of Bigaan, Philippines on Saturday, July 20, 1907, 13:38:22 UTC, at a depth of 35.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 7.1
- Major · mw
- Depth
- 35 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
587 kilotons of TNT
That is about 39 times the Hiroshima bomb. It released about 1,230 times the energy of a magnitude 5.0.
Tectonic setting
104 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 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 3 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4 recorded deaths. The most severe:
- 1870
Mindanao: Davao,Blanco
4 Nov 1870 · 170 km away
4 deathsModerate damage ($1–5M)
- 1879
Nw Mindanao: Surigao
30 Jun 1879 · 181 km away · intensity X
Extreme damage ($25M+)
- 1871
Camiguin Island: Mambajao,Catarman
20 Feb 1871 · 194 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1871
W Mindanao: Cotabato,Polloc Harbor
8 Dec 1871 · 242 km away · intensity IX
Severe damage ($5–24M)
- 1885
E Mindanao: Surigao
22 Feb 1885 · 181 km away · intensity VIII
Severe damage ($5–24M)
- 1903M7.8
Davao Gulf
28 Dec 1903 · 148 km away · intensity VIII
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.