Reviewed by USGSPhilippines115y ago
M6.6 earthquake 16 km E of Cagdianao, Philippines
Thursday, April 24, 1913, 10:15:25 UTC · 9.895°N, 125.813°E
A magnitude 6.6 earthquake struck 16 km E of Cagdianao, Philippines on Thursday, April 24, 1913, 10:15:25 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M7.7 on July 12, 1911.
- Magnitude
- 6.6
- Strong · 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 earthquakeDashed circle: 100 km aftershock search area
In context
How big was it, and why here?
Energy released
133 kilotons of TNT
That is about 9 times the Hiroshima bomb. It released about 279 times the energy of a magnitude 5.0.
Tectonic setting
92 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 100 km
USGS lists 3 M2.5+ earthquakes within 100 km in the following 30 days; the largest was M6.4 on April 24, 1913. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 9 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.774 km ENE of Barcelona, PhilippinesJuly 12, 1911 · 206 km SE of this epicenter
- 7.15 km N of Capoocan, PhilippinesMarch 5, 1908 · 205 km NW of this epicenter
- 7.110 km W of Bigaan, PhilippinesJuly 20, 1907 · 180 km S of this epicenter
- 6.640 km ENE of Cortes, PhilippinesApril 18, 1913 · 91 km SE of this epicenter
- 6.642 km E of Aras-asan, PhilippinesOctober 10, 1906 · 153 km SE of this epicenter
- 6.55 km SSW of Mantalongon, PhilippinesOctober 11, 1906 · 248 km W of this epicenter
- 6.475 km ENE of Sulangan, PhilippinesMay 20, 1907 · 152 km NE of this epicenter
- 6.34 km SSE of Binucayan, PhilippinesApril 18, 1913 · 188 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 15 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1879
Nw Mindanao: Surigao
30 Jun 1879 · 36 km away · intensity X
Extreme damage ($25M+)
- 1911M7.8
Mindanao: Talacogon,Davao,Butuan
12 Jul 1911 · 102 km away · intensity X
Severe damage ($5–24M)tsunami
- 1743
Leyte
Sep 1743 · 220 km away
Severe damage ($5–24M)
- 1871
Camiguin Island: Mambajao,Catarman
20 Feb 1871 · 147 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1885
E Mindanao: Surigao
22 Feb 1885 · 36 km away · intensity VIII
Severe damage ($5–24M)
- 1897M8.1
Northern Samar
18 Oct 1897 · 235 km away · intensity IX
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.