Reviewed by USGS92y ago
M6.7 earthquake in Mariana Islands region
Friday, October 18, 1935, 11:05:26 UTC · 12.523°N, 141.428°E
A magnitude 6.7 earthquake struck in Mariana Islands region on Friday, October 18, 1935, 11:05:26 UTC, at a depth of 20.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.7
- Strong · mw
- Depth
- 20 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
188 kilotons of TNT
That is about 12 times the Hiroshima bomb. It released about 394 times the energy of a magnitude 5.0.
Tectonic setting
155 km
from the nearest mapped plate boundary, between the Philippine Sea and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
20 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 14 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 6.5State of Yap, Federated States of MicronesiaFebruary 7, 1913 · 216 km W of this epicenter
- 6.3193 km ENE of Fais, MicronesiaMarch 30, 1919 · 232 km S of this epicenter
- 6.3146 km WSW of Merizo Village, GuamNovember 24, 1917 · 216 km E of this epicenter
- 6.2242 km NNE of Fais, MicronesiaJanuary 17, 1929 · 103 km S of this epicenter
- 6.1130 km NNE of Fais, MicronesiaDecember 31, 1929 · 196 km S of this epicenter
- 6.1240 km N of Fais, MicronesiaFebruary 13, 1928 · 104 km SW of this epicenter
- 6.0247 km NE of Fais, MicronesiaJuly 17, 1925 · 143 km SE of this epicenter
- 6.0206 km SW of Merizo Village, GuamMay 1, 1929 · 218 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 6 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1849M7.5
Guam
25 Jan 1849 · 261 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1892M7.5
Guam
16 May 1892 · 261 km away · intensity VIII
Moderate damage ($1–5M)tsunami
- 1825
Ladrones Island
Apr 1825 · 261 km away · intensity VIII
Moderate damage ($1–5M)tsunami
- 1834
Agana
May 1834 · 261 km away
Moderate damage ($1–5M)
- 1903
Guam
10 Feb 1903 · 261 km away · intensity VII
Limited damage (under $1M)tsunami
- 1809
Guam
1809 · 261 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.