QuakeScout
Magnitude5.7

Reviewed by USGS19y ago

M5.7 earthquake south of the Mariana Islands

Monday, November 12, 2007, 00:25:44 UTC · 10.449°N, 145.746°E

A magnitude 5.7 earthquake struck south of the Mariana Islands on Monday, November 12, 2007, 00:25:44 UTC, at a depth of 7.0 km (shallow). It is the strongest earthquake within 300 km since an M6.9 on September 30, 2007.

Magnitude
5.7
Moderate · mwc
Depth
7 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: 75 km aftershock search area

In context

How big was it, and why here?

Energy released

5 kilotons of TNT

That is about 1/3 of the Hiroshima bomb. It released about 11 times the energy of a magnitude 5.0.

Tectonic setting

209 km

from the nearest mapped plate boundary, between the Mariana and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.

Depth: shallow

7 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 75 km

USGS lists 4 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M5.2 on November 12, 2007. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M4M5M61h6h1d3d7d14d30dMainshock M5.7
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 5.1South of the Mariana Islands19y ago · 45 km E of this epicenter
  2. 4.6South of the Mariana Islands19y ago · 33 km E of this epicenter
  3. 5.2south of the Mariana Islands19y ago · 11 km SE of this epicenter
  4. 4.2South of the Mariana Islands19y ago · 29 km E of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 185 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.832 km S of Inarajan Village, GuamAugust 8, 1993 · 300 km N of this epicenter
  2. 7.2265 km S of Merizo Village, GuamJanuary 28, 1931 · 148 km W of this epicenter
  3. 7.1261 km S of Merizo Village, GuamMay 9, 1917 · 155 km W of this epicenter
  4. 7.098 km SSE of Inarajan Village, GuamDecember 9, 1909 · 234 km N of this epicenter
  5. 7.069 km SSE of Inarajan Village, GuamOctober 12, 2001 · 262 km N of this epicenter
  6. 6.9south of the Mariana IslandsSeptember 30, 2007 · 3 km W of this epicenter
  7. 6.4279 km S of Merizo Village, GuamMay 6, 1917 · 173 km W of this epicenter
  8. 6.2121 km SSW of Merizo Village, GuamJune 12, 1946 · 256 km NW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 3 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:

  1. 1993M7.8

    Tuman Bay, Apra Harbor

    8 Aug 1993 · 300 km away · intensity IX

    $250 million damagetsunami

  2. 1909M8.0

    Guam

    9 Dec 1909 · 242 km away · intensity VIII

    Moderate damage ($1–5M)tsunami

  3. 2001M7.0

    Guam

    12 Oct 2001 · 262 km away · intensity VIII

    Moderate damage ($1–5M)

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

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