Reviewed by USGSMexico40y ago
M4.5 earthquake 40 km SE of Aquila, Mexico
Sunday, May 18, 1986, 23:25:42 UTC · 18.320°N, 103.257°W
A magnitude 4.5 earthquake struck 40 km SE of Aquila, Mexico on Sunday, May 18, 1986, 23:25:42 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M4.9 on May 15, 1986.
- Magnitude
- 4.5
- Light · mb
- Depth
- 33 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
85 tons of TNT
That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.
Tectonic setting
66 km
from the nearest mapped plate boundary, between the Cocos and North American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
33 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 50 km
USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 131 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.11932 Jalisco, Mexico EarthquakeJune 3, 1932 · 179 km NW of this epicenter
- 8.01985 Michoacan, Mexico EarthquakeSeptember 19, 1985 · 78 km E of this epicenter
- 7.87 km E of Los Tepames, MexicoJune 18, 1932 · 91 km N of this epicenter
- 7.712 km NNE of La Central, MexicoJune 22, 1932 · 157 km NW of this epicenter
- 7.621 km ESE of Coalcomán de Vázquez Pallares, MexicoApril 15, 1941 · 49 km NE of this epicenter
- 7.619 km W of Arteaga, MexicoJune 7, 1911 · 83 km E of this epicenter
- 7.612 km SSE of Vallecitos de Zaragoza, MexicoMarch 14, 1979 · 217 km E of this epicenter
- 7.67 km N of Pantla, MexicoSeptember 21, 1985 · 180 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 39 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 14,289 recorded deaths. The most severe:
- 1985M8.1
Michoacan: Mexico City
19 Sep 1985 · 78 km away · intensity IX
9,500 deaths$4.0 billion damagetsunami
- 1806M7.5
Jalisco,Oaxaca,Michoacan
25 Mar 1806 · 86 km away · intensity VIII
2,000 deathsExtreme damage ($25M+)
- 1818M8.2
Morelos-Guerrero,Mexico City,Guadalajara
31 May 1818 · 113 km away · intensity X
2,000 deathsSevere damage ($5–24M)tsunami
- 1932M8.1
Near Coast Of Jalisco
3 Jun 1932 · 161 km away · intensity X
400 deathsSevere damage ($5–24M)tsunami
- 1941M7.6
Michoacan, Colima, Jalisco
15 Apr 1941 · 49 km away · intensity VII
84 deaths$2 million damagetsunami
- 1964M7.3
Guerrero
6 Jul 1964 · 281 km away
78 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.