Reviewed by USGSMexico40y ago
M4.9 earthquake 38 km S of Coalcomán de Vázquez Pallares, Mexico
Tuesday, May 6, 1986, 13:16:42 UTC · 18.430°N, 103.162°W
A magnitude 4.9 earthquake struck 38 km S of Coalcomán de Vázquez Pallares, Mexico on Tuesday, May 6, 1986, 13:16:42 UTC, at a depth of 56.9 km (shallow). It is the strongest earthquake within 300 km since an M5.9 on May 5, 1986.
- Magnitude
- 4.9
- Light · mb
- Depth
- 57 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: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
338 tons of TNT
That is about 1/45 of the Hiroshima bomb. A magnitude 5.0 releases about 1 times more energy.
Tectonic setting
81 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
57 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 lists 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M4.5 on May 18, 1986. 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 128 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 · 172 km NW of this epicenter
- 8.01985 Michoacan, Mexico EarthquakeSeptember 19, 1985 · 72 km E of this epicenter
- 7.87 km E of Los Tepames, MexicoJune 18, 1932 · 84 km NW 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 · 33 km NE of this epicenter
- 7.619 km W of Arteaga, MexicoJune 7, 1911 · 73 km E of this epicenter
- 7.612 km SSE of Vallecitos de Zaragoza, MexicoMarch 14, 1979 · 211 km E of this epicenter
- 7.67 km N of Pantla, MexicoSeptember 21, 1985 · 175 km SE 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 · 72 km away · intensity IX
9,500 deaths$4.0 billion damagetsunami
- 1806M7.5
Jalisco,Oaxaca,Michoacan
25 Mar 1806 · 85 km away · intensity VIII
2,000 deathsExtreme damage ($25M+)
- 1818M8.2
Morelos-Guerrero,Mexico City,Guadalajara
31 May 1818 · 111 km away · intensity X
2,000 deathsSevere damage ($5–24M)tsunami
- 1932M8.1
Near Coast Of Jalisco
3 Jun 1932 · 155 km away · intensity X
400 deathsSevere damage ($5–24M)tsunami
- 1941M7.6
Michoacan, Colima, Jalisco
15 Apr 1941 · 33 km away · intensity VII
84 deaths$2 million damagetsunami
- 1964M7.3
Guerrero
6 Jul 1964 · 272 km away
78 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.