Reviewed by USGSMexico36y ago
M5.0 earthquake 143 km SW of Emiliano Zapata, Mexico
Tuesday, January 1, 1991, 02:19:37 UTC · 18.355°N, 105.788°W
A magnitude 5.0 earthquake struck 143 km SW of Emiliano Zapata, Mexico on Tuesday, January 1, 1991, 02:19:37 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M6.3 on January 1, 1991.
- Magnitude
- 5.0
- Moderate · 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 earthquakeDashed circle: 75 km aftershock search area
In context
How big was it, and why here?
Energy released
477 tons of TNT
That is about 1/32 of the Hiroshima bomb. Each whole step in magnitude is about 32 times more energy.
Tectonic setting
35 km
from the nearest mapped plate boundary, between the Rivera and Cocos 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 75 km
USGS lists 1 M2.5+ earthquake within 75 km in the following 30 days; the largest was M5.8 on January 1, 1991. 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 133 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 · 252 km NE of this epicenter
- 7.87 km E of Los Tepames, MexicoJune 18, 1932 · 249 km E of this epicenter
- 7.712 km NNE of La Central, MexicoJune 22, 1932 · 178 km NE of this epicenter
- 7.621 km ESE of Coalcomán de Vázquez Pallares, MexicoApril 15, 1941 · 297 km E of this epicenter
- 7.535 km SW of Aguililla, MexicoJanuary 30, 1973 · 295 km E of this epicenter
- 7.0102 km SW of Barra de Navidad, MexicoNovember 30, 1934 · 53 km E of this epicenter
- 7.041 km SSW of Aguililla, MexicoApril 30, 1986 · 297 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 20 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4,615 recorded deaths. The most severe:
- 1806M7.5
Jalisco,Oaxaca,Michoacan
25 Mar 1806 · 218 km away · intensity VIII
2,000 deathsExtreme damage ($25M+)
- 1818M8.2
Morelos-Guerrero,Mexico City,Guadalajara
31 May 1818 · 212 km away · intensity X
2,000 deathsSevere damage ($5–24M)tsunami
- 1932M8.1
Near Coast Of Jalisco
3 Jun 1932 · 242 km away · intensity X
400 deathsSevere damage ($5–24M)tsunami
- 1941M7.6
Michoacan, Colima, Jalisco
15 Apr 1941 · 297 km away · intensity VII
84 deaths$2 million damagetsunami
- 1932M7.7
Central
22 Jun 1932 · 178 km away
75 deathsSevere damage ($5–24M)tsunami
- 1973M7.5
S, Farias, Tecoman
30 Jan 1973 · 294 km away
56 deathsModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.