Evening Seismic Activity Report
On July 6, 2026, Mexico experienced a series of earthquakes concentrated mainly in the southern region of Oaxaca. These tremors varied in magnitude from 3.2 to 4.3 and were predominantly located south and southeast of Salina Cruz.
Notable Earthquakes in Oaxaca
Two significant earthquakes stood out during this seismic event. The first recorded a magnitude of 4.3, situated approximately 50 kilometers south of Salina Cruz at a depth of 14.6 kilometers. The second, also measuring 4.3 on the Richter scale, was detected 131 kilometers southeast of the same city, with a depth of 15.0 kilometers.
In addition to these tremors, seismic activity was recorded in other states including Michoacán and Chiapas, where they registered magnitudes of 3.8 and 3.6, respectively. The following list outlines the main earthquakes reported on this day:
Salina Cruz, Oaxaca:
- 4.3 (50 km south)
- 4.3 (131 km southeast)
- Additional smaller tremors: 3.5, 3.4, 3.3, 3.2, and 3.6
Coalcomán, Michoacán: 3.8
Motozintla, Chiapas: 3.6
Detailed Reports of Significant Tremors
The National Seismological Service provided further details on individual seismic events throughout the day.
First 4.3 Magnitude Earthquake:
- Occurred at 3:46:50 PM, located 50 km south of Salina Cruz, at coordinates (latitude 15.727, longitude -95.194).
Second 4.3 Magnitude Earthquake:
- Occurred at 1:07:56 PM, located 131 km southeast of Salina Cruz, with coordinates (latitude 15.062, longitude -94.796).
4.0 Magnitude Earthquake:
- Detected at 10:23:51 AM, 64 kilometers southwest of Las Choapas, Veracruz.
4.2 Magnitude Earthquake:
- Recorded at 09:30:03 AM, located 13 kilometers east of Motozintla, Chiapas.
Morning Seismicity Overview
Between midnight and 5 AM on the same day, at least 19 earthquakes were detected across different regions of Mexico. The magnitudes of these tremors ranged from 1.8 to 3.8 degrees, mostly mild and likely imperceptible to the public.
Key Insights from the Early Hours
- Magnitude: Most earthquakes recorded were less than 4 degrees.
- Time of Occurrence: All notable tremors occurred in the early morning hours, the last being at 4:53 AM.
- Geographical Distribution:
- Baja California Sur: Largest quake – 3.8 northeast of Santa Rosalía.
- Oaxaca: Notable seismic activity with some quakes exceeding 100 km in depth.
Seismic Characteristics
Surprisingly, some earthquakes were more than 100 km deep, resulting in less noticeable surface impact. For instance, several minor earthquakes were detected primarily in the southern and southwestern regions, particularly Oaxaca, Chiapas, and along the Pacific coast.
Mexico’s Seismic Situation
Mexico resides in a highly seismic region due to the interactions of five tectonic plates: Caribbean, North America, Pacific, Rivera, and Cocos. This continual tectonic activity places the nation in an area of elevated seismic risk, ensuring that monitoring remains crucial for public safety and awareness.
In conclusion, while the series of earthquakes on July 6, 2026, were significant, most were mild and posed little danger to the population. The effective monitoring by the National Seismological Service remains essential in providing timely updates and ensuring public safety.