# Séisme ou événement semblable à un séisme non confirmé: 5 km à l'ouest de Mexico, Mexique, mardi, 21 sept. 2021 18:15 (GMT -5) - writeAge(1632266117)

Quakes around its antipode during the following 3 jours
Check different time intervals: 24 hours | 2 days
Date & heure: 21 Sep 2021 23:15:17 UTC -
Heure locale à l'épicentre: mardi, 21 sept. 2021 18:15 (GMT -5)
Magnitude: 3.8?
Profondeur: ? km
Épicentre latitude / longitude: 19.4219°N / 99.1745°W (Mexico City, Mexique)
Antipode latitude / longitude: 19.422°S / 80.826°E
Source de données principale: VolcanoDiscovery
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## Quakes within 30 degrees from seismic antipode up to 3 jours after the quake

The area around the antipode is marked with the big circle on the map.
The total number of quakes that occurred within 3 jours around the antipode of the quake was 5. This is compared to the average number of 6.28 quakes during preceding intervals of 3 jours with a standard deviation (σ) of 5.2, calculated by analzing all 100 preceding intervals of 3 jours for the same region.
Interpretation:
Note: At a magnitude of 3.8, it is unlikely that this quake could affect areas around its antipode. If an increase or decrease of quake is detected, it is likely caused by other factors.
There is no significant variation in the number of quakes that occurred around the antipode within 3 jours.
 Mag class Total # Average σ Observed deviation 6+ 0 0 0.2 -0 (-0.2σ) 5+ 0 0.6 0.8 -0.6 (-0.6σ) 4+ 3 2 2 1 (0.5σ) 3+ 2 3.7 3.2 -1.7 (-0.5σ) Total 5 6.28 5.2 -1.3 (-0.2σ)
Explanation:
BLACK = Number of quakes within normal statistical range
RED = Significantly lower than normal number of quakes
GREEN = Significantly higher than normal number of quakes

## List of quakes

Showing quakes magnitude 3.0 or higher (total: 5).
 Date et l'heure MagProfondeur Lieu Détail 22 Sep 2021 17:30:10 GMT(18 heures after quake) 4.510 km Indonesia: Off West Coast of Northern Sumatra [Show on map] Plus 22 Sep 2021 23:08:07 GMT(24 heures after quake) 3.828 km Southern Sumatra, Indonesia [Show on map] Plus 23 Sep 2021 09:16:11 GMT(1 jour 10 heures after quake) 3.711 km Southwest of Sumatra, Indonesia [Show on map] Plus 23 Sep 2021 19:48:48 GMT(1 jour 21 heures after quake) 4.110 km Sri Lanka: Indian Ocean [Show on map] Plus 24 Sep 2021 05:49:51 GMT(2 jours after quake) 4.182 km Southwest of Sumatra, Indonesia [Show on map] Plus
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