# Séisme mineur mag. 1.3 - Quarry Blast - 45km NE of Holtville, CA, mercredi, 22 sept. 2021 11:13 (GMT -7) - writeAge(1632334390)

Quakes around its antipode during the following 3 jours
Check different time intervals: 24 hours | 2 days
Date & heure: 22 Sep 2021 18:13:10 UTC -
Heure locale à l'épicentre: mercredi, 22 sept. 2021 11:13 (GMT -7)
Magnitude: 1.3
Profondeur: 0.3 km
Épicentre latitude / longitude: 33.0612°N / 115.0037°W (Californie, États-Unis)
Antipode sismique latitude / longitude: 33.061°S / 64.996°E
Source de données principale: USGS (United States Geological Survey)
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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 4. This is compared to the average number of 0.65 quakes during preceding intervals of 3 jours with a standard deviation (σ) of 0.9, calculated by analzing all 100 preceding intervals of 3 jours for the same region.
Interpretation:
Note: At a magnitude of 1.3, 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 a weak increase in detected quakes around the antipode during the following 3 jours.
 Mag class Total # Average σ Observed deviation 6+ 0 0 0.1 -0 (-0.1σ) 5+ 0 0.1 0.3 -0.1 (-0.4σ) 4+ 0 0.2 0.4 -0.2 (-0.5σ) 3+ 4 0.3 0.7 3.7 (5.2σ) Total 4 0.65 0.9 3.4 (3.6σ)
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: 4).
 Date et l'heure MagProfondeur Lieu Détail 23 Sep 2021 11:41:44 GMT(17 heures after quake) 3.041 km Mayotte: Near Mamoudzou [Show on map] Plus 23 Sep 2021 23:54:57 GMT(1 jour 6 heures after quake) 3.341 km Near Mamoudzou, Mamoudzou, Mayotte [Show on map] Plus 24 Sep 2021 04:57:13 GMT(1 jour 11 heures after quake) 3.041 km Mayotte: Near Mamoudzou [Show on map] Plus 25 Sep 2021 09:09:38 GMT(3 jours after quake) 3.032 km Mayotte: Near Mamoudzou [Show on map] Plus
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