# Light mag. 3.6 earthquake - Santa Maria Huazolotitlan, 22 km southeast of Santiago Pinotepa Nacional, Mexico, on Sunday, Sep 12, 2021 3:16 pm (GMT -5) - writeAge(1631477806)

Quakes around its antipode during the following 3 days
Check different time intervals: 24 hours | 2 days
Date & time: 12 Sep 2021 20:16:46 UTC -
Local time at epicenter: Sunday, Sep 12, 2021 3:16 pm (GMT -5)
Magnitude: 3.6
Depth: 5 km
Epicenter latitude / longitude: 16.17°N / 97.94°W (Santa Maria Huazolotitlan, Oaxaca, Mexico)
Antipode latitude / longitude: 16.17°S / 82.06°E
Primary data source: SSN (Servicio Sismológico Nacional)
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## Quakes within 30 degrees from seismic antipode up to 3 days 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 days around the antipode of the quake was 15. This is compared to the average number of 11.01 quakes during preceding intervals of 3 days with a standard deviation (σ) of 8.4, calculated by analzing all 100 preceding intervals of 3 days for the same region.
Interpretation:
Note: At a magnitude of 3.6, 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 days.
 Mag class Total # Average σ Observed deviation 6+ 0 0 0.2 -0 (-0.2σ) 5+ 1 0.6 0.9 0.4 (0.4σ) 4+ 3 3 2.8 -0 (-0σ) 3+ 11 7.3 6.1 3.7 (0.6σ) Total 15 11.01 8.4 4 (0.5σ)
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

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Showing quakes magnitude 3.0 or higher (total: 15).
 Date and time MagDepth Location Details 12 Sep 2021 22:37:40 GMT(2 hours and 21 minutes after quake) 3.733 km Northern Sumatra, Indonesia [Show on map] More 12 Sep 2021 22:37:49 GMT(2 hours and 21 minutes after quake) 3.410 km Northern Sumatra, Indonesia [Show on map] More 13 Sep 2021 14:09:36 GMT(18 hours after quake) 3.611 km Java, Indonesia [Show on map] More 13 Sep 2021 18:26:38 GMT(22 hours after quake) 3.414 km Indonesia: Off West Coast of Northern Sumatra [Show on map] More 14 Sep 2021 07:41:32 GMT(1 day 11 hours after quake) 3.210 km Southern Sumatra, Indonesia [Show on map] More 14 Sep 2021 09:08:42 GMT(1 day 13 hours after quake) 4.416 km Java, Indonesia [Show on map] More 14 Sep 2021 09:14:35 GMT(1 day 13 hours after quake) 4.110 km Java, Indonesia [Show on map] More 14 Sep 2021 18:34:14 GMT(1 day 22 hours after quake) 3.520 km Southern Sumatra, Indonesia [Show on map] More 14 Sep 2021 20:13:57 GMT(1 day 24 hours after quake) 5.648 km Indonesia: Off West Coast of Northern Sumatra [Show on map] More 15 Sep 2021 07:54:31 GMT(2 days after quake) 4.7112 km Mid Indian Ridge [Show on map] More 15 Sep 2021 08:12:37 GMT(2 days after quake) 3.310 km Northern Sumatra, Indonesia [Show on map] More 15 Sep 2021 11:31:27 GMT(3 days after quake) 3.4167 km Northern Sumatra, Indonesia [Show on map] More 15 Sep 2021 16:09:21 GMT(3 days after quake) 3.821 km Java, Indonesia [Show on map] More 15 Sep 2021 16:17:00 GMT(3 days after quake) 3.527 km Southern Sumatra, Indonesia [Show on map] More 15 Sep 2021 16:35:20 GMT(3 days after quake) 3.410 km Southern Sumatra, Indonesia [Show on map] More
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