# Light mag. 4.2 earthquake - North Pacific Ocean, 79 km southeast of Salina Cruz, Oaxaca, Mexico, on Saturday, Sep 18, 2021 9:38 am (GMT -6) - writeAge(1631979483)

Quakes around its antipode during the following 3 days
Check different time intervals: 24 hours | 2 days
Date & time: 18 Sep 2021 15:38:03 UTC -
Local time at epicenter: Saturday, Sep 18, 2021 9:38 am (GMT -6)
Magnitude: 4.2
Depth: 33 km
Epicenter latitude / longitude: 15.55°N / 94.85°W (North Pacific Ocean, Mexico)
Antipode latitude / longitude: 15.55°S / 85.15°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 12.56 quakes during preceding intervals of 3 days with a standard deviation (σ) of 8.6, calculated by analzing all 100 preceding intervals of 3 days for the same region.
Interpretation:
Note: At a magnitude of 4.2, 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 0.1 0.2 -0.1 (-0.2σ) 5+ 0 0.7 1 -0.7 (-0.7σ) 4+ 3 3.6 2.8 -0.6 (-0.2σ) 3+ 12 8.3 6.2 3.8 (0.6σ) Total 15 12.56 8.6 2.4 (0.3σ)
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

Filter by magnitude:
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3.0+
4.0+
Showing quakes magnitude 3.0 or higher (total: 15).
 Date and time MagDepth Location Details 18 Sep 2021 21:24:02 GMT(6 hours after quake) 3.910 km Java, Indonesia [Show on map] More 18 Sep 2021 23:38:53 GMT(8 hours after quake) 4.842 km Java, Indonesia [Show on map] More 19 Sep 2021 01:41:51 GMT(10 hours after quake) 3.856 km Southern Sumatra, Indonesia [Show on map] More 19 Sep 2021 09:44:05 GMT(18 hours after quake) 3.310 km Northern Sumatra, Indonesia [Show on map] More 19 Sep 2021 12:34:05 GMT(21 hours after quake) 3.2113 km Northern Sumatra, Indonesia [Show on map] More 19 Sep 2021 21:20:28 GMT(1 day 6 hours after quake) 4.310 km Southwest of Sumatra, Indonesia [Show on map] More 20 Sep 2021 02:10:55 GMT(1 day 11 hours after quake) 3.3187 km Southern Sumatra, Indonesia [Show on map] More 20 Sep 2021 11:48:54 GMT(1 day 20 hours after quake) 3.318 km Java, Indonesia [Show on map] More 20 Sep 2021 12:26:28 GMT(1 day 21 hours after quake) 4.514 km Southern Sumatra, Indonesia [Show on map] More 20 Sep 2021 15:10:35 GMT(1 day 24 hours after quake) 3.910 km Southwest of Sumatra, Indonesia [Show on map] More 21 Sep 2021 04:39:50 GMT(3 days after quake) 3.110 km Northern Sumatra, Indonesia [Show on map] More 21 Sep 2021 05:03:42 GMT(3 days after quake) 3.110 km Northern Sumatra, Indonesia [Show on map] More 21 Sep 2021 12:39:21 GMT(3 days after quake) 3.510 km Sunda Strait, Indonesia [Show on map] More 21 Sep 2021 12:58:36 GMT(3 days after quake) 3.510 km South of Java, Indonesia [Show on map] More 21 Sep 2021 12:58:46 GMT(3 days after quake) 3.220 km Java, Indonesia [Show on map] More
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