# Light mag. 3.5 earthquake - Philippine Sea, 142 km southeast of Mati, Philippines, on Wednesday, Oct 20, 2021 3:09 pm (GMT +8) - writeAge(1634713740)

Quakes around its antipode during the following 3 days
Check different time intervals: 24 hours | 2 days
Date & time: 20 Oct 2021 07:09:00 UTC -
Local time at epicenter: Wednesday, Oct 20, 2021 3:09 pm (GMT +8)
Magnitude: 3.5
Depth: 4 km
Epicenter latitude / longitude: 6.19°N / 127.25°E (Philippine Sea, Philippines)
Antipode latitude / longitude: 6.19°S / 52.75°W (Brazil)
Primary data source: PHIVOLCS (Philippine Institute of Volcanology and Seismology)
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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 31. This is compared to the average number of 0.07 quakes during preceding intervals of 3 days with a standard deviation (σ) of 3.2, calculated by analzing all 100 preceding intervals of 3 days for the same region.
Interpretation:
Note: At a magnitude of 3.5, 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 days.
 Mag class Total # Average σ Observed deviation 6+ 0 0 0 n/a 5+ 0 0 0 n/a 4+ 4 0 0.4 4 (9.9σ) 3+ 27 0.1 2.8 26.9 (9.6σ) Total 31 0.07 3.2 30.9 (9.7σ)
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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3.0+
4.0+
Showing quakes magnitude 3.0 or higher (total: 31).
 Date and time MagDepth Location Details 20 Oct 2021 09:20:40 GMT(2 hours and 12 minutes after quake) 3.1102 km TARAPACA, CHILE [Show on map] More 20 Oct 2021 10:10:33 GMT(3 hours after quake) 3.1194 km SALTA (Argentina) [Show on map] More 20 Oct 2021 14:12:46 GMT(7 hours after quake) 3.2181 km SALTA (Argentina) [Show on map] More 20 Oct 2021 17:59:50 GMT(11 hours after quake) 3.1116 km ANTOFAGASTA, CHILE [Show on map] More 20 Oct 2021 20:20:20 GMT(13 hours after quake) 3.181 km ANTOFAGASTA, CHILE [Show on map] More 20 Oct 2021 22:21:00 GMT(15 hours after quake) 3.335 km Venezuela: 4 Km Al Suroeste De Guiria [Show on map] More 20 Oct 2021 22:21:05 GMT(15 hours after quake) 3.60 km French Guiana: Oiapoque/AP [Show on map] More 21 Oct 2021 02:42:47 GMT(20 hours after quake) 3.1108 km TARAPACA, CHILE [Show on map] More 21 Oct 2021 03:29:00 GMT(20 hours after quake) 3.123 km Venezuela: 30 Km Al Norte De Barquisimeto [Show on map] More 21 Oct 2021 07:31:17 GMT(1 day 0 hours after quake) 3.1122 km ANTOFAGASTA, CHILE [Show on map] More 21 Oct 2021 10:01:50 GMT(1 day 3 hours after quake) 3.5102 km ANTOFAGASTA, CHILE [Show on map] More 21 Oct 2021 10:32:27 GMT(1 day 3 hours after quake) 3.2194 km SALTA (Argentina) [Show on map] More 21 Oct 2021 10:51:19 GMT(1 day 4 hours after quake) 3.333 km SALTA (Argentina) [Show on map] More 21 Oct 2021 10:57:27 GMT(1 day 4 hours after quake) 3.9221 km SALTA, ARGENTINA [Show on map] More 21 Oct 2021 14:17:55 GMT(1 day 7 hours after quake) 3.4120 km ANTOFAGASTA, CHILE [Show on map] More 21 Oct 2021 14:23:00 GMT(1 day 7 hours after quake) 3.01.3 km Venezuela: 31 Km Al Sureste De El Vigia [Show on map] More 21 Oct 2021 15:03:11 GMT(1 day 8 hours after quake) 3.10 km Brazil: Rifaina/SP [Show on map] More 21 Oct 2021 19:43:24 GMT(1 day 13 hours after quake) 3.3201 km SALTA (Argentina) [Show on map] More 21 Oct 2021 20:43:26 GMT(1 day 14 hours after quake) 3.6259 km POTOSI, BOLIVIA [Show on map] More 22 Oct 2021 01:24:42 GMT(1 day 18 hours after quake) 3.2115 km ANTOFAGASTA, CHILE [Show on map] More 22 Oct 2021 07:46:43 GMT(2 days after quake) 3.0109 km TARAPACA, CHILE [Show on map] More 22 Oct 2021 09:30:41 GMT(2 days after quake) 3.839 km OFFSHORE TARAPACA, CHILE [Show on map] More 22 Oct 2021 11:06:24 GMT(2 days after quake) 4.222 km Central Bolivia [Show on map] More 22 Oct 2021 11:14:49 GMT(2 days after quake) 4.4109 km ANTOFAGASTA, CHILE [Show on map] More 22 Oct 2021 18:06:25 GMT(2 days after quake) 4.2134 km CENTRAL PERU [Show on map] More 22 Oct 2021 19:39:53 GMT(3 days after quake) 3.4192 km POTOSI, BOLIVIA [Show on map] More 22 Oct 2021 22:40:43 GMT(3 days after quake) 3.1155 km SALTA (Argentina) [Show on map] More 23 Oct 2021 02:08:56 GMT(3 days after quake) 3.3201 km ANTOFAGASTA, CHILE [Show on map] More 23 Oct 2021 03:34:30 GMT(3 days after quake) 3.50 km Central Bolivia [Show on map] More 23 Oct 2021 04:14:13 GMT(3 days after quake) 3.912 km SOUTHERN PERU [Show on map] More 23 Oct 2021 04:20:41 GMT(3 days after quake) 4.011 km SOUTHERN PERU [Show on map] More
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