# Séisme très faible mag. 2.7 - Mer de Sulu, 39 km au nord-ouest de Sipalay, Philippines, dimanche, 17 oct. 2021 02:59 (GMT +8) - writeAge(1634410740)

Quakes around its antipode during the following 3 jours
Check different time intervals: 24 hours | 2 days
Date & heure: 16 Oct 2021 18:59:00 UTC -
Heure locale à l'épicentre: dimanche, 17 oct. 2021 02:59 (GMT +8)
Magnitude: 2.7
Profondeur: 10 km
Épicentre latitude / longitude: 9.92°N / 122.09°E (Mer de Sulu, Philippines)
Antipode latitude / longitude: 9.92°S / 57.91°W (Brésil)
Source de données principale: PHIVOLCS (Philippine Institute of Volcanology and Seismology)
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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 quakes during preceding intervals of 3 jours with a standard deviation (σ) of 0.4, calculated by analzing all 100 preceding intervals of 3 jours for the same region.
Interpretation:
Note: At a magnitude of 2.7, 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 n/a 5+ 0 0 0 n/a 4+ 1 0 0.1 1 (9.9σ) 3+ 3 0 0.3 3 (9.9σ) Total 4 0 0.4 4 (9.9σ)
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 19 Oct 2021 11:31:07 GMT(3 jours after quake) 3.631 km OFFSHORE VALPARAISO, CHILE [Show on map] Plus 19 Oct 2021 15:43:41 GMT(3 jours after quake) 3.119 km Peru: OFF COAST OF TARAPACA, CHILE [Show on map] Plus 19 Oct 2021 17:35:28 GMT(3 jours after quake) 3.032 km CORDOBA (Argentina) [Show on map] Plus 19 Oct 2021 18:37:55 GMT(3 jours after quake) 4.720 km OFFSHORE ATACAMA, CHILE [Show on map] Plus
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