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Mag 6.0 and 5.4 Earthquakes, South Sandwich Islands, S. Atlantic

Thread starter Astronuc
Start date Mar 14, 2021

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The discussion centers on two significant earthquakes that occurred in the South Sandwich Islands region on March 14, 2021. The first was a magnitude 6.0 quake, followed shortly by a magnitude 5.4 quake, both at a depth of 10.0 km. This area is typically quiet, raising interest in the seismic activity. Additionally, there were two aftershocks recorded, measuring magnitudes 4.7 and 5.5. The conversation also touches on the availability of tensor data related to the main event, with a request for guidance on how to interpret this data.

Mar 14, 2021

#1

Astronuc

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I thought the 6.0 Mag was a one off, but then a 5.4 Mag happened.

M 6.0 - South Sandwich Islands region
https://earthquake.usgs.gov/earthquakes/eventpage/us7000dj9v/executive

2021-03-14 12:05:13 (UTC)
59.841°S 29.499°W
10.0 km depth

M 5.4 - South Sandwich Islands region
https://earthquake.usgs.gov/earthquakes/eventpage/us7000djam/executive

2021-03-14 13:35:32 (UTC)
59.530°S 29.746°W
10.0 km depth

This is a normally quiet area.

Earth sciences news on Phys.org

Mar 15, 2021

#2

fresh_42

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I have found this file for the main event (there has been 2 aftershocks M4.7 and M5.5):
https://geofon.gfz-potsdam.de/data/alerts/2021/gfz2021fcmd/mt.txt

Does anybody know how to read the tensor data?

Thread 'Mag 7.6 - 73 km ENE of Misawa, Japan, tsunami warning issued'

M 7.6 - 73 km ENE of Misawa, Japan https://earthquake.usgs.gov/earthquakes/eventpage/us6000rtdt/executive 2025-12-08 14:15:11 (UTC) 40.960°N 142.185°E 53.1 km depth It was however fairly deep (53.1 km depth) as compared to the Great Tohoku earthquake in which the sea floor was displaced. I don't believe a tsunami would be significant. https://earthquake.usgs.gov/earthquakes/eventpage/us6000rtdt/region-info

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