Many earthquakes shake Tokara Islands, with 12 Mag 4.5+

[Astronuc]

M 5.1 - 106 km N of Naze, Japan
https://earthquake.usgs.gov/earthquakes/eventpage/us6000e0zk/executive

• 2021-04-12 14:01:47 (UTC)
• 29.326°N 129.480°E
• 10.0 km depth

A small swarm or cluster of M4+, M5+ earthquakes north of Amami Ōshima, Japan, and seemingly close to Toshima,
5.1 Mag 106 km N of Naze, Japan
2021-04-12 07:01:47 (UTC-07:00) 10.0 km
4.7 Mag 107 km N of Naze, Japan
2021-04-11 05:14:21 (UTC-07:00) 59.0 km
4.8 Mag 108 km N of Naze, Japan
2021-04-11 05:00:26 (UTC-07:00) 30.8 km
4.5 Mag 115 km WSW of Kurio, Japan
2021-04-11 03:01:24 (UTC-07:00) 61.7 km
4.7 Mag 87 km N of Naze, Japan
2021-04-10 16:00:21 (UTC-07:00) 10.0 km
4.8 Mag 116 km WSW of Kurio, Japan
2021-04-10 13:40:44 (UTC-07:00) 25.7 km
4.8 Mag Ryukyu Islands, Japan
2021-04-10 13:20:38 (UTC-07:00) 10.0 km
4.7 Mag 102 km N of Naze, Japan
2021-04-10 11:18:14 (UTC-07:00) 10.0 km
4.9 Mag 118 km N of Naze, Japan
2021-04-10 06:10:42 (UTC-07:00) 33.9 km
5.2 Mag 99 km N of Naze, Japan
2021-04-10 00:36:28 (UTC-07:00) 35.0 km
5.1 Mag 94 km NNE of Naze, Japan
2021-04-09 23:52:12 (UTC-07:00) 35.0 km
5.3 Mag 102 km N of Naze, Japan
2021-04-09 15:07:30 (UTC-07:00) 12.6 km

There are many more < Mag 4.
Hundreds of earthquakes shake Tokara Islands
https://www3.nhk.or.jp/nhkworld/en/news/20210412_08/

 

[davenn]

A small swarm or cluster of M4+, M5+ earthquakes north of Amami Ōshima, Japan, and seemingly close to Toshima,

maybe a prelude to an undersea eruption ?

that would be cool

 

[Astronuc]

maybe a prelude to an undersea eruption ?

That's what I'm wondering. On the other hand, it could be related to the current activity of Suwanose-jima
https://www.volcanodiscovery.com/suwanosejima.html

The cluster of earthquakes is closer to dormant Akuseki-jima
https://www.volcanodiscovery.com/akuseki-jima.html

Then again, could this be a new volcanic island in the making?

Edit/update: https://en.wikipedia.org/wiki/Ryukyu_Trench