What caused the M6.3 earthquake west of Macquarie Island?

[davenn]

From my seismograph this morning
M 6.3 - west of Macquarie Island
2023-10-11 20:04:57 (UTC) 52.060°S 139.590°E 4.8 km depth
This is on the Australian - Antarctic Ridge boundary, South of Australia.

The 3rd and latest M6.3 from Afghanistan can also be seen further up the seismogram.
The P wave arriving at 01:10UTC.. The origin time of the quake was 00:41:56 UT meaning that it took
some 28 minutes for the P wave to travel from the quake focus to my location in Sydney

The other smaller event after the Afghanistan event was a M5.5 from the Balleny Isl. area, in the Pacific - Antarctic Ridge

 

[Drakkith]

Hey Dave. Not sure if I've asked this before, but how do you determine the origin of the earthquake? Do you determine it yourself or do you reference another source?

 

[Astronuc]

Hey Dave. Not sure if I've asked this before, but how do you determine the origin of the earthquake? Do you determine it yourself or do you reference another source?

There are numerous sources for locating earthquakes. The USGS is one of the major, if the major, sources.
https://earthquake.usgs.gov/earthquakes/eventpage/us6000lews/executive

M 6.3 - west of Macquarie Island​

• 2023-10-11 20:04:57 (UTC)
• 52.060°S 139.590°E
• 4.8 km depth

That's shallow!

 

[Baluncore]

That's shallow!

4.8 km certainly is shallow, the water depth there is 2.7 km.

That location is closer to me, than it is to Macquarie Is.

 

[DaveC426913]

Astronuc's name is ... Dave?

Excuse me while I repair to high dungeon to revise my worldview..

 

[Drakkith]

Astronuc's name is ... Dave?

No idea. I was talking to Davenn. Which I think I misread in my bleary-eyed state as Dave N.

 

[Baluncore]

Excuse me while I repair to high dungeon to revise my worldview..

As a place name, you should capitalise "High Dungeon".
Maybe you are in "high dudgeon" ?

 

[DaveC426913]

Maybe you are in "high dudgeon" ?

Clutching my...

Sorry. I digress.

 

[Astronuc]

Astronuc's name is ... Dave?

Excuse me while I repair to high dungeon to revise my worldview..

Drakkith's question was directed to davenn, the OP. I provided an answer.