Most people do confuse King Earthquake & Earthquake Studio's TNT Roots. Yet they sound totaly diffrent. Still it is very understandable how you can mix them up because of the title "Earthquake".
Earthquake Studio's is run by Tony TnT and Winston Dread. They are no longer together even though they have been recently releasing cd's. As spoken there most recent cd is called Mighty King David Sounds. A year or so before that they released a cd called Yahweh Warriors "In Dubwize". Before that they released a old session they did with Tena Stelin called Cosmic Intervention.
The Tena Stelin album was released in 2005. The tracks where done many years ago with tena and Tony Tnt they both decided on a release. I highly recomend this one out of all the recent cd releases! Its a top of the line release from them.
Before that you saw Earthquake studios Revelations in dub vol 2 and 3 on Vinyl LP in shops. These I think where old presses that Jetstar had in overstock and handed to shops like Reggaemusicstore and Ebreggae etc..
There was of course Vol 1 or just called Earthquake Studio Revelation in dub. I found this one on ebay a few years ago for very cheap.
A few other albums that I know about that are not on the link you provided is as follows. Armagideon / Dub Harder than Steel / Raw Dub Infinity Most of these as far as I know where cd releases.
If you have any more questions just ask.