Earth Shaker: The following files are Earth Shaker in zipped Z80 file format which should work on most Spectrum emulators: Earthz80.zip, and "Earth Shaker old": Eartholdz80.zip. I also made a PC version of Earth Shaker in QBasic, which can be downloaded as an EXE file (zipped) here. Below is a screenshot:

Music: The following files are wave files (zipped) of all the game's music: Title screen music, Map music, Ending music, Game over music, Levels 1-4 music, Levels 5-8 music, Levels 9-12 music, Levels 13-16 music, Levels 17-20 music, Levels 21-24 music, Levels 25-28 music, Levels 29-32 music. I have also made two MIDI files (not zipped): Title screen music, Ending music. This file is an AY file of all music (zipped), download an AY player to hear it: earthay.zip.
Editor: Thanks to "Star Taymar" for e-mailing me this editor he made for Earth Shaker. It was published in Your Sinclair and is here in .tzx format along with copies of the pages of program listing.