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I can only find 'mortally' to fit the unclued 13 down and can't relate that to the theme .... is there an alternative word I am unaware of ?

Gerba, yes. It's a proper noun, relates to measuring earthquakes

Gerba, no - it's a more technical term. I got it from browsing through Chambers - it begins Mer...

Thanks Malone, I have now found it.
34 across required a similar trawl through Chambers.
My Chambers is totally, spinally kaput: I used to get a new one every 18 months or so from the Speccie crossword comp but since their prize policy change, nada.