not counting myself among catastrophiles, I suggest an alternative root for catastarian: In German there is Kataster for English cadaster, and under the latter word I found:

ca·das·tre also ca·das·ter (k-dstr). n.

A public record, survey, or map of the value, extent, and ownership of land as a basis of taxation.

[French from Provençal cadastro, from Italian catastro, alteration of Old Italian catastico, from Late Greek katastikhon, register: Greek kata-, by; see cata- + Greek stikhos, line; see steigh- in Indo-European Roots.]

So it would not take much coaxing to imagine catastarian as "being in charge of (or based on) a cadaster".