That all tracks - good additional comment.
> Speculation, from trained geologists
Probably about on par with speculation from trained geophysicists I'd warrant.
> Speculation, from trained geologists
Probably about on par with speculation from trained geophysicists I'd warrant.
Re "speculation, ...": my point being expertise, but based on background knowledge rather than close event-specific observations or measurements. Yes, geophysicists would be an equivalent level of expertise.