Zeldris statement is completely irrelevant. It's based on what he feels it was gonna happen, not something he was certain of, and not something he showed knownledge about. Near Zeldris we can see buildings getting destroyed but not entirely, ground is intact, it just has violent shaking, some minor to average damage on buildings and that's about it.
Behemoth generating one earthquake where the epicenter has some fissures doesn't mean it's magnitude 9 or whatever, that's nearly world destruction and the on-screen visuals do not agree with that. Also, the epicenter is where the damage is the highest:
Berkeley Seismology Lab (USGS-affiliated): Scientists observed that the strongest shaking and the most damage were observed close to the rupture. The values of the MMI scale generally decrease as the distance from the epicenter increases.
USGS: The Modified Mercalli Intensity value assigned to a specific site after an earthquake has a more meaningful measure of severity to the nonscientist than the magnitude because intensity refers to the effects actually experienced at that place.
I've sat on this for about a week and some change and I'm willing to concede the magnitude 9 argument. There's just no viable enough evidence to push it as a definitive. What i do not agree on is the complete dismissal of the statement "tearing apart the demon realm" statement as it's used by the author to gauge the threat the behemoth poses with it's scream to the Demon Realm, hyping it up to be a world threatening crisis, which a magnitude 5 earthquake from what i know is not capable of. With that being said, I think Maginitude 6-7 is what i'm currently willing to argue as we see it damage buildings, Characters being unable to remain standing(Donny being thrown into the air as an example), fissures on the ground being formed during a similar rampage in the past etc. The only reason why further damage was not shown was due to the fact that Percival was able to put The Behemoth to bed before any further damages could have occured.
Anime doesn't have anything useful because we don't see its movement and the scene was cut, we don't know from when it started to move.
Well just because nothing is shown does not mean you can't get anything out of it.
In the manga, we see the behemoth
standing upright, causing the earthquakes and miasma spreading.
Then we have
Nasiens stating that the noise and miasma are fading away right after percival puts it to sleep, indicating that The Behemoth is currently going back to sleep and like a panel later we see it
asleep on the ground. So to reiterate, standing= noise and miasma and sleep= noise gone and no miasma, which all happened in about 3 panels in the manga.
If anything the anime prolongs this sequence due to the pacing of it
. So there's definitely a timeframe to be taken out of this.
Because it's not even a physical feat, it's energy being generated and spreading at a unknown timeframe that was assumed to be insanely quick. It has no means of scaling, that's not even a feat, it's just someone looking for anything to get high results.
How is it not a physical feat? The Negative energy is described as a Miasma so thick,
being able to obsctruct vision and is compared to ashes multiple times. It's also shown to push back the camelot knights and
is able to overwhelm nanashi's saintly coat. Spreading something like that across the demon realm is a feat.
I also have problems with the new gpe calc, I already expressed before in a previous response
the size of the albion being greatly misrepresented, but not only that in the calculation
the first panel used, you got the width of a strand of hair at 35.4m, but in the next panel the entire body length of the albion laid flat which is greater than >35.4m is nothing
but a spec compared to the widths of the hair shown. Also something I noticed in the panel. there's different size of strands of hair and in the first zoomed out panel you used in the calc is most likely the shorter hair strands that got translated to the general width used in the calc. We currently have an accepted height of the fat albion at 289m which is consistent with it being
not that much shorter than the lanky albion that's shown to be
taller than mountains
I did my own rough pixel scaling using the current accepeted height of fat albion