Sure, here it is: http://dragonage.wik...es_of_Segrummar
Specifically this part: "Terrible, to sacrifice one's own child with a lie. I preyed on perfectly trusting faith, but how could I explain my desperation? The Deep Roads wind in deceitful spirals, concealing the sigil from casual observance. I could not discern its true pattern until I stood in the Fade and gazed down upon the vast malevolent engraving. Its artist remains unknown, but its horrifying intent was all too clear - as was my necessity. I only wish it had not cost you, my only child. I could not build the locked barriers that would carve the marks and break the sigil. You alone could save us all, but only by destroying yourself. And I let you do it. Forgive me."
What is interesting is that someone indeed managed to break the sigil. I mean, the last note on the gates certainly implies that. Valta tells us that the Titan has stirred because of the Breach opening, but perhaps that particular Titan stirring (we don't hear of any other earthquakes anywhere else) was possible only because someone has either broke or weakened the sigil?
Whops I edited but now I see you've found it for me 
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I'll just post it here:
Interestingly, I don't think I noticed before but the person claimed it was able to be seen from the fade - they must not have been a Dwarf. Either it's very old (potentially pre-veil old where there could be a chance that Dwarves were different and could see or be a part of the Fade) or it was an Elf/Human/Qunari or something that had access to the Fade. And were in the Deep Roads of all places.
Oh and about the earthquakes, there have been some in Vol Dorma where it unearthed an Eluvian in an Elven ruin.
Map (it's rather close to Weisshaupt..) -
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You can download the sliders 
. I mean they didn't age drastically like: veil is down - everyone over 120 dies instantly. I wouldn't be surprised if Abelas and Solas are aging when they are out of uthenera.
