2034-03-11 1553EST Gravity Lance Dissipates
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Over just a few seconds, the gravity lance dissipated. The low-g field receded back out over the 1000km diameter circle over the next 10-12 minutes. The lance was over the Pacific when it stopped.
Gravity Lance Off
When the enormous gravitational force returned to normal around 1012Kg of atmosphere transitioned from a thin layer of supercritical fluid at the bottom of a deep trench to a normal gas. That mass of air would cause 30atm (3GPa) pressure if the air were in a normal column. In effect it exploded hard - and cold.
The exploding air blasted inward while expanding water rammed up. Together this caused about 0.5km3 of ocean to be ejected high up into the atmosphere. It partially shrouded the earth in clouds, causing significant drops in temperature.
The initial outward blast smashed out a crater roughly 25Km3. The echo of the inward blast propelled this material quite far.
Basically Krakatoa. The thunder was heard all around the world.
Barographs record the waves seven times over the course of five days: four times with the wave travelling away from the volcano to its antipodal point, and three times travelling back to the volcano. Ash was propelled to a height of 80 km (50 mi). The sound of the eruption was so loud it was reported that if anyone was within ten miles (16 km), they would have gone deaf. Of course no one that close survived.
The combined effects of ash and subsequent earthquakes had disastrous results in the region and worldwide. The death toll of the initial blasts is estimated at 3 million.
If there is a 'silver lining', the huge volume of dust is expected to lower average global temperatures are predicted by as much as 1°Celsius in the year following the eruption. Their won't last, but it may help reduce some of the effects of climate change for some time.