The pressure of the compressing Pacific was what caused the Tonga volcano to blow, and the tsunami buoys then went on alert as minor tsunami finally arrived in Peru, Chile, California, Japan, and Hawaii. It was not the Tonga volcano that originally caused the Pacific buoys to go on alert in the northern Pacific, but rather that the Tonga eruption was in response to the Pacific compression.
Tonga was a reaction, not a cause.
ZetaTalk Comment 1/31/2022: After years of being in a tightening bow, the N American Plate wants to straighten out. This action is what ultimately causes the New Madrid Adjustment, because the SE Portion of the N American Plate does not want to budge. Thus, as the Mainland Portion slides to the SW to allow the bow to relax, land from the tip of Mexico up along the New Madrid Fault Line pulls to the SW, causing the New Madrid rupture. This continuous push to slide to the SW puts pressure on the Pacific plates.
The Pacific is continually compressing while the Atlantic spreads - all part of the Pangea adjustments. Where the Pacific normally compresses in spates, here and there, with the pressure from the N American Plate pushing into the Pacific from the Aleutians down to the tip of Mexico, the adjustment on January 14 was broad in scope. From the Aleutians down past Japan and the collapsing Mariana and Philippine plates to the rising end of the Indo-Australian Plates the buoys went on alert. That Tonga erupted is no surprise.
Now the Mainland Portion has room to straighten out its bow. This action happened on January 15, with the Mainland Portion of the N American Plate starting to push into the Pacific. The SE Portion of N America, still reluctant to rip along the New Madrid Fault Line, attempted to slide to the SW with the Mainland Portion, tugging the Caribbean and S America Plates with it. This is a familiar battle in nature, where the strongest will preva
il. But the slide of the massive Mainland Portion will prevail because the New Madrid Fault line has been weakened.