I believe that they figured that eruption in 10 minutes, put more into the air than the entire world does in 3 years. And it went on for how long?
I think that eruption went on for weeks.
An ancillary effect was that we abandoned Clark Air Base in the Philippines. As I recall, lease negotiations were happening at that time to extend our lease on that base, and on Subic Bay. I think it was decided that there was so much damage at Clark that there was no point in trying to do a lease and also repair and clean up the volcano damage.