We saw that in between the sixth and seventh events in any of the three series of judgments in Revelation, there was an interval period. The interval period usually has to do with events of a spiritual nature, rather than merely natural or political. We have already discussed the first interval period between the sixth and seventh seals. Now as we begin Rev 10, we are coming to the interval period between the sixth and seventh trumpets.
“It [the vision of Rev chapter 10] occupies an important interval between the events which were to occur under the sixth trumpet, and the last scene—the final overthrow of the formidable power which had opposed the reign of God on the earth…”
Albert Barnes, Notes on .… Revelation, pg. 279.