Clockwise rotation of the Philippines Sea. Halmahera is located in Eastern Indonesia on the Southwest corner of the Philippine Sea Plate. It has evidence of arc volcanism. The arc has shifted upwards.
References
Robert Hall, (1987), 'Plate boundary evolution in the Halmahera region, Indonesia' https://www.sciencedirect.com/science/article/abs/pii/0040195187903015
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