See here
Actually where were five moderate quakes in less than two hours:
· M 5.9; Kepulauan Mentawai region
· M 5.5; Kepulauan Mentawai region
· M 6.3; Kepulauan Mentawai region
· M 5.8; Kepulauan Mentawai region
· M 6.8; Kepulauan Mentawai region
http://indahnesia.com/earthquake.php
and I will move the topic to a more appropriate forum than Visum