... A total of 108 tsunamis caused by earthquakes and 298 shallow earthquakes with magnitude Ms 6.5 occurred in the region. ... Approximately 81% of tsunamis and 80% of shallow earthquakes occurred in Eastern Indonesia ­ i.e. the region east of 118o E ­ where tectonics show a more complicated pattern than the region in the west. ... A total of 108 tsunamis caused by earthquake and 298 shallow earthquakes (depth < 100 km; Ms 6.5) occurred in the Indonesian region during the period from 1901 to 2000. ...