

The Great Alberta Meteor Impact 
The seismic circle at 1600 km radius. The areas marked by the yellow arrows are enlarged to the right. 
Copper River 
The seismic circle at 2380 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 3295 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 4100 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 5060 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 6160 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 8290 km radius. 
The seismic circle at 9330 km radius along the Sala y Gomez Ridge in the eastern Pacific. 
The seismic circle at 9330 km radius through the Mediterranean Sea past Greece. 
The seismic circle at 11960 km radius past the Great Barrier Reef of northeastern Australia. 
The seismic circle at 11960 km radius past New Zealand. 
The seismic circle at 11960 km through the South Atlantic Ocean 
The seismic circle at 14960 km radius in the South Atlantic Ocean. 
The seismic circle at 14960 km radius in the Indian Ocean 
The seismic circle at 17770 and 18900 km radius. The areas marked by the yellow arrows are enlarged to the right. 
The seismic circle at 17770 km appears to be the cause of a large portion of the Southwest Indian Ridge. The seismic circle at 18900 km describes a major part of the Kerquelen Plateau. 
© 2015 Terry Westerman 