The San Fernando earthquake was the first in a series ( dextral faults.
2.
The main WNW-ESE structures are the dextral faults of Lagoa do Capit�o and Topo, that merge to the east, forming a narrow shallow graben ( or trench ).
3.
The northern part of the Dolores-Guayaquil Megashear forms part of the dextral fault systems while in the south the megashear runs along the suture between the accreted tectonic blocks and the rest of South America.
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