Coda wave attenuation in the Parecis Basin, Amazon Craton, Brazil: sensitivity to basement depth

Basement depths in the Parecis Basin (Amazon) with receiver functions from small local earthquakes in the Porto dos Gaúchos seismic zone

“…In March of 1998 and March of 2005, the two largest earthquakes in the seismic area of Porto dos Gaúchos were recorded: 5.2 m b and maximum Modified Mercalli (MM) intensity VI, and 5.0 m b and maximum intensity V (MM), respectively. Their aftershocks were studied with two University of Brasília (UnB) local seismographic networks (Barros et al, 2009, Barros et al, 2011. The first network of 10 stations (not all operating simultaneously) had an approximate diameter of 70 km and recorded over 2500 microearthquakes between March 1998 and December 2002.…”

“…Two magnitude 5 earthquakes have occurred in Porto dos Gaúchos, one in 1998 and the other in 2005, with aftershock sequences lasting for more than four years each. These two aftershock sequences were studied with local seismographic networks (Barros et al, 2011;Barros et al, 2009;Barros, 2010). This active area of the Parecis basin has been called the Porto do Gaú-chos Seismic Zone (PGSZ).…”