Summary

We analyze and discuss the continuous seismic activity in the Dallas-Fort Worth (DFW) area. The event detection based on cross-correlation shows that the seismic activity has been continuous for more than two years after the salt water disposal injection ceased in August 2009. Continuous monitoring at the local station allows us to complete the catalog down to a magnitude of zero, providing more detailed information on seismicity in the DFW area. This seismic activity migrated in space from a cluster south-west of the well to a cluster located 2 km north-east of the well after May 2010. We show that the cross-correlation detection at the WMOK station is not able to detect both clusters of events without using multiple template events.

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