Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Map of Barnett Shale area as in Fig. 1, showing earthquakes located in this study (red circles) and injection wells in use since 2006 (squares and + symbols). Yellow squares are wells reporting maximum monthly injection rates exceeding 150,000 BWPM (24,000 m3/mo); white squares, exceeding 15,000 BWPM (2,400 m3/mo); + symbols, exceeding 1,500 BWPM (240 m3/mo).
