?url_ver=Z39.88-2004&rft_id=doi%3A10.1190%2Ftle34060618.1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Ellsworth%2C+William+L.&rft.aulast=Ellsworth&rft.aufirst=William+L.&rft.issue=6&rft.volume=34&rft.date=June+2015&rft.issn=1070-485X&rft.atitle=Increasing+seismicity+in+the+U.+S.+midcontinent%3A+Implications+for+earthquake+hazard&rft.title=The+Leading+Edge&rft.pages=618-626&rft.genre=article