Issues

Front: The 3 September 2016 M_w 5.8 Pawnee earthquake, widely felt throughout Oklahoma and neighboring states, may be the largest injection-induced earthquake recorded to date. The cover figure depicts the slip distribution of the earthquake as derived from Grandin et al. (this issue), one of 10 original research papers presented here in an SRL focus section about the earthquake. The focus section provides a complete view of the stress evolution leading to the mainshock inferred from foreshock activities and coupled poro-elastic modeling; coseismic stress changes and deformations from both seismological and geodetic observations; dynamic hydrological responses at far-field; and liquefaction observations from geoelectrical and surface mapping.Back: The bottle shown here emerged shortly after the 18 October 1989 magnitude 7.1 Loma Prieta earthquake as earthwork was being done to repair liquefaction damage in San Francisco's Marina District. Research reported by Hinzen et al. (this issue) indicates that it is an 8-ounce soda bottle from the Charles Belding Company, and several signs indicate that the bottle pre-dates the 1906 San Francisco earthquake. The location where the bottle was found suggests that it was among rubble from the 1906 earthquake used as artificial fill in the area before the 1914 Panama-Pacific International Exposition. This bottle probably survived two earthquakes 83 years apart.