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Rapid changes in the electrical state of the 1999 Izmit earthquake rupture zone

Author

Listed:
  • Yoshimori Honkura

    (Volcanic Fluid Research Center, Tokyo Institute of Technology)

  • Naoto Oshiman

    (Disaster Prevention Research Institute, Kyoto University)

  • Masaki Matsushima

    (Tokyo Institute of Technology)

  • Şerif Barış

    (Kocaeli University)

  • Mustafa Kemal Tunçer

    (İstanbul University)

  • Sabri Bülent Tank

    (Kandilli Observatory and Earthquake Research Institute, Boğaziçi University)

  • Cengiz Çelik

    (Earthquake Hazard Mitigation Center, Kandilli Observatory and Earthquake Research Institute, Boğaziçi University)

  • Elif Tolak Çiftçi

    (Kandilli Observatory and Earthquake Research Institute, Boğaziçi University)

Abstract

Crustal fluids exist near fault zones, but their relation to the processes that generate earthquakes, including slow-slip events, is unclear. Fault-zone fluids are characterized by low electrical resistivity. Here we investigate the time-dependent crustal resistivity in the rupture area of the 1999 Mw 7.6 Izmit earthquake using electromagnetic data acquired at four sites before and after the earthquake. Most estimates of apparent resistivity in the frequency range of 0.05 to 2.0 Hz show abrupt co-seismic decreases on the order of tens of per cent. Data acquired at two sites 1 month after the Izmit earthquake indicate that the resistivity had already returned to pre-seismic levels. We interpret such changes as the pressure-induced transition between isolated and interconnected fluids. Some data show pre-seismic changes and this suggests that the transition is associated with foreshocks and slow-slip events before large earthquakes.

Suggested Citation

  • Yoshimori Honkura & Naoto Oshiman & Masaki Matsushima & Şerif Barış & Mustafa Kemal Tunçer & Sabri Bülent Tank & Cengiz Çelik & Elif Tolak Çiftçi, 2013. "Rapid changes in the electrical state of the 1999 Izmit earthquake rupture zone," Nature Communications, Nature, vol. 4(1), pages 1-10, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3116
    DOI: 10.1038/ncomms3116
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