Triggered Seismic Events along the Eastern Denali Fault in Northwest Canada Following the 2012 Mw 7.8 Haida Gwaii, 2013 Mw 7.5 Craig, and Two Mw>8.5 Teleseismic Earthquakes

Researchers identified long-duration, tremor-like seismic signals triggered along the eastern Denali Fault (EDF) in northwest Canada following significant distant earthquakes. Specifically, the 2012 Mw 7.8 Haida Gwaii and 2013 Mw 7.5 Craig earthquakes induced these tremors near the southeastern EDF, coinciding with peak transverse velocities—suggesting Love-wave triggering on right-lateral strike-slip faults. Additionally, short-duration bursts were repeatedly triggered by Rayleigh waves from the Haida Gwaii earthquake, potentially originating near Klutlan Glacier or a belt of shallow historical seismicity in the Wrangell–St. Elias mountain range. These findings highlight distinct seismic response mechanisms in intraplate regions compared to plate boundaries.

Aiken, C., Zimmerman, J. P., Peng, Z., & Walter, J. I. (2015). Triggered Seismic Events along the Eastern Denali Fault in Northwest Canada Following the 2012 Mw 7.8 Haida Gwaii, 2013 Mw 7.5 Craig, and Two Mw>8.5 Teleseismic Earthquakes. Bulletin of the Seismological Society of America, 105(2B), 1165–1177. https://doi.org/10.1785/0120140156