Abstract
Two earthquakes occurred in 1993 off southern Kamchatka. They have similar surface wave magnitudes, focal mechanisms, and depths, but have distinctly different characteristics. The November earthquake is a standard or “impulsive”M7 underthrusting event. The June earthquake is a tsunamigenic or “low-stress-drop” event with several unusual characteristics, including a large, diffuse aftershock zone, directivity, and a long source time function. The 1993 earthquakes ruptured a segment of the Kamchatka Arc which has not ruptured since 1904. The 1993 earthquakes seem to signal the midpoint in the southern Kamchatka seismic cycle.
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Johnson, J.M., Tanioka, Y., Satake, K. et al. Two 1993 Kamchatka earthquakes. PAGEOPH 144, 633–647 (1995). https://doi.org/10.1007/BF00874387
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DOI: https://doi.org/10.1007/BF00874387