Two 1993 Kamchatka earthquakes

• Published in: Pure and Applied Geophysics PAGEOPH
• Main Authors: Johnson, Jean M., Tanioka, Yuichiro, Satake, Kenji, Ruff, Larry J.
• Other Authors: Department of Geological Sciences, University of Michigan, 48109-1063, Ann Arbor, MI, USA, Ann Arbor
• Format: Article in Journal/Newspaper
• Language: English
• Published: Birkhäuser-Verlag; Birkhäuser Verlag 1995
• Subjects: Geosciences; Geophysics/Geodesy; Earthquake Parameters; Tsunamis; Earthquake Cycle; Physics; Atmospheric; Oceanic and Space Sciences; Science; Kamchatka
• Online Access: https://hdl.handle.net/2027.42/43211; https://doi.org/10.1007/BF00874387

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. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/43211/1/24_2004_Article_BF00874387.pdf