Relocations of Earthquakes (1899–1917) in South-Central Alaska |
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| Authors: | Diane I Doser |
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| Institution: | (1) Department of Geological Sciences, University of Texas at El Paso, El Paso, Texas, 79968, U.S.A |
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| Abstract: | I have relocated 18 earthquakes occurring in the south-central Alaska region between 1899 and 1917 using a bootstrap relocation
technique. Locations of events within the Yakutat region suggest that the 1899 sequence began on 4 September with a MS = 7.9 event within the area of the Pamplona fault zone/western Transition fault zone, rupturing the western portion of the
North American/Pacific plate interface. A MS = 7.4 event on 10 September appears to have ruptured the offshore portion of the plate interface to the east of the 4 September
event. This was followed by a MS = 8.0 event that likely ruptured the onshore and down-dip portion of the plate interface. A MS = 7.0 event in 1908 may have ruptured a small portion of the plate interface between the 4 September and 10 September events.
Events occurring between 1911 and 1916 in the Prince William Sound region appear to be slab events occurring in similar locations
to more recent seismicity. Within the Kodiak region the 1900 earthquake of MS = 7.7 has a location consistent with the rupture of the Kodiak asperity which also ruptured during the 1964 great Alaska
earthquake. Other large magnitude Kodiak events appear to be associated with regions of recent seismicity, including the Karluk
Lake area of southwestern Kodiak Island and the Albatross Basin located offshore southeast of Kodiak Island. Space-time seismicity
patterns since 1899 indicate that magnitude 6 to7 events have occurred with regularity in the Kodiak Island region; that there
has been a lack of magnitude ≥ 6 events in the Prince William Sound region since 1964, and that the Yakutat region has remained
notably quiescent at the magnitude ≥ 6 level. |
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| Keywords: | Historic earthquakes Alaska Yakutat Kodiak Prince William Sound |
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