South Alaskan Coastline is Earthquake prone - E.G. Magnitude 9.2 earthquake of 28 March 1964 - See Savage and Plafker, JGR,96(B3), 4325-4335, 1991
Documentation added 2011-11-24
Using information from the NOAA website the RLR diagram has been revised.Former Primary benchmark BM 13 10.458m relative to gauge datum on NOAA is NO 13 1964 with a value of 10.438m in the 1999 report and 10.432m in the 2011 report. Primary benchmark is now BM 19 1967 11.272m relative to gauge datum. This benchmark has the value 11.272m in both reports and also appears on the original RLR diagram as a secondary benchmark.
Documentation added 2017-02-07
The complete dataset for Seldovia has been revised by NOAA. A foot note at the base of the Bench Mark information refers to certain areas experiencing rapid land movement due to uplift or subsidence.