“…Some fjord-delta deposits are so near instability that they fail during greater than average low tides. Many of these steep slopes, with weak sediment that is susceptible to cyclic loading, fail seasonally or semi-continuously (Syvitski and Farrow, 1983;Prior et al, 1986). These already weak fjordhead delta slopes episodically fail and produce catastrophic effects, such as occurred in Valdez (Coulter and Migliaccio, 1966), Seward (Lemke, 1967) and Whittier (Kachadoorian, 1965) in the 1964 Alaska earthquake or in static failure events, such as occurred in Kitimat Arm, Canada (Prior et al, 1982a, b).…”