Source parameters of the 1957 Aleutian and 1938 Alaskan earthquakes from tsunami waveforms

Tsunami wave simulation is necessary in order to estimate wave at different points along the coast. There is a proposal to use the tsunami records at several points near the sources to estimate the wave generation function E (t) and to simulate the forecasting wave by getting the convolution of E (t) with pulse function of wave propagation P (t). For estimations of E (t) and P (t) it is proposed to use the sign methods, which permits to calculate these values by using the tide gauges records. We calculate the source funtion E (t) and pulse funtions P (t) for two large scale earthquakes in the Japan Sea (Niigata, 1964 and Akita, 1983) in several points of Japan sea coast. Using these results we have examined the quality of simulating by comparing the simulated waves with real record (AU)

Alaskan tsunamis revisited

The study of Alaskan tsunamis presents a number of problems. The first European visitorsand settlers were Russian fur traders first arriving in 1741, and the written record for more than the first century is mainly in old style Russian scrip. A sparce population, particularly in the highly activeAleutian islands, continues to the present day. There are tecttonically - generated tsunamis predominantly from the Aleutian Arc and Alaskan Peninzula, at least one volcanic tsunami from a landslide from an erupting volcano, and, most important locally, subaerial and submarine landslide tsunamis from the Prince William Sound and southeastern Alaska. The latter are related to the glacial topography and have caused most of the fatalities and damage. They are usually associated with a single bay and occur almost immediately after the triggering earthquake, posing severe problems for warnings and evasive actions. Teletsunamis have historically not been a significant problem (AU)

Koyukuk River flood recovery and mitigation : Relocation and floodproofing achieved by flood depth analysis, erosion analysis, and site suitability analysis

Two vigorous weather systems during the second half of August 1994 brought in deep levels of moisture out of the Bering Sea to northwest Alaska. With each system, strong northwesterly flow caused heavy precipitation, first as the warm moist air was brought in over the existing cold air, and again in advance of the passage of the cold front. Rain was heaviest on west- and southwest-facing slopes, enhanced by the terrain upslope. Due to the southwest-northeast orientation of the Koyukuk River basin, it was hit especially hard by these rains