The graben subsided 11 feet in response to 14 feet of horizontal movement. Before the earthquake, the sidewalk at left, which is in the graben, was at street level on the right. This earthquake is perhaps most similar in setting to the magnitude 6.8, 2001 Nisqually earthquake, which occurred near Seattle, and caused between 1 and 4 billion dollars in damages.Ĭollapse of Fourth Avenue near C Street, Anchorage, due to the great alaska earthquake of Mawhich caused a landslide. The earthquake was not related to movement of a fault near the Earth’s surface. This earthquake occurred in the Alaska-Aleutian subduction zone, on a fault within the subducting Pacific slab rather than on the shallower boundary between the Pacific and North American plates. USGS and other scientists cannot predict the exact time, location and magnitude of any specific earthquake. As of December 3rd, 15:00 UTC, 170 aftershocks of magnitude 3 or above have occurred since the mainshock, including a magnitude 5.7 aftershock at 17:35 UTC on November 30th, just 7 minutes after the magnitude 7.0 mainshock. USGS scientists know that there will be more aftershocks and some will be larger than others, but the aftershocks will decrease in frequency over time. Right now, aftershocks are at the forefront of discussion. The USGS is working closely with Alaskan state scientists and emergency managers. Many failures of engineered materials occurred on or adjacent to saturated lowlands filled with organic sediment, silt, or sand. Lateral spreading disruptured Vine Road near Wasilla.
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