AFTERSHOCKS

The epicenters and depth distribution of the 598 aftershocks recorded had magnitudes on the Richter Scale of 4.4 or greater as shown on the following diagram. Of these, the largest had a magnitude of 6.7, six were greater than 6.0, 127 were between 5.0 and 6.0, and the remainder were less than 5.0. During that same time period thousands of smaller ones were also recorded. All the aftershocks, 6.0 or greater were registered within the first several hours of the earthquake. The larger aftershocks (greater than or equal to 4.4) were concentrated mainly along a 600 mile belt that roughly parallels the continental margin. Only about 3% of the aftershocks with magnitudes greater than 4.4 were outside of the main belt of activity.

Aftershock Locations

Distribution and depth of aftershocks (4.4 <M>6.7) from March 27, to December 31, 1964

Reference Courtesy of The Alaska Earthquake, March 27, 1964, Regional Effects, Tectonics, U.S. Geological Survey Professional Paper 543-1

Table of Contents

Main

Abstract

Introduction

Time and Magnitude

Epicenter

Duration and Extent

Aftershocks

Deformation

Liquefaction
Tsunamis
References