Seismicity of the United States, 1568-1989 (revised)

........................................................................................ . 1 Seismicity maps ............................................................................. 4 Introduction .................................................................................. . 1 Damage summaries ....................................................................... 4 AcknowledgIllents ........................................................................ .. 2 Explanation of tables..................................................................... 5 Magnitudes .................................................................................... . 2 Modified Mercalli intensity scale of 1931.................................... 6 Intensity, felt area, and isoseismal maps .................................. .. 3 References cited ............................................................................. 14