MODIFIED MERCALLI INTENSITY VALUE IV
{short description of image} Full Description: Hanging objects swing. Vibration like passing of heavy trucks; or sensation of a jolt like a heavy ball striking the walls. Standing motor cars rock. Windows, dishes, doors rattle. Glasses clink. Crockery clashes. In the upper range of IV, wooden walls and frame creak.

Full descriptions are from: Richter, C.F., 1958. Elementary Seismology. W.H. Freeman and Company, San Francisco, pp. 135-149; 650-653.

 


Artwork is courtesy of the Campagna Mulitmediale di Informazione of the Osservatorio Geofisico Sperimentale in Italy ("Italia"). Molto gracie.

jbp 9/18/03