OCR Text |
Show Frost and Quaker In the annual lists of earthquakes registered at the Harvard seismo-graphic seismo-graphic station occasional shocks occurring oc-curring in winter are noted as due to "frost cracks;" i. e., the sudden opening open-ing of fissures in the ground resulting from freezing. Professor Woodworth, director of the station, states that the late Professor Shaler, in one of his lectures, lec-tures, mentioned the occurrence of a sensible shock at Cambridge some forty years ago, which he traced to a crack in the frozen ground. An apparent appar-ent earthquake near Akron O., probably prob-ably due to a frost crack, was described de-scribed in the American Geologist, while another, which caused a mild panic at Attleboro, Mass., was reported in the Attleboro Sun of January 23, 1903. Professor Woodworth says that "this idea of frost cracks Is very widespread wide-spread in New England as an explanation explana-tion of many small shocks coming at a time when the frozen ground is known to have cracked onen." |