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Strongmotion seismograph results
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accelerograph records obtained Aftershock Aleutian Islands Angeles Subway Terminal April August awakened Basement accelerograph Boulder City Boulder Dam Bulletin chimneys cm/sec.2 and computed Coast and Geodetic computed maximum displacement Cracked plaster Damage slight December Depth about 100 Depth normal dishes rattled displacement meter doors earthquake Epicenter Ferndale floor accelerograph Francisco Southern Pacific frightened Geodetic Survey Gulf of California Hanging objects swung Helena Hollister Hollywood Storage house creaked Irregular waves January July June 18 Lake Light shock felt March Maximum acceleration Maximum intensity Mercalli Intensity Scale Mont Motion rapid Negative reports Nevada NORTHERN CALIFORNIA EARTHQUAKE November October October 21 Pendulum clocks Peru plaster cracked Possibly preceded preceded by stronger Rattled windows reports were received Rossi-Forel scale Santa Barbara Seismological September shock was felt South Southern California square miles stronger motion thirteenth floor Trees and bushes Valley Vertical walls creaked Washington Windows rattled