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accelerograph record aftershocks Alaska Alluvium Angeles Chamber Angeles Subway Terminal April Balboa Heights Basement accelerograph Berkeley Boulder Dam building bushes shaken Cape Mendocino Centro chimneys City clocks stopped Coast and Geodetic Damage slight December 24 Depth normal displacement earthquake East-west February Ferndale frightened Geodetic Survey Hanging objects swung Helena Hollister Hollywood Storage Honshu Island Huntington Beach Imperial Valley Imperial Valley earthquake January Japan July knickknacks fell Lake Light shock felt Long Beach March Maximum intensity Mercalli intensity scale Mexico Moderate shock Mont motion lasted Northeast November objects and furnishings October Pasadena Pendulum clocks plaster cracked Probable epicenter region reported felt residents awakened Rossi-Forel scale San Bernardino San Diego Santa seconds Seismological September Serial Slight damage Slight shock small objects moved Solomon Islands South Southeast Southern California southwest square miles strong-motion records strong-motion seismograph Subway Terminal building Trees and bushes Up-Down Vertical Walls creaked waves