seis·mo·graph ![](/application/resources/images/mini-speaker.png) (s īz m ə-gr ăf ′)
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n. An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.
seis·mogra·pher (sīz-mŏgrə-fər) n. seis′mo·graphic (-grăfĭk), seis′mo·graphi·cal (-ĭ-kəl) adj. seis·mogra·phy n. ![](/application/resources/arts/THseismograph.jpg) (click for a larger image) seismographdata relating to the 1994 earthquake in Northridge, California |