![]() PLEASE NOTE: Time-sensitive requests must be sent at least three weeks before the date they are needed. Date materials are needed by (if applicable).Indicate what purpose the materials will be serving.Full mailing address, including phone number, where the materials should be sent.Please list posters and one-pagers on separate lines. Names of item(s) you are requesting along with respective quantities.To request hardcopies of E&O materials, please send an email to: the following information: ![]() Modern research seismometers are electronic, and detect and record motions in all directions.Seismometers used in earthquake studies are highly sensitive to ground movements, so that movements as small as 1/10,000,000 centimeters (distances almost as small as atomic spacing) can be detected at very quiet sites.Seismographs operate on the principle of inertia.A seismograph is a device for measuring the movement of the earth, and consists of a ground- motion detection sensor, called a seismometer, coupled with a recording system.
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