USGS on Twitter: "Build your own model seismograph at home! What do you need? Find it all right here (PDF): https://t.co/39I2ZOLDlQ #earthquakes #education https://t.co/7XZAPuc9Mm" / Twitter
Build your own seismograph- Incorporated Research Institutions for Seismology
Build your own seismograph- Incorporated Research Institutions for Seismology