Structure Of The Earth : Earthquakes (1930s, silent)

Creator: A/V Geeks 16mm Films

Description: Email us at footage@avgeeks.com if you have questions about the footage and are interested in using it in your project. Introduction to Earth's Structure and Earthquakes 00:00:04 The segment opens with the title slide for "The Structure of the Earth," part of the Pathé Science Series, indicating a focus on geological concepts and phenomena like earthquakes. 00:00:50 A 1923 copyright notice from Pathe Exchange, Inc., approved by the National Board of Review, is displayed, suggesting the historical context and authenticity of the film's content. 00:02:14 The scene shifts to a landscape of destruction, illustrating the devastating aftermath of an earthquake with debris, damaged buildings, and bare trees. 00:08:11 - 00:12:59 Seismic Monitoring and Earth's Structure 00:08:11 The segment opens with a view of scientific instruments, likely for geology or seismology, set up in an educational or research context. 00:08:40 A method for recording ground movements is shown, involving a long boom that magnifies motion and inscribes it onto smoked paper on a revolving drum. 00:10:08 Earthquake vibrations are explained to travel through rock as "P," "S," and "L" waves, representing different types of seismic energy. 00:12:19 A diagram illustrates Earth's structure and seismic activity, displaying a seismograph reading and referencing Boston for monitoring. 00:12:59 - 00:17:00 Seismic Wave Analysis 00:12:59 Seismograph readings from St. Louis show varying wave patterns that indicate ground movement from an earthquake, aiding in the analysis of Earth's structure and earthquake dynamics. 00:13:13 The time intervals between different seismic waves are directly proportional to their distance from the earthquake's epicenter, a key principle in seismology. 00:14:08 A comparison of seismic records from St. Louis and Boston illustrates the timing of P, S, and L waves, with the St. Louis record showing a P to S wave interval corresponding to a 2000-mile distance.

Online Copy: https://www.youtube.com/watch?v=wpK0xyn5Z4w

Metadata Source:YouTube