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