In this lesson students will investigate the seismology and geological origins of the Hawaiian Islands to discover how scientists can obtain information on geological processes deep within the Earth. As a result of this activity, students will be able to explain the processes of plate tectonics and volcanism that formed the Hawaiian Islands and describe, compare, and contrast S waves and P waves. They will also learn how seismic data recorded at different locations can be used to determine the epicenter of an earthquake, and will infer a probable explanation for the existence of ultra-low velocity zones, and how these zones may be related to the Hawaiian hotspot. Educational levels: High school