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  1. ↑ Milsom, J. (2003). Field Geophysics. The geological field guide series. 25. John Wiley and Sons. m/s. 232. ISBN 9780470843475. Dicapai 25 Februari 2010. 
  2. ↑ "Speed of Sound through the Earth". Hypertextbook.com. Dicapai 2011-12-14. 
  3. ↑ "Seismographs - Keeping Track of Earthquakes". Earthquake.usgs.gov. -27 Oktober 2009. Dicapai 14 Disember 2011.  Check date values in: |date= (bantuan)
  4. ↑ GR Helffrich & BJ Wood (2002). "The Earth's Mantle" (PDF). Nature. Macmillan Magazines. 412 (2 August): 501; Figure 1. doi:10.1038/35087500. 
  5. ↑ Justin L Rubinstein, DR Shelly & WL Ellsworth (2009). "Non-volcanic tremor: A window into the roots of fault zones". dalam S. Cloetingh, Jorg Negendank. New Frontiers in Integrated Solid Earth Sciences. Springer. m/s. 287 ff. ISBN 904812736X. The analysis of seismic waves provides a direct high-resolution means for studying the internal structure of the Earth... 
  6. ↑ CMR Fowler (2005). "§4.1 Waves through the Earth". The solid earth: an introduction to global geophysics (edisi 2nd). Cambridge University Press. m/s. 100. ISBN 0521584094. Seismology is the study of the passage of elastic waves through the Earth. It is arguably the most powerful method available for studying the structure of the interior of the Earth, especially the crust and mantle. 
  7. ↑ Lowrie, William (1997). The Fundamentals of Geophysics. Cambridge University Press. m/s. 149. 
  8. ↑ "Earthquake P-wave Pre-Detection and Disaster Mitigation Technology". 1999. 

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