The "USGS Earthquake Magnitude Policy" for reporting earthquake magnitudes to the public as formulated by the USGS Earthquake Magnitude Working Group was implemented January 18, 2002, and posted at https://earthquake.usgs.gov/aboutus/docs/020204mag_policy.php. It has since been removed; a copy is archived at the Wayback Machine, and the essential part can be found here.
See Bolt 1993 harvnb error: no target: CITEREFBolt1993 (help), Chapters 2 and 3, for a very readable explanation of these waves and their interpretation. J. R. Kayal's description of seismic waves can be found here.
Bormann, Wendt & Di Giacomo 2013, §3.2.4.4 harvnb error: no target: CITEREFBormannWendtDi_Giacomo2013 (help). The "g" subscript refers to the granitic layer through which Lg waves propagate.Chen & Pomeroy 1980, p. 4 harvnb error: no target: CITEREFChenPomeroy1980 (help). See also J. R. Kayal, "Seismic Waves and Earthquake Location", here, page 5.
earthquake.usgs.gov
The "USGS Earthquake Magnitude Policy" for reporting earthquake magnitudes to the public as formulated by the USGS Earthquake Magnitude Working Group was implemented January 18, 2002, and posted at https://earthquake.usgs.gov/aboutus/docs/020204mag_policy.php. It has since been removed; a copy is archived at the Wayback Machine, and the essential part can be found here.
The "USGS Earthquake Magnitude Policy" for reporting earthquake magnitudes to the public as formulated by the USGS Earthquake Magnitude Working Group was implemented January 18, 2002, and posted at https://earthquake.usgs.gov/aboutus/docs/020204mag_policy.php. It has since been removed; a copy is archived at the Wayback Machine, and the essential part can be found here.
