In 1994 the Commission on Practice (CoP) of the International Association of Seismology and Physics of the Earth's Interior (IASPEI) formed an international Working Group entrusted with the creation of a New Manual of Seismological Observatory Practice (NMSOP). Since that time the WG organized six open workshop sessions in conjunction with IASPEI and ESC assemblies, with oral and poster sessions as well as Internet presentations of the manual Web site under development. In total, 37 authors from nine countries have collaborated on the new manual. The Manual has been published in two volumes as a loose-leaf collection in two clamp...

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