Between 2003 and 2007, three scientific meetings were held under the “Rainbow in the Earth” banner in Oklahoma, U.S.A., California, U.S.A., and Scotland, U. K. The aim of the meetings was to bring together scientists from a diverse range of disciplines for a discussion around a common theme of scale and frequency dependence of geophysical properties.

The meetings have proven very successful, with attendees from academia and industry covering a full spectrum of topics, with an emphasis on exploration seismology and theoretical rock-physics modeling but including contributions on earthquake seismology, petroleum geology, and electromagnetic methods. This special section represents a selection of notable contributions to the first three meetings.

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