1. Geological Survey of Canada; Pacific Geoscience Centre; Sidney British Columbia Canada
2. School of Earth and Ocean Sciences; University of Victoria; Victoria British Columbia Canada
3. Swiss Seismological Service; ETH Zurich; Zurich Switzerland
4. School of Geography, Environment, and Earth Sciences; Victoria University of Wellington; Wellington New Zealand
5. Department of Physics; University of Alberta; Edmonton Alberta Canada
6. Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
7. Department of Physics; University of Colorado Boulder; Boulder Colorado USA