1. Seismology and Wave Physics, Institute of Geophysics, Department of Earth Sciences ETH Zürich Zürich Switzerland
2. Geophysics, Department of Earth and Environmental Sciences LMU Munich Munich Germany
3. Now at Observatório Sismológico Instituto de Geociências, Universidade de Brasília 70910900 Brasília DF Brasil
4. Department of Earth Sciences Utrecht University Utrecht The Netherlands