Daniel C Bowden¹, Michael Coughlin², Andreas Fichtner¹, Victor C Tsai³ and Jan Harms⁴, (1)ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Zurich, Switzerland, (2)California Institute of Technology, Physics, Pasadena, CA, United States, (3)Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (4)Gran Sasso Science Institute: L'Aquila, Astroparticle Physics, L'Aquila, Italy