Yikes, it was a bit too late in my timezone, sorry. [1]: https://www.andrew.cmu.edu/user/shijiapa/documentations/Hotmobile2015_Footstep_project.pdf https://www

Yikes, it was a bit too late in my timezone, sorry. [1]: https://www.andrew.cmu.edu/user/shijiapa/documentations/Hotmobile2015_Footstep_project.pdf https://www.andrew.cmu.edu/user/shijiapa/documentations/Hotm... [2]: https://en.wikipedia.org/wiki/Geophone https://en.wikipedia.org/wiki/Geophone