Scripps has several groups working on seafloor geodesy and deformation studies. My contribution was to spend many years developing a long-baseline tiltmeter. Although funding for this project has dried up, we did succeed in building and deploying a working instrument, which could be replicated if necessary to study magma migration and eruptions in seafloor volcanos and mid-ocean ridges.
Anderson, G., S. Constable, H. Staudigel, and F.K. Wyatt, 1997: A seafloor long baseline tiltmeter, J. Geophys. Res., 102, pp. 20269-20285. View a copy of this paper on Greg Anderson's site
Tolstoy, M., S. Constable, J. Orcutt, H. Staudigel, F.K. Wyatt, and G. Anderson, 1998: Short and long baseline tiltmeter measurements on Axial Seamount, Juan de Fuca Ridge, Phys. Earth Planet. Int., 108, pp. 129-141. View a copy of this paper on Maya Tolstoy's site
Picture of anchor left on Axial Seamount