The ISI was strongly excited on march 1 at its first rigid body mode (1.24Hz). Since L4Cs and GS13s have their resonance at 1Hz and T240 are fragile instruments, they may have been damaged during the intense shaking. The attached calibrated spectra shows that all geophones seem to be working properly. Spectra were measured with the ISI locked and unloaded (lower stages of the QUAD removed). Then motions measured by stage 1 (L4C, T240) and stage 2 (GS13) geophones are very close. CPSs seem to work too.