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Even in absence of earthquakes, each site on earth experiences continuouselastic vibrations which are mostly traced to the non-linear interactions ofsea waves. However, the fine structure of the spectrum at mHz frequencies showshundreds of highly significant narrow bandwidth peaks, with a persistence and acoincidence with solar acoustic eigenmodes which are incompatible with anygeophysical origin. The feasibility of a common cosmic origin is evaluatedthrough an estimate of the gravitational wave cross-section of the earth,combined with its elastic response and with the stochastic amplificationproduced by the interference of the cosmic signal with tremor of oceanicorigin. The measured spectral peaks appear compatible with a gravitationalmonochromatic illumination at strains $h \gtrsim 10^{-20} $. We analize indetail the band around 2.614 mHz, where the binary white dwarf J0651+2844 -which is the second strongest known gravitational stellar source - is expectedto emit. Compatible spectral tremor peaks are found for both the earth and thesun, but their amplitude is 3 o.m. larger than independent estimates, so that agravitational source attribution would call for a variety of unknownnon-luminous sources with definite mass-distance ratios.

Cosmic signatures in earth's seismic tremor?