Recent deployments of IRIS PASSCAL instruments have revealed a range of new seismic signals associated with dynamical processes affecting Earth’s changing cryosphere. Shown here is a multiday seismogram and spectrogram of chaotic and harmonic iceberg tremor (MacAyeal et al., 2008. Seismic and hydroacoustic tremor generated by colliding icebergs, Journal of Geophysical Research, 113, F03011, doi:10.1029/2008JF001005) recorded on a floating seismograph deployed atop the b15a major fragment of giant antarctic iceberg B15, which calved from the Ross Ice Shelf in 2000. The seismogram reveals dynamic phenomenology of tidally-induced forcing aground, and eventual breakup, of the iceberg against prominent bathymetric features (250-m contour indicated on the accompanying MODIS satellite images) near Cape Adare, Victoria Land. (After Martin et al., 2010. Kinematic and seismic analysis of giant tabular iceberg breakup at Cape Adare, Antarctica. Journal of Geophysical Research, 115, b06311, doi:10.1029/2009Jb006700.</p>


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