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Volume 12 Issue 3, March 2019

Shear deformation on a bilobate comet

The shape and internal structure of bilobate comet 67P is controlled by mechanically driven erosion of shear fracture networks, according to a three-dimensional analysis of images from the Rosetta mission. The image shows the Jupiter-family comet 67P/Churyumov–Gerasimenko.

See Matonti et al. and News & Views by Keane

Image: ESA/Rosetta/MPS for OSIRIS Team. MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA. Cover Design: Alex Wing.

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  • A magnitude 7.5 strike-slip earthquake that struck Palu, Indonesia, in 2018 unexpectedly generated a devastating tsunami. Seismic data reveal that its rupture propagated fast, at supershear speed. Whether the two are connected remains to be seen.

    • P. Martin Mai
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  • A chemically distinct region separates the Indian and Pacific mantle domains as revealed by isotope analyses on rare samples from the Australian–Antarctic Ridge.

    • Pamela D. Kempton
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