MALLICK Rishav

I am interested in how the Earth's lithosphere deforms - be it elastically (recoverable deformation) or inelastically (permanent deformation). We don't know too well the relationships that govern how rocks respond (in terms of strains and strain rates) to an applied stress at the kilometre-scale, the scale that is relevant for most crustal hazards, and over most timescales. At the micro to meso scale, we have laboratory experiments that give us useful constitutive relationships. But as we move to larger scales, we rely on a few simple approximations - such as homogenous elasticity or linear viscoelasticity. These models work reasonably well when there is sparse data, but become less accurate as our spatial and temporal sampling improves. My work involves using laboratory-derived constitutive relations in numerical simulations of plate boundary shearing (subduction zones and strike-slip settings) and testing these against geodetic, seismological and geological observations from relevant settings to see how well the upscaling works. In some cases, it works quite well and that is really great but I am more interested in when it does not - that is when we discover new and unexpected ways in which the Earth functions.

Professional Activities:

Mallick, R., Bürgmann, R., Johnson, K., & Hubbard, J. (2021). A unified framework for earthquake sequences and the growth of geological structure in fold-thrust belts. Journal of Geophysical Research: Solid Earth, 126, e2021JB022045. https://doi.org/10.1029/2021JB022045

Mallick, R., Meltzner, A. J., Tsang, L. L. H., Lindsey, E. O., Feng, L., and Hill, E. M. (2021); Long-lived shallow slow-slip events on the Sunda megathrust. Nature Geoscience. https://doi.org/10.1038/s41561-021-00727-y

Lindsey, E., Mallick, R., Hubbard, J., Bradley, K., Almeida, R., Moore, J. D. P., Burgmann, R., Hill, E. M. (2021); Slip rate deficit and earthquake potential on shallow megathrust. Nature Geoscience. https://dx.doi.org/10.1038/s41561-021-00736-x

Pan, Y., Hammond, W., Ding, H., Mallick, R., Jiang, W., Xu, X., Shum, C. K., Shen, W. (2021); GPS Imaging of vertical bedrock displacements: Quantification of two-dimensional vertical crustal deformation in China. Journal of Geophysical Research: Solid Earth. https://doi.org/10.1029/2020JB020951

Mallick, R., Hubbard, J. A., Lindsey, E. O., Bradley, K. E., Moore, J. D. P., Ahsan, A., Khorshed Alam, A. K. M., Hill, E. M. (2020). Subduction initiation and the rise of the Shillong Plateau. Earth and Planetary Science Letters, 543, 116351. https://doi.org/10.1016/j.epsl.2020.116351

Morgan, P. M., Feng, L., Meltzner, A. J., Mallick, R., & Hill, E. M. (2020). Diverse Slip Behavior of the Banyak Islands Subsegment of the Sunda Megathrust in Sumatra, Indonesia. Journal of Geophysical Research: Solid Earth, 125(11). https://doi.org/10.1029/2020JB020011

Bradley, K., Mallick, R., Andikagumi, H., Hubbard, J., Meilianda, E., Switzer, A., Du, N., Brocard, G., Alfian, D., Benazir, B., Feng, G., Yun, S., Majewski, J., Wei, S., & Hill. E.M. (2019). Earthquake-triggered 2018 Palu Valley landslides enabled by wet rice cultivation. Nature Geoscience https://doi.org/10.1038/s41561-019-0444-1

Mallick, R., Lindsey, E. O., Feng, L., Hubbard, J., Banerjee, P., & Hill, E. M. (2019). Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network. Journal of Geophysical Research: Solid Earth, 124. https://doi.org/10.1029/2018JB016480

Lindsey, E. O., Almeida, R., Mallick, R., Hubbard, J., Bradley, K., Tsang, L. L. H., et al. (2018). Structural Control on Downdip Locking Extent of the Himalayan Megathrust. Journal of Geophysical Research: Solid Earth, 123(6), 5265–5278. https://doi.org/10.1029/2018JB015868

Almeida, R., Lindsey, E. O., Bradley, K., Hubbard, J., Mallick, R., & Hill, E. M. (2018). Can the Up-Dip Limit of Frictional Locking on Megathrusts be Detected Geodetically? Quantifying the Effect of Stress Shadows on Near-Trench Coupling. Geophysical Research Letters. https://doi.org/10.1029/2018GL077785

Mallick, R., Parameswaran, R. M., & Rajendran, K. (2017). The 2005 and 2010 Earthquakes on the Sumatra–Andaman Trench: Evidence for Post‐2004 Megathrust Intraplate Rejuvenation. Bulletin of the Seismological Society of America, 107(3). https://doi.org/10.1785/0120160147

Mallick, R., & Rajendran, K. (2016). The 2014 M w 6.1 Bay of Bengal, Indian Ocean, Earthquake: A Possible Association with the 85° E Ridge. Bulletin of the Seismological Society of America, 106(2), 408–417. https://doi.org/10.1785/0120150308

Parameswaran, R. M., Natarajan, T., Rajendran, K., Rajendran, C. P., Mallick, R., Wood, M., & Lekhak, H. C. (2015). Seismotectonics of the April–May 2015 Nepal earthquakes: An assessment based on the aftershock patterns, surface effects and deformational characteristics. Journal of Asian Earth Sciences, 111, 161–174. https://doi.org/10.1016/j.jseaes.2015.07.030

Education:

2009-2013: National Institute of Technology Karnataka, Surathkal (India)
2013-2015: Indian Institute of Science, Bangalore
2016-present: Nanyang Technological University

Professional Activities:

Mallick, R., Bürgmann, R., Johnson, K., & Hubbard, J. (2021). A unified framework for earthquake sequences and the growth of geological structure in fold-thrust belts. Journal of Geophysical Research: Solid Earth, 126, e2021JB022045. https://doi.org/10.1029/2021JB022045

Mallick, R., Meltzner, A. J., Tsang, L. L. H., Lindsey, E. O., Feng, L., and Hill, E. M. (2021); Long-lived shallow slow-slip events on the Sunda megathrust. Nature Geoscience. https://doi.org/10.1038/s41561-021-00727-y

Lindsey, E., Mallick, R., Hubbard, J., Bradley, K., Almeida, R., Moore, J. D. P., Burgmann, R., Hill, E. M. (2021); Slip rate deficit and earthquake potential on shallow megathrust. Nature Geoscience. https://dx.doi.org/10.1038/s41561-021-00736-x

Pan, Y., Hammond, W., Ding, H., Mallick, R., Jiang, W., Xu, X., Shum, C. K., Shen, W. (2021); GPS Imaging of vertical bedrock displacements: Quantification of two-dimensional vertical crustal deformation in China. Journal of Geophysical Research: Solid Earth. https://doi.org/10.1029/2020JB020951

Mallick, R., Hubbard, J. A., Lindsey, E. O., Bradley, K. E., Moore, J. D. P., Ahsan, A., Khorshed Alam, A. K. M., Hill, E. M. (2020). Subduction initiation and the rise of the Shillong Plateau. Earth and Planetary Science Letters, 543, 116351. https://doi.org/10.1016/j.epsl.2020.116351

Morgan, P. M., Feng, L., Meltzner, A. J., Mallick, R., & Hill, E. M. (2020). Diverse Slip Behavior of the Banyak Islands Subsegment of the Sunda Megathrust in Sumatra, Indonesia. Journal of Geophysical Research: Solid Earth, 125(11). https://doi.org/10.1029/2020JB020011

Bradley, K., Mallick, R., Andikagumi, H., Hubbard, J., Meilianda, E., Switzer, A., Du, N., Brocard, G., Alfian, D., Benazir, B., Feng, G., Yun, S., Majewski, J., Wei, S., & Hill. E.M. (2019). Earthquake-triggered 2018 Palu Valley landslides enabled by wet rice cultivation. Nature Geoscience https://doi.org/10.1038/s41561-019-0444-1

Mallick, R., Lindsey, E. O., Feng, L., Hubbard, J., Banerjee, P., & Hill, E. M. (2019). Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network. Journal of Geophysical Research: Solid Earth, 124. https://doi.org/10.1029/2018JB016480

Lindsey, E. O., Almeida, R., Mallick, R., Hubbard, J., Bradley, K., Tsang, L. L. H., et al. (2018). Structural Control on Downdip Locking Extent of the Himalayan Megathrust. Journal of Geophysical Research: Solid Earth, 123(6), 5265–5278. https://doi.org/10.1029/2018JB015868

Almeida, R., Lindsey, E. O., Bradley, K., Hubbard, J., Mallick, R., & Hill, E. M. (2018). Can the Up-Dip Limit of Frictional Locking on Megathrusts be Detected Geodetically? Quantifying the Effect of Stress Shadows on Near-Trench Coupling. Geophysical Research Letters. https://doi.org/10.1029/2018GL077785

Mallick, R., Parameswaran, R. M., & Rajendran, K. (2017). The 2005 and 2010 Earthquakes on the Sumatra–Andaman Trench: Evidence for Post‐2004 Megathrust Intraplate Rejuvenation. Bulletin of the Seismological Society of America, 107(3). https://doi.org/10.1785/0120160147

Mallick, R., & Rajendran, K. (2016). The 2014 M w 6.1 Bay of Bengal, Indian Ocean, Earthquake: A Possible Association with the 85° E Ridge. Bulletin of the Seismological Society of America, 106(2), 408–417. https://doi.org/10.1785/0120150308

Parameswaran, R. M., Natarajan, T., Rajendran, K., Rajendran, C. P., Mallick, R., Wood, M., & Lekhak, H. C. (2015). Seismotectonics of the April–May 2015 Nepal earthquakes: An assessment based on the aftershock patterns, surface effects and deformational characteristics. Journal of Asian Earth Sciences, 111, 161–174. https://doi.org/10.1016/j.jseaes.2015.07.030