Seasonal modulation of deep slow-slip and earthquakes on the Main Himalayan Thrust

Panda, Dibyashakti; Kundu, Bhaskar; Gahalaut, Vineet K.; Bürgmann, Roland; Jha, Birendra; Asaithambi, Renuhaa; Yadav, Rajeev Kumar; Vissa, Naresh Krishna; Bansal, Amit Kumar

doi:10.1038/s41467-018-06371-2

Title: Seasonal modulation of deep slow-slip and earthquakes on the Main Himalayan Thrust

Journal Article · 07 October 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-06371-2 · OSTI ID:1567134

^[1]; Kundu, Bhaskar ^[1]; Gahalaut, Vineet K. ^[2];

^[3]; Jha, Birendra ^[4]; Asaithambi, Renuhaa ^[4]; Yadav, Rajeev Kumar ^[5]; Vissa, Naresh Krishna ^[1]; Bansal, Amit Kumar ^[6]

National Institute of Technology (NIT), Rourkela (India)
National Centre for Seismology, New Delhi (India)
Univ. of California, Berkeley, CA (United States)
Univ. of South California, Los Angeles, CA (United States)
Indian Inst. of Technology, Kanpur (India)
CSIR-National Geophysical Research Inst., Hyderabad (India)

The interaction between seasonally-induced non-tectonic and tectonic deformation along the Himalayan plate boundary remains debated. Here, we propose that tectonic deformation along this plate boundary can be significantly influenced by the deformation induced by the non-tectonic hydrological loading cycles. We explore seasonal mass oscillations by continental water storage in Southeast Asia and Himalayan arc region using continuous Global Positioning System measurements and satellite data from the Gravity Recovery and Climate Experiment. We suggest that the substantially higher transient displacements above the base of the seismogenic zone indicate a role of changes in aseismic slip rate on the deep megathrust that may be controlled by seasonal hydrological loading. We invoke modulation of aseismic slip on the megathrust down-dip of the seismogenic zone due to a fault resonance process induced by the seasonal stress changes. This process modulates mid-crustal ramp associated micro-seismicity and influences the timing of Central Himalayan earthquakes.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1567134

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Seasonal variations of seismicity and geodetic strain in the Himalaya induced by surface hydrology Bettinelli, Pierre; Avouac, Jean-Philippe; Flouzat, Mireille Earth and Planetary Science Letters, Vol. 266, Issue 3-4 https://doi.org/10.1016/j.epsl.2007.11.021	journal	February 2008
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