Mon Feb 16, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Jia, Lulu, Chen, Shi, Wang, Linhai, Lu, Hongyan, Liu, Mian, Xu, Weimin, He, Zhitang, Chen, Zhaohui, and Han, Jiancheng, 2026. New evidence from hybrid ground–based gravity observations of a regional gravity increase in southern Tibet before 2015. Tectonophysics, 925:231096, doi:10.1016/j.tecto.2026.231096.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026Tectp.92531096J,
author = {{Jia}, Lulu and {Chen}, Shi and {Wang}, Linhai and {Lu}, Hongyan and {Liu}, Mian and {Xu}, Weimin and {He}, Zhitang and {Chen}, Zhaohui and {Han}, Jiancheng},
title = "{New evidence from hybrid ground-based gravity observations of a regional gravity increase in southern Tibet before 2015}",
journal = {Tectonophysics},
keywords = {Nepal earthquake, Temporal gravity variation, Hybrid ground-based gravimetry, Surficial factors in gravity change},
year = 2026,
month = mar,
volume = {925},
eid = {231096},
pages = {231096},
abstract = "{The 2015 Mw 7.8 Nepal earthquake occurred in the Himalayan tectonic
belt, where the Indian Plate collides with the Tibetan Plateau.
High-precision ground gravimetry can be used to detect transient
deep mass changes before the earthquake but limited by sparse
absolute gravity stations and the effects of complex surficial
factors. In this study, we present new evidence from hybrid
terrestrial gravity measurements, carried out in southern Tibet
near the epicenter of the 2015 Nepal earthquake. Measurements
from 9 relative and 3 absolute gravity stations are integrated
using a novel adjustment method. The results confirm the
significant regional gravity increase before the 2015 Nepal
earthquake, with a rate of about or larger than 15
{\ensuremath{\mu}}Gal/yr (1 {\ensuremath{\mu}}Gal =
10$^{{\ensuremath{-}}8}$ m/s$^{2}$) at four stations during
2010─2013. We show that this gravity increase cannot be
explained by vertical ground motion and/or local hydrological
processes. Furthermore, due to inadequate spatial resolution,
the observed gravity change could not be detected by the Gravity
Recovery and Climate Experiment (GRACE) measurements. We suggest
that the gravity increase could be caused by preseismic strain
and mass (fluid) transfer in a broad seismogenic source region
north of the Main Frontal Thrust. Absolute gravity observations
show that the gravity increase stopped after the 2015 Nepal
earthquake. Our results contribute to the exploration of
possible precursors of large continental earthquakes and shed
light on the potential mechanisms of large earthquakes in the
Indo-Asian collision zone.}",
doi = {10.1016/j.tecto.2026.231096},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026Tectp.92531096J},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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