Spatial distribution of earthquake potential along the Himalayan arc

To determine the spatial distribution of earthquake potential along the active Himalayan arc, we utilize GPS measurements and earthquake data. We derive horizontal velocity field and 2-D strain rates from a new set of 41 regional GPS stations along with 446 published velocities. We convert these str...

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Bibliographic Details
Published in:Tectonophysics 2020-09, Vol.791, p.228556, Article 228556
Main Authors: Sharma, Yogendra, Pasari, Sumanta, Ching, Kuo-En, Dikshit, Onkar, Kato, Teruyuki, Malik, Javed N., Chang, Chung-Pai, Yen, Jiun-Yee
Format: Article
Language:English
Subjects:
Crustal deformation
Deformation
Distribution
Earthquake data
Earthquake potential
Earthquakes
Geodetic strain rate
Geological hazards
Global positioning systems
GPS
GPS velocity
Hazard assessment
Himalaya
Moment deficit rate
Satellite navigation systems
Segments
Seismic activity
Seismic analysis
Seismic hazard
Spatial distribution
Strain rate
Tensors
Time dependence
Velocity distribution
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Summary:To determine the spatial distribution of earthquake potential along the active Himalayan arc, we utilize GPS measurements and earthquake data. We derive horizontal velocity field and 2-D strain rates from a new set of 41 regional GPS stations along with 446 published velocities. We convert these strain rate tensors to geodetic moment rate build-up within 24 contiguous segments and compare to the seismic moment rate release derived from a reassessed earthquake catalog of 900 years. The geodetic to seismic moment rate ratio, an indicator of stored strain energy, varies from below unity to more than 50 in different segments. The estimated geodetic moment rate ranges from 1.7 × 1018 Nm/yr to 10.2 × 1018 Nm/yr, whereas the seismic moment rate ranges from 3.7 × 1016 Nm/yr to 5.1 × 1019 Nm/yr. This variation between the geodetic and seismic moment rate corresponds to a moment deficit rate of ~1.15×1017 Nm/yr to 7.97 × 1018 Nm/yr along various segments of the study region. The above moment deficit rate provides an equivalent earthquake potential of magnitude 5.7 − 8.2 in different segments. Specifically, the higher earthquake potential (Mw≥8.0) corresponds to the segments in the central seismic gap and the northeast part of Himalaya, whereas the lower earthquake potential (Mw
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2020.228556