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Title: An improved geodetic source model for the 1999 M W 6.3 Chamoli earthquake, India

Abstract

Here, we introduce a distributed slip model for the 1999 M W 6.3 Chamoli earthquake of north India using interferometric synthetic aperture radar (InSAR) data from both ascending and descending orbits and Bayesian estimation of confidence levels and trade-offs of the model geometry parameters. The results of fault-slip inversion in an elastic half-space show that the earthquake ruptured a |$$9 _{ - 2.2}^{\circ + 3.4}$$| northeast-dipping plane with a maximum slip of ~1 m. The fault plane is located at a depth of ~|$$15.9_{ - 3.0}^{ + 1.1}$$| and is ~120 km north of the Main Frontal Thrust, implying that the rupture plane was on the northernmost detachment near the mid-crustal ramp of the Main Himalayan Thrust. The InSAR-determined moment is 3.35 × 10 18 Nm with a shear modulus of 30 GPa, equivalent to M W 6.3, which is smaller than the seismic moment estimates of M W 6.4-6.6. Possible reasons for this discrepancy include the trade-off between moment and depth, uncertainties in seismic moment tensor components for shallow dip-slip earthquakes and the role of earth structure models in the inversions. The released seismic energy from recent earthquakes in the Garhwal region is far less than the accumulated strain energy since the 1803 M S 7.5 earthquake, indicating substantial hazard of future great earthquakes.

Authors:
 [1];  [2];  [3]
  1. Univ. of California, Berkeley, CA (United States); Central South Univ., Changsha, Hunan (China)
  2. Univ. of California, Berkeley, CA (United States)
  3. Central South Univ., Changsha, Hunan (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1579920
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Volume: 205; Journal Issue: 1; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Radar interferometry; Earthquake source observations; Crustal structure; Asia

Citation Formats

Xu, Wenbin, Bürgmann, Roland, and Li, Zhiwei. An improved geodetic source model for the 1999 MW 6.3 Chamoli earthquake, India. United States: N. p., 2016. Web. doi:10.1093/gji/ggw016.
Xu, Wenbin, Bürgmann, Roland, & Li, Zhiwei. An improved geodetic source model for the 1999 MW 6.3 Chamoli earthquake, India. United States. doi:10.1093/gji/ggw016.
Xu, Wenbin, Bürgmann, Roland, and Li, Zhiwei. Tue . "An improved geodetic source model for the 1999 MW 6.3 Chamoli earthquake, India". United States. doi:10.1093/gji/ggw016. https://www.osti.gov/servlets/purl/1579920.
@article{osti_1579920,
title = {An improved geodetic source model for the 1999 MW 6.3 Chamoli earthquake, India},
author = {Xu, Wenbin and Bürgmann, Roland and Li, Zhiwei},
abstractNote = {Here, we introduce a distributed slip model for the 1999 MW 6.3 Chamoli earthquake of north India using interferometric synthetic aperture radar (InSAR) data from both ascending and descending orbits and Bayesian estimation of confidence levels and trade-offs of the model geometry parameters. The results of fault-slip inversion in an elastic half-space show that the earthquake ruptured a |$9 _{ - 2.2}^{\circ + 3.4}$| northeast-dipping plane with a maximum slip of ~1 m. The fault plane is located at a depth of ~|$15.9_{ - 3.0}^{ + 1.1}$| and is ~120 km north of the Main Frontal Thrust, implying that the rupture plane was on the northernmost detachment near the mid-crustal ramp of the Main Himalayan Thrust. The InSAR-determined moment is 3.35 × 1018 Nm with a shear modulus of 30 GPa, equivalent to MW 6.3, which is smaller than the seismic moment estimates of MW 6.4-6.6. Possible reasons for this discrepancy include the trade-off between moment and depth, uncertainties in seismic moment tensor components for shallow dip-slip earthquakes and the role of earth structure models in the inversions. The released seismic energy from recent earthquakes in the Garhwal region is far less than the accumulated strain energy since the 1803 MS 7.5 earthquake, indicating substantial hazard of future great earthquakes.},
doi = {10.1093/gji/ggw016},
journal = {Geophysical Journal International},
number = 1,
volume = 205,
place = {United States},
year = {2016},
month = {2}
}

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