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Title: 3-D seismic structure of the source area of the 1993 Latur, India, earthquake and its implications for rupture nucleations
Authors: Mukhopadhyay, Sagarika
Mishra O.P.
Zhao D.
Kayal J.R.
Published in: Tectonophysics
Abstract: The Latur earthquake (Mw 6.1) of 29 September 1993 is a rare stable continental region (SCR) earthquake that occurred on a previously unknown blind fault. In this study, we determined detailed three-dimensional (3-D) P- and S-wave velocity (Vp, Vs) and Poisson's ratio (σ) structures by inverting the first P- and S-wave high-quality arrival time data from 142 aftershocks that were recorded by a network of temporary seismic stations. The source zone of the Latur earthquake shows strong lateral heterogeneities in Vp, Vs and σ structures, extending in a volume of about 90 × 90 ×15 km3. The mainshock occurred within, but near the boundary, of a low-Vp, high-Vs and low-σ zone. This suggests that the structural asperities at the mainshock hypocenter are associated with a partially fluid-saturated fractured rock in a previously unknown source zone with intersecting fault surfaces. This might have triggered the 1993 Latur mainshock and its aftershock sequence. Our results are in good agreement with other geophysical studies that suggest high conductivity and high concentration of radiogenic helium gas beneath the source zone of the Latur earthquake. Our study provides an additional evidence for the presence of fluid related anomaly at the hidden source zone of the Latur earthquake in the SCR and helps us understand the genesis of damaging earthquakes in the SCR of the world. © 2005 Elsevier B.V. All rights reserved.
Citation: Tectonophysics, 415: 1-16
Issue Date: 2006
Keywords: 3-D tomography
Latur earthquake
Poisson's ratio
Saturation rate
Stable continental region
ISSN: 401951
Author Scopus IDs: 35617607600
Author Affiliations: Mukhopadhyay, S., Department of Earth Sciences, IIT Roorkee, Roorkee-247667, India
Mishra, O.P., Geodynamics Research Center, Ehime University, Matsuyama-790-8577, Japan, Geological Survey of India, Kolkata-700016, India
Zhao, D., Geodynamics Research Center, Ehime University, Matsuyama-790-8577, Japan
Kayal, J.R., Geological Survey of India, Kolkata-700016, India
Funding Details: We are thankful to Indian Meteorological Department for providing the data. The present work was carried out while SM was visiting Geodynamic Research Center, Ehime University, Japan. The critical, thoughtful and constructive reviews by Dr. H. Negishi and an unknown reviewer helped us to improve the original manuscript. This work was partially supported by research grants (B-11440134, S-12002006) from Japan Society for the promotion of Science to D. Zhao. Japan Society for the Promotion of Science, JSPS
Corresponding Author: Mukhopadhyay, S.; Department of Earth Sciences, , Roorkee-247667, India; email:
Appears in Collections:Journal Publications [ES]

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