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Strong Motion Data Analysis of the 4 April 2011 Western Nepal Earthquake (M 5.7) and its Implications to the Seismic Hazard in the Central Himalaya


Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, India
 

In the present study, the strong motion data of the 4 April 2011 western Nepal earthquake (M 5.7) recorded by a dense network of 24 strong motion accelerograph stations have been used to estimate horizontal and vertical component of the peak ground acceleration (PGA) to better understand its bearing on the seismic hazard scenario of the Central Himalayan region. We assimilated attenuation curves using the observed PGA values and found that the zone is associated with higher H/V ratio in which the attenuation trend remains bimodal with one trend for closer distance up to 100-120 km, while the other trend corresponds to distances extending beyond 1000 km. We infer that the two different PGA trends have close bearing on the major tectonics and structural set-up of the region, which is possibly attributed to subsurface structural variation through which the seismic wave travels, suggesting changes of crustal heterogeneities beneath the source zone. The present work may improve the concept of ground motion model for evaluating seismic hazard for the Himalaya.

Keywords

Earthquakes, Peak Ground Acceleration, Seismic Hazard, Strong Motion Data.
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  • Bollinger, L., Perrier, F., Avouac, J. P., Sapkota, S., Gautam, U. and Tiwari D. R., Seasonal modulation of seismicity in the Himalaya of Nepal. Geophys. Res. Lett., 2007, 34, L08304.

  • Kumar, N., Paul, A., Mahajan, A. K., Yadav, D. K. and Bora, C., The Mw 5.0 Kharsali, Garhwal Himalayan earthquake of 23 July 2007: source characterization and tectonic implications. Curr. Sci., 2012, 102, 1674–1682.

  • Valdiya, K. S., Structural set-up of the Kumaun Lesser Himalaya – Colloqu Intern CNRS, 268, Ecologie et Geologie de l’Himalaya, Paris, 1976, pp. 449–462.

  • Upreti, B. N., An overview of the stratigraphy and tectonics of the Nepal Himalaya. J. Asian Earth Sci., 1999, 17, 577–606.

  • Hodges, K. V., Tectonics of the Himalaya and southern Tibet from two perspectives. Geol. Soc. Am. Bull., 2000, 112(3), 324–350.

  • Ni, J. and Barazangi, M., Seismotectonics of the Himalayan collision zone: geometry of under thrusting Indian Plate beneath the Himalaya. J. Geophys Res., 1984, 89, 1147–1163.

  • Bilham, R., Gaur, V. K. and Molnar P., Himalayan seismic hazard. Science, 2001, 293, 1442–1444.

  • Sapkota, S. N., Bollinger, L., Klinger, Y., Tapponnier, P., Gaudemer, Y. and Tiwari, D., Primary surface ruptures of the great Himalayan earthquakes in 1934 and 1255. Nature Geosci., 2013, 6, 71–76.

  • Mishra, O. P., Intricacies of the Himalayan seismotectonics and seismogenesis: need for integrated research. Curr. Sci., 2014, 106(2), 176–187.

  • Molnar, P. and Tapponnier, P., Active tectonics of Tibet. J. Geophys. Res., 1978, 83, 5361–5375.

  • Gitis, V., Yurkov, E., Arora, B. R., Chabak, S., Kumar, N. and Baidya, P., Analysis of seismicity in North India. Russ. J. Earth Sci., 2008, 10, 1-11 ES5002; doi: 10.2205/2008ES000303

  • Molnar, P. and Lyon-Caen, H., Fault plane solutions of earthquakes and active tectonics of the Tibetan Plateau and its margins. Geophys. J. Int., 1989, 99, 123–153.

  • Gahalaut, K. and Rao, N. P., Stress field in the western Himalaya with special reference to the 8 October 2005 Muzaffarabad earthquake. J. Seismol., 2009, 13, 371–378.

  • Paudiyal, H., Shanker, D., Singh, H. N., Panthi, A., Kumar, A. and Singh, V. P., Current understanding of the seismotectonics of western Nepal Himalaya and vinicity. Acta Geod. Geoph. Hung, 2010, 45(2), 195–209; doi: 10.1556/AGeod.45.2010.2.5

  • McGuire, R. K., Seismic ground motion parameter relations. J. Geotech. Eng. Div. ASCE, 1978, 104, 481–490.

  • Campbell, K. W., The dependence of peak horizontal acceleration on magnitude, distance, and site effects for small-magnitude earthquakes in California and eastern North America. Bull. Seismol. Soc. Am., 1989, 79, 1311–1346.

  • Kumar, D., Toetia, S. S. and Khattri, K. N., The representability of attenuation characteristics of strong ground motions observed in the 1986 Dharmsala and 1991 Uttarkashi earthquakes by available empirical relations. Curr. Sci., 1997, 73, 543–547.

  • Sharma, M. L., Attenuation relationship for estimation of peak ground horizontal accelration using data from strong-motion arrays in India. Bull. Seismol. Soc. Am., 1998, 88(4), 1063–1069.

  • Parvez, I. A., Gusev, A. A., Panza, G. F. and Petukhin, A. G., Preliminary determination of the interdependece among strong motion amplitude, earthquake magnitude and hypocentral distance for the Himalaya region. Geophys. J. Int., 2001, 144, 577–596.

  • Compbell, K. W., Strong motion attenuation relations: a ten-year perspective. Earthquake Spectra, 1985, 1, 759–804.

  • Joshi, J., Analysis of strong motion data of the Uttarkashi earthquake of 20 October 1991 and the Chamoli earthquake of 28 March 1999 for determining the Q value and source spectra parameters. ISET J. Earth Technol., 2006, 468(43), 11–29.

  • Kumar, A., Mittal, H., Sachdeva, R. and Kumar, A., Indian strong motion instrumentation network. Seismol. Res. Lett., 2012, 83(1), 59–66.

  • Mittal, H., Kumar, A. and Rebecca, R., Indian strong motion instrumentation Network and its site characterization. Int. J. Geosci., 2012, 3(6), 1151–1167.

  • Malik, S., Sharma, M. L. and Khandelwal, D. D., Estimation of spectral strong ground motion for North East India using PSHA. In 13th Symposium on Earthquake Engineering, Roorkee, 18–20 December 2006, pp. 137–147.

  • www.pesmos.in

  • Kumar, N., Rawat, G., Choubey, V. M. and Hazarika, D., Earthquake precursory research in western Himalaya based on the Multi-Parametric Geophysical Observatory data. Acta Geophys., 2013, 61(4), 977–999; doi: 10.2478/s11600-013-0133-1

  • Arora, B. R., Kamal, Kumar, A., Rawat, G., Kumar, N. and Choubey, V. M., First observations of the earth from Indian Super conducting Gravimeter in the Himalaya. Curr. Sci., 2008, 95(11), 1611–1617.

  • Mishra, O. P., Zhao, D. and Singh, D. D., Northwest Pacific fundamental mode Rayleigh-wave group velocity and its relationship with tectonic structures. Bull. Seismol. Soc. Am., 2005, 95(6), 2125–2135.

  • Mishra, O. P., Crustal heterogeneity in bulk velocity beneath the 2001 Bhuj earthquake source zone and its implications. Bull. Seismol. Soc. Am., 2013, 103(6), 3235–3247.

  • Imanishi, Y., Sato, T., Higashi, T., Sun, W. and Okubo, S., A network of superconducting gravimeters detects submicrogal coseismic gravity changes. Science, 2004, 306, 476–478.

  • Kim, J. W., Neumeyer, J., Kim, T. H., Woo, I, Park, H. J., Jeon, J. S. and Kim, K. D., Analysis of superconducting gravimeter measurements at MunGyung Station, Korea. J. Geodyn., 2009, 47, 180–190.

  • Arora, B. R., Rawat, G., Kumar, N. and Choubey, V. M., MultiParametric Geophysical Observatory: gateway to integrated earthquake precursory research. Curr. Sci., 2012, 103, 1286–1299.

  • Parvez, I. A., Nekrasova, A. and Kossobokov, V., Estimation of seismic hazard and risks for the Himalayas and surrounding regions based on unified scaling Law for earthquakes. Nat. Hazards, 2014, 71(1), 549–562.


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  • Strong Motion Data Analysis of the 4 April 2011 Western Nepal Earthquake (M 5.7) and its Implications to the Seismic Hazard in the Central Himalaya

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Authors

Naresh Kumar
Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, India
D. D. Khandelwal
Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, India

Abstract


In the present study, the strong motion data of the 4 April 2011 western Nepal earthquake (M 5.7) recorded by a dense network of 24 strong motion accelerograph stations have been used to estimate horizontal and vertical component of the peak ground acceleration (PGA) to better understand its bearing on the seismic hazard scenario of the Central Himalayan region. We assimilated attenuation curves using the observed PGA values and found that the zone is associated with higher H/V ratio in which the attenuation trend remains bimodal with one trend for closer distance up to 100-120 km, while the other trend corresponds to distances extending beyond 1000 km. We infer that the two different PGA trends have close bearing on the major tectonics and structural set-up of the region, which is possibly attributed to subsurface structural variation through which the seismic wave travels, suggesting changes of crustal heterogeneities beneath the source zone. The present work may improve the concept of ground motion model for evaluating seismic hazard for the Himalaya.

Keywords


Earthquakes, Peak Ground Acceleration, Seismic Hazard, Strong Motion Data.

References





DOI: https://doi.org/10.18520/cs%2Fv109%2Fi10%2F1822-1830