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Seismic Character of Moho Beneath the NW Himalaya and Ladakh Inferred from Regional Earthquakes Travel Time Data

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Abstract

We study the uppermost mantle velocities and dip of Indian Moho beneath the NW Himalaya and Ladakh using 42 regional waveform data recorded on 15 seismographs along a ~600 km-long profile. We use the two-way travel time and interstation velocity methods. The apparent Pn and Sn velocities beneath the NW Himalaya are 8.08 ± 0.04 and 4.64 ± 0.07 km/s for earthquakes occurring south of the profile (downdip, western Indian shield) and 8.70 ± 0.13 and 4.76 ± 0.12 km/s for earthquakes from north (updip, western Tibet). Similarly, these velocities beneath Ladakh are 7.18 ± 0.07 and 4.32 ± 0.05 km/s for earthquakes due south (downdip, north Indian shield) and 8.50 ± 0.10 and 4.39 ± 0.12 km/s for earthquakes due north (updip, western Tibet). These velocity variations constrain the Moho dip at ~2.4 ± 0.14º beneath the NW Himalaya and ~6.6 ± 0.54º beneath Ladakh. Considering the varying dips along the profile, we observe that the true Pn (8.37 ± 0.07 km/s) and Sn (4.70 ± 0.1 km/s) velocities are higher for the NW Himalaya than for Ladakh (7.73 ± 0.08 and 4.33 ± 0.09 km/s). The large variation in interstation Pn velocity is observed between the station pairs near the Indus Zangpo Suture zone due to steep dipping (~7.1º to 6.26º) of the Indian Moho. In the Himalaya region, the interstation and average values of the velocities and Moho dip are comparable, whereas a variation is observed in different segments of the Ladakh region. The results show that the Indian Moho is underthrusting at a shallow angle (~2.5º) beneath the Himalaya, steepens abruptly (~6.6º) further north of the Southern Tibetan Detachment and continues at a shallow angle (~3.8º) beneath Ladakh.

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References

  • Argand, E. (1924). La tectonque de l’Asie. Proceedings International Geological Congress, 7, 171–372.

    Google Scholar 

  • Barazangi, M., & Ni, J. (1982). Velocities and propagation characteristics of Pn and Sn beneath the Himalaya arc and Tibetan Plateau: Possible evidence for underthrusting of Indian continental lithosphere beneath Tibet. Geology, 10, 179–185.

    Article  Google Scholar 

  • Caldwell, W. B., Klemperer, S. L., Rai, S. S., & Lawrence, J. F. (2009). Partial melt in the upper-middle crust of the northwest Himalaya revealed by Rayleigh wave dispersion. Tectonophysics, 477, 58–65.

    Article  Google Scholar 

  • Chamoli, P., Pandey, A. K., Dimri, V. P., & Banerjee, P. (2011). Crustal configuration of the northwest Himalaya based on modeling of gravity data. Pure and Applied Geophysics, 168, 827–844.

    Article  Google Scholar 

  • Chen, W. P., & Molnar, P. (1981). Constraints on seismic wave velocity structure beneath the Tibetan Plateau and their tectonic implications. Journal Geophysical Research, 86, 5937–5962.

    Article  Google Scholar 

  • Hirn, A., Lepine, J. C., Jobert, G., Sapin, M., Wittlinger, G., Xin, X. Z., et al. (1984). Crustal structure and variability of the Himalayan border of Tibet. Nature, 307, 23–25.

    Article  Google Scholar 

  • International Seismological Centre, On-line Event Bibliography, http://www.isc.ac.uk/event_bibliography, International Seismological Centre, Thatcham, United Kingdom, 2006.

  • Kaila, L. L., Krishna, V. G., Chowdhury, K. R., & Narain, H. (1978). Structure of the Kashmir Himalaya from Deep Seismic soundings. Journal of Geological Society of India, 19, 1–20.

    Google Scholar 

  • Klemperer, S. L. (2006). Crustal flow in Tibet: geophysical evidence for the physical state of Tibetan lithosphere, and inferred patterns of active flow, in channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones. Geological Society of London, Special Publications, 268, 39–70.

    Article  Google Scholar 

  • Kumar, N., Sharma, J., Arora, B. R., & Mukhopadhyay, S. (2009). Seismotectonics model of the Kangra–Chamba sector of Northwestern Himalaya: constraints from joint hypocenter determination and focal mechanism. Bulletin of the Seismological Society of America, 99(1), 95–109.

    Article  Google Scholar 

  • Lastowka, L. A., & Sheehan, A. F. (2005). CDROM Interstation Pn study along the Rio Grande Rift in the Rocky Mountain region. An Evolving lithosphere, Geophysical Monograph Series, 154, 379–384.

    Google Scholar 

  • Lu, Y., Liu, B., Ni, S., & Pei, S. (2013). Sn velocity tomography beneath the Himalayan collision zone and surrounding regions. Earth Planets Space, 65, 725–730.

    Article  Google Scholar 

  • Lyon-Caen, H., & Molnar, P. (1985). Gravity anomalies, flexure of the Indian plate and the structure, support and evolution of the Himalaya and Ganga Basin. Tectonics, 4, 513–538.

    Article  Google Scholar 

  • Mattayer, M. (1986), Intracontinental subduction, crust-mantle decollement and crustal stacking wedge in the Himalayas and other collision belts. In, Coward M.P., Ries, Ac (Eds.), Collision Tectonics, Geological Society of London, Special Publication 19, 37–50.

  • McNamara, D. E., Owens, T. J., & Walter, W. R. (1995). Observations of regional phase propagation across the Tibetan Plateau. Journal Geophysical Research, 100, 22215–22229.

    Article  Google Scholar 

  • Menke, W. H. (1977). Lateral inhomogeneities in P velocity under the Tarbela array of the Lesser Himalayas of Pakistan. Bulletin of the Seismological Society of America, 67(3), 725–734.

    Google Scholar 

  • Menke, W. H., & Jacob, K. (1976). Seismicity patterns in Pakistan and northwestern India—a comparison of Tarbela array and WWSSN data. Bulletin of the Seismological Society of America, 6, 1695–1711.

    Google Scholar 

  • Molnar, P. (1988). A review of geophysical constraints on the deep structure of the Tibetan Plateau, the Himalaya and the Karakoram, and their tectonic implications. Philosophical Transactions of the Royal Society, 326, 33–38.

    Article  Google Scholar 

  • Ni, J., & Barazangi, M. (1983). High frequency seismic wave propagation beneath the Indian shield, Himalayan arc, Tibetan plateau and surrounding regions: High uppermost mantle velocities and efficient propagation beneath Tibet. Geophysical Journal of the Royal Astronomical Society, 72, 665–689.

    Article  Google Scholar 

  • Oreshin, S., Kiselev, S., Vinnik, L., Prakasam, K. S., Rai, S. S., Makeyeva, L., et al. (2008). Crust and mantle beneath western Himalaya, Ladakh and western Tibet from integrated seismic data. Earth and Planetary Science Letters, 271, 75–87.

    Article  Google Scholar 

  • Oreshin, S., Vinnik, L. P., Kiselev, S. G., Rai, S. S., Prakasam, K. S., & Treussov, A. V. (2011). Deep seismic structure of the Indian shield, western Himalaya, Ladakh and Tibet. Earth and Planetary Science Letters, 307, 415–429.

    Article  Google Scholar 

  • Patriat, P., & Achache, J. (1984). India-Asia collision chronology has implications for crustal shortening and driving mechanism of plates. Nature, 311, 615–621.

    Article  Google Scholar 

  • Pei, S., Sun, Y., & Toksoz, M. N. (2011). Tomographic Pn and Sn velocities beneath the continental collision zone from Alps to Himalaya. Journal Geophysical Research, 116, B10311. doi:10.1029/2010JB007845.

    Article  Google Scholar 

  • Rai, S. S., Ashish, A., Padhi, A., & Sarma, P. R. (2009). High crustal seismic attenuation in Ladakh-Karakoram. Bulletin of the Seismological Society of America, 99(1), 407–415.

    Article  Google Scholar 

  • Rai, S. S., Priestley, K., Gaur, V. K., Mitra, S., Singh, M. P., & Searle, M. P. (2006). Configuration of the Indian Moho beneath the NW Himalaya and Ladakh. Geophysical Reseach Letters, 33, L15308. doi:10.1029/2006GL026076.

    Article  Google Scholar 

  • Replumaz, A., Karason, H., van der Hilst, R. D., Besse, J., & Tapponnier, P. (2004). 4-D evolution of SE Asia’s mantle from geological reconstructions and seismic tomography. Earth and Planetary Science Letters, 221, 103–115.

    Article  Google Scholar 

  • Stien, S., and Wysession, M., An Introduction to Seismology, earthquakes, and Earth structure (Blackwell Publishing Ltd., 2003).

  • Thakur, C. V. (1992). Geology of western Himalaya. Oxford: Pergamon Press.

    Google Scholar 

  • Tiwari, V. M., Mishra, D. C., & Pandey, A. K. (2015). The lithospheric density structure below the western Himalaya syntaxis: tectonic implications. Geological Society of London, Special Publications, 412, 55–65.

    Article  Google Scholar 

  • Yin, A., & Harrison, T. M. (2000). Geological evolution of the Himalayan-Tibetan orogen. Annual Review of Earth and Planetary Sciences, 28, 211–280.

    Article  Google Scholar 

  • Zhao, L. S., & Xie, J. (1993). Lateral variation in compressional velocities beneath Tibetan Plateau from Pn traveltime tomography. Geophysical Journal International, 115, 1070–1084.

    Article  Google Scholar 

  • Zhou, H. W., & Murphy, M. (2005). Tomographic evidence for wholeseal underthrusting of Indian beneath the entire Tibet plateau. Journal of Asian Earth Sciences, 25, 445–457.

    Article  Google Scholar 

Download references

Acknowledgements

The field work was supported by the Deep Continental Studies Program of the Department of Science & Technology, India. We are very thankful to the members of the Seismic Tomography group of CSIR-NGRI, for their support during seismological station deployment. We are grateful to Dr. S.S. Rai for useful discussions. NK acknowledges the financial support from the Ministry of Social and Justice Empowerment, Government of India. SG acknowledges the support from CSIR-NGRI projects MLP-6505-28(SKG) and INDEX-PSC-0204. Two anonymous reviewers and Editor-in-Chief Carla F. Braitenberg are thanked for their constructive comments and suggestions to improve the manuscript.

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  1. CSIR-National Geophysical Research Institute, Hyderabad, 500007, India

    Nagaraju Kanna, K. S. Prakasam & Sandeep Gupta

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  1. Nagaraju Kanna
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  2. K. S. Prakasam
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  3. Sandeep Gupta
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Correspondence to Nagaraju Kanna.

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Kanna, N., Prakasam, K.S. & Gupta, S. Seismic Character of Moho Beneath the NW Himalaya and Ladakh Inferred from Regional Earthquakes Travel Time Data. Pure Appl. Geophys. 174, 835–847 (2017). https://doi.org/10.1007/s00024-016-1451-4

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