Lg wave attenuation of Northeast India Archaean as a new standard for Earth's most seismic regions
Article Sidebar
Published:
Dec 23, 2024
Keywords:
Lg attenuation,
crustal frequency,
scattering,
seismological standards,
Northeastern India seismic hazard,
Shillong Plateau-Mikir Hills
Volumes
Vols. 1-18 (1924-1944), ISSN 0044-2801
Main Article Content
Abstract
Physical modeling of Lg-wave attenuation is used in designing resilient and safer civil engineering structures and is thus vital for seismic hazard mitigation. I here report an attenuation model for one of the most active seismic sources of Himalayas-determined Northeastern region (NER) of India—the Eastern Shillong Plateau–Mikir Hills (ESPMH) tectonic domain—based on four well-constrained regional crustal earthquakes between 2007–2011. Frequency-dependent attenuation of Lg wave has crustal quality factor QLg≈48.92±1.08 and its frequency dependency of η≈0.97±0.16. The model is strictly high-frequency dependent (η=0.97), indicating that Lg attenuates dominantly by the scattering mechanism. The attenuation becomes critically high around the frequency of 0.5 Hz, the same as in the most tectonically active regions of the world. The extra low value of Qo=48.92 is the lowest reported from any continental part of our planet, which reveals a most attenuative Earth's crust posing a high seismic threat. As the results imply an extensive, seismically potentially destructive presence of melts/aqueous phases in Earth's crust, the probability of a damaging earthquake in and around ESPMH is non-negligible. Multiple additional factors contribute to the gross attenuation of Lg, as it is reasonable to account for the anomalously high attenuation in the NER Archaean as dominantly lithologically hardest and Earth-oldest terrane, making the new model pertinent to Earth's tectonically most active regions.
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Choudhury, B. (2024). Lg wave attenuation of Northeast India Archaean as a new standard for Earth’s most seismic regions. Journal of Geophysics, 66(1), 47-57. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/357
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References
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Choudhury, B.K. (2020) Attenuation of regional seismic Lg waves and its spectral characteristics in and around the Indo‑Burman Ranges of North Eastern region of India. Acta Geod. Geophys. 55(1):133–150. https://doi.org/10.1007/s40328-020-00286-5
Choudhury, B.K. (2022) Attenuation of Regional Seismic Lg Waves in the Eastern Himalayan Mobile Belt (EHMB) and the Mishmi Block of Arunachal Pradesh in the North–Eastern Region (NER) of India. Phys. Chem. Earth A/B/C 126:103129. https://doi.org/10.1016/j.pce.2022.103129
Dainty, A. (1981) A scattering model to explain seismic Q observations in the lithosphere between 1 and 30 Hz. Geophys. Res. Lett. 8:1126–1128. https://doi.org/10.1029/GL008i011p01126
Dwyer, J.J, Herrmann Y.R.B., Nuttli, O.W. (1983) Spatial Attenuation of the Lg Wave in the Central United States. Bull. Seism. Soc. Am. 73:781–796. https://doi.org/10.1785/BSSA0730030781
Fan, G.–W., Lay, T. (2002) Characteristics of Lg attenuation in the Tibetan Plateau. J. Geophys. Res. 107(B10):2256. https://doi.org/10.1029/2001JB000804
Fan, G.–W., Lay, T. (2003) Strong Lg attenuation in the Tibetan Plateau. Bull. Seism. Soc. Am. 93:2264–2272. https://doi.org/10.1785/0120030052
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Furumura, T., Kennett, B.L.N. (1998) On the nature of regional seismic phases, III, The influence of crustal heterogeneity on the wavefield for subduction earthquakes: The 1985 Michoacan and 1995 Copala, Mexico earthquakes. Geophys. J. Int. 135:1060–1084. https://doi.org/10.1046/j.1365-246X.1998.00698.x
García–Fernández, M., Canas, J.A. (1992) Regional Lg-wave attenuation and estimation of peak ground acceleration in the Iberian Peninsula. Earthquake Engineering, Tenth World Conference, Balkema, Rotterdam. https://www.iitk.ac.in/nicee/wcee/article/10_vol1_439.pdf
Haberland, C., Rietbrock, A. (2001) Attenuation tomography in the western central Andes: a detailed insight into the structure of a magmatic arc. J. Geophys. Res. 106:11151–11167. https://doi.org/10.1029/2000JB900472
Havskov, J., Ottemöller, L. (2010) Routine data processing in earthquake seismology. With sample data, exercises and software. Springer, pp.347. ISBN 9789048186969. https://doi.org/10.1007/978-90-481-8697-6
Havskov, J., Voss, P.H. Ottemöller, L. (2020). Seismological observatory software: 30 yr of SEISAN. Seismol. Res. Lett. 91(3):1846–1852. https://seisan.info https://doi.org/10.1785/0220190313
Hazarika, D., Baruah, S., Gogoi, N.K. (2009) Attenuation of coda waves in the Northeastern Region of India. J. Seismol. 13:141–160. https://doi.org/10.1007/s10950-008-9132-0
Herrmann, R.B., Kijko, A. (1983a) Modeling some empirical vertical component Lg relations. Bull. Seism. Soc. Am. 73:157–171. https://doi.org/10.1785/BSSA0730010157
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