The P-wavespeed structure in the lowermost 700 km of the mantle below the central part of the Indian Ocean

Physics of the Earth and Planetary Interiors

Volumn 161, Issue 3-4, 2007, Pages 243-266

  Wright, C ^a   Kuo, B Y ^a  

^a INSTITUTE OF EARTH SCIENCES   (Taiwan)

Author keywords

D region; Indian ocean; P wavespeed models; Triplication in travel times

Indexed keywords

EARTHQUAKES; MATHEMATICAL MODELS; SEISMOGRAPHS; SEISMOLOGY; STRUCTURAL GEOLOGY; WAVEFORM ANALYSIS;

CORE-MANTLE BOUNDARY; MANTLE; P-WAVESPEED MODELS; SEISMOGRAMS;

EARTH (PLANET);

AMPLITUDE; ARRIVAL TIME; CORE-MANTLE BOUNDARY; DISCONTINUITY; P-WAVE; SEISMOGRAM; STACKING; VELOCITY STRUCTURE; WAVE VELOCITY;

INDIAN OCEAN;

EID: 34247500261     PISSN: 00319201     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.pepi.2007.02.006     Document Type: Article

References (44)

1. Aki K., and Richards P.G. Quantitative Seismology. second ed. (2002), University Science Books, Sausalito, California p. 699
2. Bolt B.A. Summary value smoothing of physical time series with unequal intervals. J. Comput. Phys. 29 (1978) 357-369
3. Bullen K.E. Compressibility-pressure hypothesis and the Earth's interior. Mon. Not. R. Astron. Soc., Geophys. Suppl. 5 (1949) 355-368
4. Bullen K.E., and Bolt B.A. An Introduction to the Theory of Seismology. fourth ed. (1985), Cambridge University Press, Cambridge p. 499
5. Bungum H., and Husebye E.S. Errors in delay time measurements. Pure Appl. Geophys. 91 (1971) 56-70
6. Carder D.S. Travel times from central Pacific nuclear explosions and inferred mantle structure. Bull. Seism. Soc. Am. 54 (1964) 2271-2294
7. Carlson R.W., Grove T.L., de Wit M.J., and Gurney J.J. Program to study crust and mantle of the Archean craton in southern Africa. EOS. Trans. Am. Geophys. Union 77 29 (1996) 273 and 277
8. Chapman C.H. A new method for computing synthetic seismograms. Geophys. J. R. Astron. Soc. 54 (1978) 481-518
9. Chapman C.H., Chu J.-Y., and Lyness D.G. The WKBJ seismogram algorithm. In: Doornbos D.J. (Ed). Seismological Algorithms: Computational Methods and Computer Programs (1988), Academic Press, London 47-74
10. Davis J.P., and Weber M. Lower mantle inhomogeneity observed at the GRF array. Geophys. Res. Lett. 17 (1990) 187-190
11. Gangi A.F., and Fairborn J.W. Accurate determination of seismic array steering delays by an adaptive computer program. Supplemento al Nuovo Cimento Series 1 6 (1968) 105-115
12. Hirose K. Postperovskite phase transition and its geophysical implications. Rev. Geophys. 44 (2006) RG3001 10.1029/2005RG000186
13. James D.E., et al. Tectospheric structure beneath southern Africa. Geophys. Res. Lett. 28 (2001) 2485-2488
14. Jeffreys H. Theory of Probability. third ed. (1961), Oxford University Press, Oxford p. 459
15. In: Kennett B.L.N. (Ed). IASPEI 1991 Seismological Tables (1991), Research School of Earth Sciences, Australian National University, Canberra, Australia p. 167
16. King D.W., Mereu R.F., and Muirhead K.J. The measurement of apparent velocity and azimuth using adaptive processing techniques on data from the Warramunga seismic array. Geophys. J. R. Astron. Soc. 35 (1973) 137-167
17. Kito T., Krüger F., and Negishi H. Seismic heterogeneous structures in the lowermost mantle beneath the southwestern Pacific. J. Geophys. Res. vol. 109 (2004) B09304 10.1029/2003JB002677
18. Lay T., and Garnero E.J. Core-mantle boundary structure and processes. In: Sparks R.S.J., and Hawkesworth C.J. (Eds). The State of the Planet: Frontiers and Challenges in Geophysics. Geophysical Monograph 150, IUGG vol. 19 (2004), American Geophysical Union, Washington, DC 25-41
19. Lay T., and Helmberger D.V. A lower mantle S wave triplication and the shear wave velocity structure of D″. Geophys. J. R. Astron. Soc. 75 (1983) 799-838
20. Loper D.E., and Lay T. The core-mantle boundary region. J. Geophys. Res. 100 (1995) 6397-6420
21. Muirhead K.J. Eliminating false alarms when detecting seismic events automatically. Nature 217 (1968) 533-534
22. th root process applied to seismic array data. Geophys. J. R. Astron. Soc. 47 (1976) 197-210
23. Müller G. The reflectivity method: a tutorial. J. Geophys. 58 (1985) 153-174
24. 3. Science 304 (2004) 855-858
25. Nguuri T.K., et al. Crustal structure beneath southern Africa and its implications for the formation and evolution of the Kaapvaal and Zimbabwe cratons. Geophys. Res. Lett. 28 (2001) 2501-2504
26. Ni S., Helmberger D., and Tromp J. Three-dimensional structure of the African superplume from waveform modelling. Geophys. J. Int. 161 (2005) 283-294
27. Nolet G., Dahlen F.A., and Montelli R. Traveltimes and amplitudes of seismic waves: a reassessment. In: Levander A., and Nolet G. (Eds). Seismic Earth: Array Analysis of Broadband Seismograms. Geophysical Monograph 157 (2005), American Geophysical Union, Washington, DC 25-41
28. Reasoner C., and Revenaugh J. Short-period P wave constraints on D″ reflectivity. J. Geophys. Res. 104 (1999) 955-961
29. Reinsch C.H. Smoothing by spline functions. Numer. Math. 19 (1967) 177-183
30. Russell S.A., Reasoner C., Lay T., and Revenaugh S. Coexisting shear- and compressional-wave seismic velocity discontinuities beneath the central Pacific. Geophys. Res. Lett. 28 (2001) 2281-2284
31. Schimmel M., and Paulssen H. Noise reduction and detection of weak, coherent signals through phase-weighted stacks. Geophys. J. Int. 130 (1997) 497-505
32. Simon R.E., Wright C., Kgaswane E.M., and Kwadiba M.T.O. The P wavespeed structure below and around the Kaapvaal craton to depths of 800 km, from travel times and waveforms of local and regional earthquakes and mining-induced tremors. Geophys. J. Int. 151 (2002) 132-145
33. VanDecar J.C., and Crosson R.S. Determination of teleseismic relative phase arrival times using multi-channel cross-correlation and least squares. Bull. Seism. Soc. Am. 80 (1990) 150-169
34. Vidale J.E., and Benz H.M. Seismological mapping of fine structure near the base of the Earth's mantle. Nature 361 (1993) 529-532
35. Weber M. P and S wave reflections from anomalies in the lower mantle. Geophys. J. Int. 115 (1993) 183-210
36. Wen L. Seismic evidence for a rapidly varying compositional anomaly at the base of the Earth's mantle beneath the Indian Ocean. Earth Planet. Sci. Lett. 194 (2001) 83-95
37. Wessel P., and Smith W.H.F. New, improved version of the generic mapping tools released. EOS Trans. Am. Geophys. Union 79 (1998) 579
38. Wright C. Array studies of P phases and the structure of the D″ region of the mantle. J. Geophys. Res. 78 (1973) 4965-4982
39. Wright C. The LSDARC method of seismic refraction interpretation: principles, practical considerations and advantages. Near Surf. Geophys. 4 (2006) 187-200
40. Wright, C., Kuo, B.-Y. 2007. Evidence for an elevated 410 km discontinuity below the Luzon, Philippines region and transition zone properties using seismic stations in Taiwan and earthquake sources to the south. Earth Planets Space, in press.
41. Wright C., and Lyons J.A. Further evidence for radial velocity anomalies in the lower mantle. Pure Appl. Geophys. 119 (1981) 137-162
42. Wright C., Muirhead K.J., and Dixon A.E. The P wave velocity structure near the base of the mantle. J. Geophys. Res. 90 (1985) 623-634
43. Wright C., Kwadiba M.T.O., Kgaswane E.M., and Simon R.E. The structure of the crust and upper mantle to depths of 320 km beneath the Kaapvaal craton, from P wave arrivals generated by regional earthquakes and mining-induced tremors. J. Afr. Earth Sci. 35 (2002) 477-488
44. Young C.J., and Lay T. Evidence for a shear velocity discontinuity in the lower mantle beneath India and the Indian Ocean. Phys. Earth Planet. Int. 49 (1987) 37-53