Encyclopedia of Earthquake Engineering

2015 Edition
| Editors: Michael Beer, Ioannis A. Kougioumtzoglou, Edoardo Patelli, Siu-Kui Au

Long-Period Moment-Tensor Inversion: The Global CMT Project

  • Göran EkströmEmail author
  • Meredith Nettles
Reference work entry
DOI: https://doi.org/10.1007/978-3-642-35344-4_291


Global centroid-moment-tensor inversion; Long-period earthquake analysis


Long-period moment-tensor inversion is a methodology to estimate first-order earthquake parameters by inverse modeling of long-period seismograms, typically recorded at teleseismic distances. Data from large numbers of globally distributed digital broadband seismographs and knowledge of elastic wave propagation through the heterogeneous Earth currently make possible the uniform determination of moment tensors of earthquakes with M ≥ 5.0. The Global CMT Project is an ongoing systematic research effort to study all significant earthquakes occurring worldwide using long-period moment-tensor inversion and to maintain and curate a catalog of the resulting earthquake parameters.

Earthquakes are complex geophysical events with the potential to cause vast destruction. When and where earthquakes occur and a characterization of their size and effects form knowledge of scientific and societal value. For...

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  1. Dziewonski AM, Anderson DL (1981) Preliminary reference Earth model. Phys Earth Planet Int 25:297―356CrossRefGoogle Scholar
  2. Dziewonski AM, Chou T-A, Woodhouse JH (1981) Determination of earthquake source parameters from waveform data for studies of global and regional seismicity. J Geophys Res 86:2825―2852CrossRefGoogle Scholar
  3. Ekström G, Tromp J, Larson EWF (1997) Measurements and global models of surface wave propagation. J Geophys Res 102:8137―8157CrossRefGoogle Scholar
  4. Ekström G, Nettles M, Dziewonski AM (2012) The global CMT project 2004―2010: centroid-moment tensors for 13,017 earthquakes. Phys Earth Planet Int 200―201:1―9CrossRefGoogle Scholar
  5. Gilbert F (1971) Excitation of the normal modes of the Earth by earthquake sources. Geophys J Roy Astron Soc 22(2):223―226CrossRefGoogle Scholar
  6. Kanamori H (1977) The energy release in great earthquakes. J Geophys Res 82:2981―2987CrossRefGoogle Scholar
  7. Woodhouse JH, Dziewonski AM (1984) Mapping the upper mantle: three-dimensional modeling of Earth structure by inversion of seismic waveforms. J Geophys Res 89:5953―5986CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Department of Earth and Environmental Sciences, Lamont-Doherty Earth ObservatoryColumbia UniversityPalisadesUSA