The Darfield (Canterbury) earthquake of September 2010

Preliminary seismological report

  • Ken Gledhill GNS Science, Lower Hutt, New Zealand
  • John Ristau GNS Science, Lower Hutt, New Zealand
  • Martin Reyners GNS Science, Lower Hutt, New Zealand https://orcid.org/0000-0003-1931-0730
  • Bill Fry GNS Science, Lower Hutt, New Zealand
  • Caroline Holden GNS Science, Lower Hutt, New Zealand

Abstract

The Darfield moment magnitude (Mw) 7.1 earthquake of September 2010 is the first heavily damaging earthquake to strike New Zealand since the surface wave magnitude (MS) 7.8 Hawkes Bay earthquake in 1931. Although the earthquake has a clear strike-slip surface expression characterised by the Greendale Fault, seismological evidence suggests it is a complex event beginning as a reverse faulting earthquake. Evidence for complexity of the mainshock includes a well constrained epicentre north of the surface fault trace, high near-source vertical accelerations, first-motion and regional moment tensor focal mechanisms which differ from teleseismic solutions, and a complex aftershock pattern. The earthquake and aftershock sequence were very well recorded by the GeoNet sensor networks in the region, and provide an exceptional dataset for understanding the earthquake rupture process and reducing damage from future earthquakes. This was the most significant test of GeoNet since its inception in 2001, and the first such New Zealand event in the “internet age”. GeoNet data proved important for the response and the interaction with emergency management, media and the public. The GeoNet website sustained continued heavy load over the weeks and months following the earthquake but continued to deliver timely information because of significant improvements carried out as the aftershock sequence continued.

References

Hull, A. (1990), “Tectonics of the 1931 Hawke’s Bay earthquake”. New Zealand Journal of Geology and Geophysics 33: 309-320. DOI: https://doi.org/10.1080/00288306.1990.10425689

Hayes, G.P., Briggs, R.W., Sladen, A., Fielding, E.J., Prentice, C., Hudnut, K., Mann, P., Taylor, F.W., Crone, A.J., Gold, R., Ito, T., Simons, M. (2010), “Complex rupture during the 12 January 2010 Haiti earthquake”. Nature Geoscience 3: 800-805, doi: 10.1038/NGEO977. DOI: https://doi.org/10.1038/ngeo977

Cowan, H.A. (1991), “The North Canterbury earthquake of September 1, 1888”. Journal Royal Society New Zealand 21: 1-12. DOI: https://doi.org/10.1080/03036758.1991.10416105

Doser, D.I., Webb, T.H., Maunder, D.E. (1999), “Source parameters of large historical (1918-1962) earthquakes, South Island, New Zealand”. Geophysical Journal International 139: 769-794. DOI: https://doi.org/10.1046/j.1365-246x.1999.00986.x

Abercrombie, R. E., Webb, T. H., Robinson, R., McGinty, P.J.. Mori, J.J., Beavan, R.J. (2000), “The enigma of the Arthur’s Pass, New Zealand, earthquake 1. Reconciling a variety of data for an unusual earthquake sequence”. Journal of Geophysical Research 105(B7): 16,119–16,137.

Gledhill, K., Robinson, R., Abercrombie, R., Webb, T., Beavan, J., Cousins, J., Eberhart-Phillips, D., (2000), “The Mw 6.2 Cass, New Zealand Earthquake of 24 November, 1995: Reverse faulting in a strike-slip region”. New Zealand Journal of Geology and Geophysics 43: 255-269. DOI: https://doi.org/10.1080/00288306.2000.9514885

For details of GeoNet see www.geonet.org.nz.

Quigley M., Van Dissen R., Villamor P., Litchfield N., Barrell D., Furlong K., Stahl T.,. Duffy B, Bilderback E., Noble D., Townsend D., Begg J., Jongens R., Ries W., Claridge J., Klahn A., Mackenzie H., Smith A., Hornblow S., Nicol R., Cox S., Langridge R., Pedley K. (2010), “Surface rupture of the Greendale fault during the Darfield (Canterbury) earthquake, New Zealand: initial findings”. Bulletin of the New Zealand Society for Earthquake Engineering 43(4): this volume. DOI: https://doi.org/10.5459/bnzsee.43.4.236-242

Beavan, J., Samsonov, S., Motagh, M., Wallace, L., Ellis, S., Palmer, N. (2010), “The Darfield (Canterbury) earthquake: geodetic observations and preliminary source model”. New Zealand Society for Earthquake Engineering 43(4): this volume. DOI: https://doi.org/10.5459/bnzsee.43.4.228-235

Cousins, J., McVerry, G. (2010), “Overview of strong motion data from the Darfield Earthquake”. Bulletin of the New Zealand Society for Earthquake Engineering 43(4): this volume. DOI: https://doi.org/10.5459/bnzsee.43.4.222-227

Global CMT Project, see www.globalcmt.org.

The National Earthquake Information Centre, USGS teleseismic moment tensor solutions for the Darfield earthquake are at earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2 010atbj/#scitech

Petersen, T., Gledhill, K., Chadwick, M., Gale, N., Ristau, J. (2010), “The New Zealand National Seismograph Network”. Seismological Research Letters In press. DOI: https://doi.org/10.1785/gssrl.82.1.9

Fry, B., Bannister, S.C., Beavan, R.J., Bland, L.; Bradley, B.A., Cox, S.C., Cousins, W.J., Gale, N.H.; Hancox, G.T., Holden, C., Jongens, R., Power, W.L., Prasetya, G., Reyners, M.E., Ristau, J., Robinson, R., Samsonov, S., Wilson, K.J., GeoNet team (2009), “The Mw 7.6 Dusky Sound earthquake of 2009: preliminary report”. Bulletin of the New Zealand Society for Earthquake Engineering 43(1): 24-40. DOI: https://doi.org/10.5459/bnzsee.43.1.24-40

Twitter is a micro-blogging service, see twitter.com.

Facebook is a social networking website, see facebook.com.

The NEIC (USGS) energy solution can be found at earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2 010atbj/neic_atbj_e.php

Abercrombie A., Mori, J. (1994), “Local observations of the onset of a large earthquake, 28 June 1992 Landers, California”. Bulletin of the. Seismological Society of America 84: 725-734.

Wessel. P., Smith, W.H.E. (1991), “Free software helps map and display data”. EOS Transactions, American Geophysical Union 72: 441. DOI: https://doi.org/10.1029/90EO00319

Published
2010-12-31
How to Cite
Gledhill, K., Ristau, J., Reyners, M., Fry, B., & Holden, C. (2010). The Darfield (Canterbury) earthquake of September 2010. Bulletin of the New Zealand Society for Earthquake Engineering, 43(4), 215-221. https://doi.org/10.5459/bnzsee.43.4.215-221
Section
Articles

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