The Darfield (Canterbury) earthquake
Geodetic observations and preliminary source model
DOI:
https://doi.org/10.5459/bnzsee.43.4.228-235Abstract
High quality GPS and differential InSAR data have been collected for determining the ground deformation associated with the September 2010 Darfield (Canterbury) earthquake. We report preliminary results from a subset of these data and derive a preliminary source model for the earthquake. While the majority of moment release in the earthquake occurred on the strike-slip Greendale Fault a number of other fault segments were active during the earthquake including a steeply southeast-dipping thrust fault coincident with the earthquake hypocentre.
References
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”. J. Geophys. Res. 105: 16,119-16,137. DOI: https://doi.org/10.1029/2000JB900008
Arnadottir, T., Beavan, J., Pearson, C. (1995), “Deformation associated with the 18 June 1994, Arthur's Pass earthquake, New Zealand. N. Z. J. Geol. Geophys. 38: 553-558.
Bannister, S., Thurber, C., Louie, J. (2006), “Detailed fault structure highlighted by finely relocated aftershocks, Arthur’s Pass, New Zealand”. Geophys. Res. Lett. 33: L18315. doi:10.1029/2006GL027462 DOI: https://doi.org/10.1029/2006GL027462
Beavan, J. (2008), “Consultancy services for PositioNZonLine, Phase 2 (PONL-02)”. GNS Science Consultancy Report 2008/136: 79 p. GNS Science, Lower Hutt, New Zealand.
Beavan, J., Samsonov, S., Denys, P., Sutherland, R., Palmer, N., Denham, M. (2010), “Oblique slip on the Puysegur subduction interface in the July 2009 MW 7.8 Dusky Sound earthquake from GPS and InSAR observations: implications for the tectonics of southwestern New Zealand”. Geophys. J. Int. doi: 10.1111/j.1365-246X.2010.04798.x DOI: https://doi.org/10.1111/j.1365-246X.2010.04798.x
Cousins, J., McVerry, G. (2010), “Overview of strong motion data from the Darfield Earthquake”. Bulletin of the New Zealand Society for Earthquake Engineering 43: this volume. DOI: https://doi.org/10.5459/bnzsee.43.4.222-227
Darby, D.J., Beavan, J. (2001), “Evidence from GPS measurements for contemporary plate coupling on the southern Hikurangi subduction thrust and partitioning of strain in the upper plate”. J. Geophys. Res. 106: 30,881-30,891. DOI: https://doi.org/10.1029/2000JB000023
Forsyth, P.J., Barrell, D.J.A., Jongens, R. (2008), “Geology of the Christchurch area”. Institute of Geological and Nuclear Sciences 1:250,000 Geological Map 16. 1 sheet + 67 p. GNS Science, Lower Hutt, New Zealand.
Gledhill, K., Ristau, J., Reyners, M., Fry, B., Holden, C., and the GeoNet Team (2010), “The Darfield (Canterbury) earthquake of September 2010: Preliminary seismological report”. Bulletin of the New Zealand Society for Earthquake Engineering 43(4): this volume. DOI: https://doi.org/10.5459/bnzsee.43.4.215-221
Quigley, M., Van Dissen, R., Villamor, P., and 20 others (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
