Temporal and spatial evolution of hypocentres and anisotropy from the Darfield aftershock sequence: Implications for fault geometry and age

Syracuse, E. M., Holt, R. A., Savage, M. K., Johnson, J. H., Thurber, C. H., Unglert, K., Allan, K. N., Karaliyadda, S. and Henderson, M. (2012) Temporal and spatial evolution of hypocentres and anisotropy from the Darfield aftershock sequence: Implications for fault geometry and age. New Zealand Journal of Geology and Geophysics, 55 (3). pp. 287-293. ISSN 0028-8306

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Abstract

The first four months of aftershocks of the Darfield earthquake have been studied using data from temporary and permanent seismic stations to investigate the fault geometry, stress field and evolution of seismicity and seismic properties. Earthquake relocations illuminate fault segments and show that the majority of aftershocks occurred beyond the areas of highest slip during the Darfield earthquake. Seismic anisotropy shows a mixture of fast directions parallel to the maximum horizontal stress and fault-parallel fast directions. This, combined with the lack of observable growth of seismicity along fault segments, suggests that the Greendale Fault broke a pre-existing fault plane.

Item Type:	Article
Uncontrolled Keywords:	aftershocks,earthquake locations,anisotropy,faults,multiplets,stress
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Geosciences
Depositing User:	Pure Connector
Date Deposited:	02 Feb 2015 16:44
Last Modified:	28 Mar 2025 06:22
URI:	https://ueaeprints.uea.ac.uk/id/eprint/51749
DOI:	10.1080/00288306.2012.690766

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