6S (2012-2030): Central Otago Seismic Array

• Victoria University of Wellington, New Zealand

The Central Otago Seismic Array (COSA) is designed to help characterize the nature of crustal seismicity occurring in the central South Island, New Zealand. The network spans the transition region between the Fiordland subduction zone and transpressional deformation along a major continental transform, the Alpine Fault. Specifically, COSA has been used to compile detailed microseismic catalogues, including focal mechanisms and stress inversions, and has been used to characterize the aftershock sequence of a ML6 earthquake in May 2015.

COSA is composed of eight temporary seismic stations. These sites were installed between June 2012 and March 2013, to supplement and increase the density of existing permanent GeoNet stations in the region. Each station consists of a three component broadband seismometer, with Guralp CMG-40T and CMT-3ESPC sensors used for original instalment, and a Reftek data logger (DAS, model RT130-01). Later sensor re-installations at two stations used a Marks L-4C and a Compact Trillium Sensor. All sensors are orientated with their N horizontal channel aligned with magnetic north (23.5 degrees clockwise from true north). Six of the eight stations have run continuously since their installation, with minor gaps in data owing to sensor flooding and card issues.

FDSN Web Services provide a common data access API for seismic data.

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