International Federation of Digital Seismograph Networks

1H (2012-2020): Central Otago Seismic Array

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FDSN Network Information

FDSN code 1H (2012-2020) Operated by Victoria University of Wellington
Network name Central Otago Seismic Array (COSA) Deployment region New Zealand
Start date June 22, 2012 End date Jan. 1, 2020
Short description

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.

Citation Information

Digital Object Identifier (DOI)
Emily Warren-Smith, Calum Chamberlain, Timothy Stern (2012): Central Otago Seismic Array. International Federation of Digital Seismograph Networks. Dataset/Seismic Network. 10.7914/SN/1H_2012

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