Deployments & Instrumentation

     ARRAY - November 2009 -  February 2010

    50 temporary seismic sites were deployed throughout the Wellington and Wairarapa regions in November 2009. These stations remained in place until end of February, 2010. The primary aim for this deployment was to record the signal from the offshore airgun shots being used in the PEGASUS survey. A total of 69,000 shots were recorded by the 50 station ARRAY (red dots). This array was also supplemented by 25 GeoNet stations (yellow dots) operating in the southern North Island and in the Marlborough region. Sites remained in place and recorded earthquakes from around the world.

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       TRANSECT - 1 March 2010 -  31 March 2010

    The SAHKE transect line (TRANSECT) consists of several seismometer deployments, including an short-term dense seismometer array, a longer term dispersed seismometer array and an offshore, Ocean Bottom Seismometer (OBS) array. These seismometers recorded arrivals from an offshore airgun source being released along the same transect trajectory. Shots were fired every 100m off shore, providing a larger dataset to produce a highly details 2D seismic velocity cross section along this line.

     

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    WANGANUI line- 15 March 2010 -  18 March 2010Wanganui.jpg

     The WANGANUI line was deployed to record the arrival of the airgun source shooting in the Wanganui Basin off the Kapiti coast. Eight onshore instruments were deployed along the flanks for state highway 4 north of Wanganui city and one deployed to the south. A Geonet station located on Kaiti Island also deployed the shots. These stations only recorded the airgun source as instruements were need back on the east coast to record the final two PEGASUS survey lines.

     

     

     

    NORTHERN Lines - 19 March 2010 - 29 March 2010

     The Northern Lines were deployed to record the final two northermost survey lines of the Pegasus basin. Sites were deployed in lines collinear to the offshore profiles. The northernmost line ran through Castlepoint and consisted of six seismometer sites, and the more southern of the two lines ran through Riverdales and consisted of eight seismic sites. These sites were left in place after the offshore survey was complete to record passive seismicity (earthquakes).

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