Hamling et al (2017) Kaikoura Earthquake 14 November 2016, Moment - PowerPoint PPT Presentation

The 2016 Mw 7.8 Kaikoura earthquake Danielle Lindsay

Hamling et al (2017)

Kaikoura Earthquake 14 November 2016, Moment magnitude (Mw ) 7.8 Rupture length >170 km across 21 transpressional faults (Stirling et al., 2017) Max. horizontal displacement = Kekerengu fault with 12 m of dextral offset Max. vertical displacement = Papatea block up to 8 m, extensive coastal uplift Tsunami up to 3 m in Kaikoura Stirling et al (2017)

Kaikoura Earthquake Epicentre ~20km south of the Hope Fault Propagated northeast, terminating offshore from Cape Campbell on the Needles fault Two distinct seismotectonic zones 1) Northern Canterbury; primarily reverse motion then left step to … 1) Marlborough Fault System; primarily strike slip motion One of the most complex earthquakes ever recorded with modern instruments Stirling et al (2017)

Kekerengu Fault

Kekerengu Fault

5 m deep fissures Fissures Mole hills Slickenlines

Papatea Block

Papatea Block

Papatea Block Hamling et al (2017)

Geodetic data Campaign and continuous GPS Synthetic aperture radar (SAR)

Subsidence inland from Clarence and south of Humps and Hundalee faults Uplift Cape > 6 m Cape Campbell Campbell and Kaikoura Papatea block has misfit of modelled and observed data Hamling et al (2017)

InSAR reveals much more complex rupture than initially thought Good correlation between GPS and field observations Deformation focused along Humps and Hundalee and then steps left to Kekerengu fault. Hamling et al (2017)

Sentinel 1A - 20161115 - 20161127 Filtered Phase (phasefilt_ll.grd) Correlation (Corr_ll.grd)

Challenges... - Getting correct orbit files and data downloaded. - Switched to STRM 90m resolution as ran out of memory - Failed to unwrap?? The offending option … .

3D Displacement field derived from InSAR. Has good corellation with GPS and field observations. Key points - North of Kek fault; large horizontal dispalcements - Papatea fault block; isolated uplift and south motion Hamling et al (2017)

Hamling et al (2017)

Hamling et al (2017)

Activation all SS areas in North Island immediately after Kaikoura 14 th – 26 th Nov. EQ off east coast from 14 th - 26 th Nov Post EQ slip under Marlborough up to 0.5 m GeoNet website