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

▶
hamling et al 2017
SMART_READER_LITE
LIVE PREVIEW

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

May 30, 2023 135 likes •336 views

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

slide-1
SLIDE 1

The 2016 Mw 7.8 Kaikoura earthquake

Danielle Lindsay

slide-2
SLIDE 2

Hamling et al (2017)

slide-3
SLIDE 3

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)

slide-4
SLIDE 4

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)

slide-5
SLIDE 5

Kekerengu Fault

slide-6
SLIDE 6

Kekerengu Fault

slide-7
SLIDE 7

Mole hills Slickenlines 5 m deep fissures Fissures

slide-8
SLIDE 8

Papatea Block

slide-9
SLIDE 9

Papatea Block

slide-10
SLIDE 10

Papatea Block

Hamling et al (2017)

slide-11
SLIDE 11

Geodetic data

Campaign and continuous GPS Synthetic aperture radar (SAR)

slide-12
SLIDE 12

Hamling et al (2017)

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

slide-13
SLIDE 13

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.

slide-14
SLIDE 14

Sentinel 1A - 20161115 - 20161127

Filtered Phase (phasefilt_ll.grd) Correlation (Corr_ll.grd)

slide-15
SLIDE 15

Challenges...

  • Getting correct orbit files and data downloaded.
  • Switched to STRM 90m resolution as ran out of memory
  • Failed to unwrap??

The offending option….

slide-16
SLIDE 16

3D Displacement field derived from InSAR. Has good corellation with GPS and field

  • bservations.

Key points

  • North of Kek fault; large horizontal

dispalcements

  • Papatea fault block; isolated uplift

and south motion

Hamling et al (2017)

slide-17
SLIDE 17

Hamling et al (2017)

slide-18
SLIDE 18

Hamling et al (2017)

slide-19
SLIDE 19

GeoNet website

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