Partnering for Impact · To see Wellington positioned to become a more resilient region through a...
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www.gns.cri.nz/ItsOurFault
Partnering for ImpactDerek Baxter – WCC (on behalf of the It’s Our Fault & GNS teams)
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To see Wellington positioned to become a
more resilient region through a comprehensive
study of the likelihood of large Wellington
earthquakes, the effects of these earthquakes,
and their impacts on humans and the built
environment
It’s Our Fault – The Goal
2
www.gns.cri.nz/ItsOurFault
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Wellington Fault
Conditional Probability of Rupture
(accounting for)
(Rhoades et al., BNZSEE 2011)
• Elapsed time since most recent rupture
Slightly younger than previously thought (~ 300 years ago)
• Timing of older ruptures
Slightly less frequent than previously thought (~ every 800-1000 years)
• Single event displacement size
Slightly larger than previously thought (~ 5 m per rupture)
• Slip rate
Slightly slower than previously thought (~ 6 mm/year)
• Rupture statistics of the Wellington-Wairarapa fault pair in a synthetic
earthquake catalogue derived from a physics-based numerical model
Rupture of nearby Wairarapa Fault “unloads” Wellington Fault
• Various recurrence-time models
Exponential, Lognormal, Weibull, inverse Gaussian
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Likelihood of rupture of
Wellington Fault within next 100 years
It’s Our Fault Result: ~ 10%Pre-It’s Our Fault: ~ 30%
(im
ag
e b
y D
. D
’Cru
z)
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Active Faults of Central NZ
For Comparison:
conditional probability of rupture of the
southern Alpine Fault
is ~30% in 50 years
(Rhoades & Van Dissen; Berryman et al.)
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Ground Shaking
Not all ground is
created equal &
how we deal with it
NZS1170 Spectral Shape Factors
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3 3.5Period T(s)
Sp
ectr
al
Sh
ap
e F
acto
r
Class A/B Rock
Class C Shallow Soil
Class D Deep or Soft Soil
D
C
B
D
B
C
D
C
B
Provide results in a
form that is usable for
those that will most use
the results
(Semmens et al.)
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Liquefaction
Susceptibility
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1855 Landslides in Wellington City area
► ‘Gold’s slide’ on the Hutt road – largest landslide Wellington area.
This large (c.300,000 m3) landslide from the
Wellington Fault scarp into Port Nicholson
blocked the road to Petone. The head scarp
(sc) and slide debris (sd) are still visible today
north of the BP Station (see below).
C E Gold’s painting,
1855 – Alexander
Turnbull Library.
Recent photo
Past
earthquakes
have generated
landslides in the
Wellington
region
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Mean Hutt Valley subsidence resulting from
Wellington Fault rupture
• Dark blue areas denote ground that has subsided below current sea-level
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Intergrating into district planning
• https://www.youtube.com/watch?v=kDUBjq9P6Ro
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How do we get better uptake
• Begin with the end in mind
• What is the end use of my research
• How do I want it to be used
• Publication or Implementation
• Format of the reports/outputs
• Storytelling is a source and a
conveyance.