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1 THE UNCERTAINTIES IN ASSESSING THE IMPACT OF REGIONAL SEISMICITY AT THE WIL SITE Statement of Evidence by Jocelyn Karen Campbell
2
3 A CANTERBURY FAULTS coded by type
4 CHARACTERISTICS OF THRUST FAULTS IN CANTERBURY
5 COMPARISON OF OBSERVED AND PREDICTED SPECTRAL ACCELERATIONS Darfield and Christchurch Earthquakes at Christchurch Stations
6 Proposed revison of spectral shape factor standard current seismic consideration is not conservative for stiffer soils and over-conservative for soft soils Soil Class A Strong rock B Rock Spectral shape factor in NZS C Shallow soil D Deep soil E Very soft soil Revised shape factor
7 VERTICAL PGA common occurrence of vertical PGA close to, or exceeding, horizontal values
8 PROBABALISTIC SEISMIC HAZARD MODEL
9 HORORATA FAULT DATABASE HISTORY Source T L km length D Deg dip Dd Azimuth dipdirection Sr mm/yr slip rate M magnitude RI Yrs Recurrence interval Map ID Stirling1998 Not included in database Stirling2007 r ± ,800 BH1 45 Yetton r BH2 GNS >17,000? Litchfield 2013 Barrell Current online database r ± 0.1 BH ,000± 8,040 RH 2 15 n.e.3 n.e.3 RH
10 HORORATA FAULT ZONE and active structures in the 2010 Darfield earthquake (shading added to highlight areas of uplift during Darfield earthquake)
11 ACTIVE PROCESSES ALONG THE SOUTHERN HORORATA FAULT DURING THE DARFIELD EARTHQUAKE B A Growth distributed into blind footwall splays capped by actively growing anticlines. B Superposition of thrust and intersecting oblique slip fault accentuates uplift and combined elastic strain release with strong vertical acceleration
12 Basement Structures Malvern Hills R. Jongens
13 NORTHERN END OF HORORATA FAULT profile on south side of Waimakariri River showing typical fault propagation fault fold pairs (Fig Cc) and possible options for Hororata Fault style. C simple break to surface wedge and roof thrust fault propagation fold Jamison (1993)
14 PROJECTION OF THE HORORATA FAULT ZONE NORTH OF THE WAIMAKARIRI RIVER superimposed on well contrained earthquake locations Sept to Jan. 2012
15 TWO NEW FAULTS A A Darfield anticline broad rise east of township on SH73 may be over blind thrust or fault bend fold B B Eyre Fault Surface fault trace striking west north of West Eyreton. Analogue of Greendale Fault, reactivated inherited basement fault.
16 THRUST FAULT BENEATH BURNT HILL A B A LiDAR image of fault trace. View Hill Stream bed uplifted 3m C c M. Finnemore 2004 B Locality of MF2 seismic reflection line on Parish Road C Fault trace on seismic line dipping SW beneath Burnt Hill displacing base of gravels by approximately 125m
17 PROJECTION OF THE HORORATA FAULT ZONE NORTH OF THE WAIMAKARIRI RIVER superimposed on well contrained earthquake locations Sept to Jan. 2012
18 Satellite InSAR changes in elevation Darfield earthquake POINTS TO NOTE Black profile east of Hororata F shows differential displacement into footwall Strong displacement to north side of river associated with oblique slip Darfield anticline Warping over hanging wall to Eyre F on (green and magenta lines)indicates nw thrust motion of hanging wall Azimuth displacement in centimetres Confirms continuity of fault zone to north side of river
19 STRUCTURES NORTH OF WIL POND SITE
20 The Springbank Structure The topography follows the anticline profile of the seismic reflectors below Springbank fault does not reach the surface
21 HISTORICAL FAULT DATABASE ENTRIES
22 HISTORICAL FAULT DATABASE ENTRIES
23 HISTORICAL FAULT DATABASE ENTRIES
24
25 POSSIBLE CORRELATION OF RANGE FRONT EARTHQUAKES WITH SHORELINE PROGRADATION CYCLES?
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