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First direct evidence of a great earthquake in 1717, central Alpine Fault, New Zealand
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G. P. De Pascale1* and R. M. Langridge2
1. Department of Geological Sciences, University of Canterbury, PB 4800, Christchurch, New Zealand
2. GNS Science, PO Box 30-368, Lower Hutt, New Zealand
*E-mail: [email protected]
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TABLE DR1. RESULTS FROM RADIOCARBON DATING FROM GAUNT CREEK FAULT EXPOSURE
Calibrated age
2 sigma (cal Probability
for each 2
BP or
sigma
Material and
Calendar
Sample Exposure NZA Lab
Radiocarbon
range
Significance
years AD)
number
unit
#
Del 13C Age (yr. BP)
GCT-R2*
Older
Colluvial
Unit
36168
-26.5
2917 ± 30
2870-3100
3130-3140
94.3%
0.6%
GCT-R5
Alluvial
terrace
36169
-27.8
4823 ± 30
5330-5370
5460-5590
10.3%
84.8%
GCT-R8
Older
Colluvial
Unit
36205
-30.4
12731 ±45
14750-15530
95.0%
Top of
CW1
36252
-24.3
115 ± 15
1710-1720 AD
1810-1840 AD
1850-1870 AD
1880-1930 AD
7.6%
28.3%
5.4%
53.5%
GCT-R3F
Peat found in older
colluvial wedge. Dates
age of paleoearthquake
on the fault?
Peat found in alluvium of
alluvial terrace. Dates
the age of the terrace.
Peat at base of trench
below fault. Dates age
of a paleoearthquake on
the fault?
Peat growing at the
base of the fault scarp
post-dates the MRE.
Surface rupture at this
location post 1709.