2011 Townsend Fault 5.2 Canterbury

Main Event and Aftershocks

On 29th April 2011 UTC (Apr 30th 2011 at 7:08 am NZST) a Moderate quake hit the eastern foothills of the Southern Alps north of Oxford, Canterbury.
The quake was felt throughout the central Canterbury region from Hanmer Springs in the north to Timaru in the south, as well as on the West Coast from Westport down to Okarito, and several reports from as far afield as Dunedin and Nelson.
The highest Intensity was MM6, Slightly Damaging, in Fernside, Oxford, Riccarton and Springfield.

After the recent large Canterbury earthquakes of Sept 3rd 2010 at Darfield (7.1) and Feb 22nd 2011 (6.3) one would tend to think this quake at Lees Valley is just another aftershock, but this was in fact a quake on another Faultline altogether, the Townsend Fault.
There is a possibility that the Darfield 7.1 and the Lyttelton 6.3 put stress on the Townsend Fault and caused this failure on April 29th.

Here I have gone back and checked the data for the fault and surrounding area, north and south of Oxford Hill to see what the history of the Fault is.
The Search area is Lat -43.135245 to Lat -43.236639 and Long 171.956520 to 172.171753


The fault to the south of Oxford Hill is called the Coopers Creek Fault.
Both Faults join up to the Glen Tui Fault to the east, the Lees Valley Fault to the northeast and the Porters Pass Fault to the west.

April 29th + 5days

In the 5 days since the 5.178ML quake there have been 8 aftershocks in the immediate area of Black Hill and the Townsend River.
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
5.178, 2011/4/29 19:8:4, -43.17515, 172.00777, 9, 3505099
2.248, 2011/5/1 23:14:28, -43.18329, 172.01654, 8, 3506146
2.531, 2011/5/2 15:32:7, -43.18764, 172.0106, 5, 3506474
2.262, 2011/5/2 16:7:22, -43.16945, 172.01801, 9, 3506483
2.669, 2011/5/3 0:1:1, -43.16917, 172.01764, 8, 3506628
2.923, 2011/5/3 14:56:2, -43.17444, 172.01604, 6, 3506971
3.266, 3507307, -43.16549, 172.02834, 2011/5/4 7:37:27, 7
3.157, 3507311, -43.21566, 172.02118, 2011/5/4 7:44:15, 13
2.542, 3507358, -43.18343, 171.98975, 2011/5/4 10:1:42, 9

T/CC Faults activity from the Darfield Sept 3 up to the 5.2

The map below shows the earthquakes in the Townsend/Coopers Creek Faults area in the period since the 2010 Sept 3rd 7.1 Darfield earthquake, on the new Greendale Fault to the south.
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
2.738, 2010/9/5 14:20:18, -43.23072, 172.0629, 5, 3367239
2.989, 2010/9/13 6:7:21, -43.216, 172.08458, 9, 3371451
2.431, 2010/9/13 16:23:37, -43.22586, 172.02829, 11, 3371668
3.165, 2010/9/14 2:13:19, -43.20278, 172.08305, 10, 3371867
2.803, 2010/9/22 10:3:14, -43.22447, 172.02209, 7, 3376440
3.57, 2010/9/24 11:33:2, -43.16637, 172.10735, 5, 3377634
3.362, 2010/9/24 12:28:10, -43.17266, 172.11551, 5, 3377655
2.882, 2010/9/24 14:38:4, -43.17824, 172.10938, 5, 3377713
2.499, 2010/9/24 22:19:44, -43.17453, 172.11096, 5, 3377903
2.906, 2010/9/28 14:55:25, -43.17492, 172.11691, 5, 3379823
2.709, 2010/9/29 1:0:44, -43.17228, 172.10509, 5, 3380030
2.799, 2010/9/29 15:54:24, -43.16797, 172.01976, 11, 3380345
2.99, 2010/10/3 7:1:50, -43.18231, 172.09843, 5, 3382124
2.291, 2010/10/6 12:24:35, -43.16845, 172.0442, 5, 3383717
2.194, 2010/10/7 20:13:37, -43.1913, 172.05879, 5, 3384384
3.697, 2010/10/13 8:47:55, -43.16586, 172.04312, 5, 3388485
3.347, 2010/10/14 0:44:20, -43.22258, 172.10086, 7, 3388797
2.479, 2010/10/14 7:18:45, -43.16426, 172.07144, 5, 3389045
2.868, 2010/10/15 5:28:39, -43.16764, 172.03044, 5, 3389506
2.861, 2010/10/15 6:21:38, -43.21048, 172.14262, 5, 3389523
2.747, 2010/10/22 22:12:5, -43.18782, 172.0975, 5, 3394034
2.682, 2010/10/22 22:14:50, -43.18253, 172.08772, 5, 3394035
3.089, 2010/10/23 2:40:43, -43.2113, 172.10234, 5, 3394126
2.528, 2010/10/23 2:58:31, -43.22918, 172.09027, 6, 3394131
2.463, 2010/10/23 15:53:35, -43.17168, 172.06923, 5, 3394382
3.376, 2010/10/25 0:6:52, -43.1951, 172.12842, 5, 3395024
3.212, 2010/10/25 21:2:19, -43.22815, 172.01637, 5, 3395430
2.658, 2010/10/26 14:48:51, -43.1583, 172.04286, 6, 3395815
2.402, 2010/10/27 1:39:1, -43.16282, 172.07275, 5, 3396054
4.599, 2010/11/6 13:52:4, -43.21131, 172.06297, 9, 3403219
3.147, 2010/11/6 14:6:38, -43.22608, 172.09723, 7, 3403223
2.011, 2010/11/6 14:33:26, -43.22401, 172.08292, 5, 3403230
3.539, 2010/11/6 15:53:8, -43.22257, 172.08574, 5, 3403256
2.452, 2010/11/6 16:21:17, -43.21866, 172.09846, 5, 3403264
2.635, 2010/11/6 22:8:39, -43.22303, 172.09802, 5, 3403382
2.977, 2010/11/7 13:39:7, -43.22884, 172.09732, 7, 3403698
2.392, 2010/11/7 14:54:16, -43.23214, 172.1059, 5, 3403726
2.38, 2010/11/8 0:50:23, -43.22004, 172.08321, 5, 3403941
2.578, 2010/11/8 17:17:51, -43.22981, 172.09015, 6, 3404285
3.757, 2010/11/11 20:44:26, -43.20081, 172.11057, 8, 3405904
2.37, 2010/11/12 15:16:10, -43.22641, 172.08768, 6, 3406281
4.054, 2010/11/14 9:0:39, -43.22129, 172.09645, 8, 3407140
3.361, 2010/11/15 12:8:16, -43.22358, 172.04555, 7, 3407710
3.037, 2010/11/15 17:31:57, -43.22254, 172.03578, 8, 3435310
3.189, 2010/11/16 3:53:30, -43.22866, 172.02277, 5, 3408031
2.593, 2010/11/17 18:3:41, -43.21441, 172.11958, 6, 3408821
2.722, 2010/11/28 7:44:15, -43.23583, 172.03226, 7, 3414009
2.322, 2010/11/28 12:11:47, -43.22403, 172.03717, 5, 3414100
2.901, 2010/12/1 0:2:17, -43.21903, 172.08864, 5, 3421817
3.356, 2010/12/4 10:15:38, -43.22297, 172.0955, 9, 3416928
2.504, 2011/1/4 10:37:28, -43.23396, 172.09608, 5, 3441567
2.483, 2011/1/11 9:0:2, -43.22306, 172.09029, 5, 3446049
2.382, 2011/1/23 8:26:17, -43.19037, 172.05774, 5, 3454087
2.466, 2011/1/31 15:2:4, -43.17585, 172.08244, 5, 3458090
4.448, 2011/2/3 18:32:51, -43.15667, 172.01534, 8, 3459803
3.428, 2011/2/3 18:38:36, -43.18559, 172.02718, 10, 3459804
2.853, 2011/2/3 18:54:31, -43.18016, 172.00259, 9, 3459810
2.475, 2011/2/3 19:0:41, -43.19071, 172.00058, 12, 3459812
2.787, 2011/2/3 21:53:30, -43.18026, 172.01791, 11, 3459872
3.209, 2011/2/4 23:52:7, -43.17881, 172.02379, 9, 3460334
2.989, 2011/2/4 23:54:6, -43.17234, 172.03212, 9, 3460335
2.619, 2011/2/7 12:48:46, -43.19123, 172.01559, 12, 3461525
2.809, 2011/2/13 14:27:41, -43.16507, 171.96602, 5, 3464455
2.776, 2011/2/20 4:1:30, -43.18829, 172.01469, 10, 3468010
3.143, 2011/2/25 23:18:57, -43.1801, 172.00948, 9, 3470570
2.233, 2011/2/27 12:12:23, -43.23382, 172.01828, 7, 3504321
3.452, 2011/3/6 21:55:7, -43.20822, 172.0773, 5, 3474836
2.768, 2011/3/20 6:26:30, -43.18726, 172.01807, 8, 3481433
2.365, 2011/3/21 18:34:43, -43.18466, 172.02437, 10, 3482215
2.429, 2011/3/26 9:19:9, -43.21618, 172.11671, 5, 3485826
2.612, 2011/3/30 9:53:29, -43.20152, 172.00395, 5, 3489399
2.252, 2011/4/7 7:21:33, -43.21838, 172.06087, 8, 3493607
3.632, 2011/4/13 17:39:9, -43.23319, 172.08875, 10, 3496544
2.993, 2011/4/14 0:12:29, -43.20912, 172.08264, 5, 3496695
2.997, 2011/4/14 1:37:16, -43.21268, 172.0891, 7, 3497144
3.023, 2011/4/20 3:33:3, -43.21449, 172.07645, 8, 3499916
2.414, 2011/4/20 4:23:43, -43.17382, 172.05865, 8, 3499934
3.079, 2011/4/20 5:56:58, -43.21709, 172.0818, 7, 3499964
3.069, 2011/4/25 22:33:32, -43.19896, 172.04066, 9, 3502786

T/CC Faults activity 12 months prior to the Darfield Sept 3

The map below shows the earthquakes in the Townsend/Coopers Creek Faults area in the period 12 months prior to the 2010 Sept 3rd 7.1 Darfield earthquake
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
3.247, 2009/9/13 2:38:4, -43.18122, 172.05569, 12, 3153282
2.263, 2009/9/16 16:0:15, -43.19446, 171.99078, 12, 3158426
2.091, 2009/9/18 12:17:19, -43.18097, 172.03781, 10, 3159720
3.428, 2009/9/24 1:17:19, -43.17733, 172.05661, 9, 3158471
2.281, 2009/10/20 21:23:52, -43.18549, 171.99147, 12, 3171521
2.1, 2009/11/19 21:2:14, -43.17599, 172.06415, 9, 3186317
1.92, 2009/12/18 23:59:27, -43.19021, 172.13449, 5, 3216922
2.181, 2009/12/27 13:20:7, -43.15974, 172.00905, 12, 3214793
2.211, 2010/1/29 18:18:26, -43.17459, 172.06215, 5, 3249166
2.331, 2010/6/5 20:53:12, -43.20218, 171.96835, 11, 3318565
2.511, 2010/6/23 18:34:55, -43.18106, 171.98242, 2, 3328246
2.644, 2010/7/31 20:48:3, -43.18393, 172.02652, 10, 3348491
2.736, 2010/8/3 6:14:46, -43.21399, 172.07654, 10, 3349729
3.261, 2010/8/27 0:5:3, -43.2097, 171.99074, 5, 3362156
2.669, 2010/8/27 0:44:57, -43.21064, 172.01686, 5, 3362167
2.672, 2010/8/27 11:3:49, -43.20196, 171.98798, 8, 3362380

T/CC Faults activity Sept 2005 to Sept 2009

The map below shows the earthquakes in the Townsend/Coopers Creek Faults area in the period 5 years prior to Sept 3rd 2009
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
2.82, 2005/9/28 13:28:10, -43.16864, 172.08533, 12, 2465781
2.693, 2005/11/13 7:51:39, -43.18329, 172.05333, 12, 2486081
2.689, 2005/11/24 15:12:35, -43.17738, 172.05453, 12, 2491152
2.351, 2006/2/25 17:10:28, -43.19648, 172.12296, 12, 2530743
2.312, 2006/3/4 11:55:50, -43.22969, 172.14781, 5, 2533920
2.273, 2006/5/6 14:21:20, -43.13886, 172.1167, 33, 2564371
2.661, 2006/5/28 0:15:7, -43.1748, 172.17122, 5, 2811965
3.417, 2007/7/31 7:7:35, -43.21668, 172.0426, 5, 2773651
2.235, 2008/1/3 7:48:37, -43.14214, 171.99658, 5, 2845659
2.131, 2008/4/22 23:56:41, -43.17408, 172.05386, 12, 2898422
2.604, 2008/12/7 6:53:12, -43.2196, 172.10567, 12, 3015037
4.085, 2009/3/4 14:41:24, -43.21406, 172.15628, 5, 3054325
3.334, 2009/3/4 14:44:28, -43.21132, 172.16747, 5, 3054326

T/CC Faults activity Sept 1995 to Sept 2005

In the 10 years prior to that, 1995/09/03 to 2005/09/02, the following events occured in the Townsend/Coopers Creek Faults area
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
3.378, 1995/10/4 17:15:24, -43.20707, 172.14612, 12, 853948
2.493, 1995/10/7 13:30:14, -43.21355, 172.13167, 12, 853975
2.143, 1995/11/24 6:46:1, -43.17758, 172.13255, 5, 773218
2.209, 1995/11/25 10:46:26, -43.23515, 172.16579, 5, 793024
2.011, 1995/11/26 15:31:11, -43.15581, 172.05511, 5, 780700
3.573, 1996/4/10 14:31:22, -43.21243, 171.98094, 12, 963188
2.543, 1997/1/14 6:32:34, -43.18771, 172.15669, 5, 1089600
3.129, 1997/1/16 8:38:46, -43.18417, 172.03381, 5, 1073467
3.363, 1997/3/18 11:47:7, -43.19715, 172.14145, 5, 1100374
3.182, 1997/5/29 0:9:56, -43.22231, 172.01317, 12, 1136106
2.879, 1999/3/11 18:57:13, -43.19964, 172.05095, 5, 1372962
3.538, 1999/4/29 16:52:35, -43.20359, 172.05246, 12, 1388172
2.358, 1999/6/23 13:27:49, -43.17206, 172.02351, 5, 1408670
2.843, 2000/3/2 15:41:32, -43.1734, 172.15393, 12, 1493900
2.974, 2000/6/11 2:48:32, -43.22817, 171.96614, 12, 1532251
2.522, 2001/2/6 9:24:15, -43.21655, 172.09561, 12, 1689940
1.966, 2001/6/10 22:8:39, -43.16286, 172.04732, 12, 1743882
2.582, 2001/7/1 7:41:3, -43.15845, 172.12242, 12, 1847179
3.033, 2001/12/2 4:46:8, -43.18885, 172.05948, 5, 1824034
2.592, 2002/5/29 5:8:41, -43.13663, 172.02322, 12, 1883254
2.505, 2002/7/9 3:12:11, -43.18947, 172.056, 12, 1896555
2.598, 2002/7/21 5:20:19, -43.15427, 172.12914, 27, 2024840
2.726, 2003/2/26 23:39:33, -43.17404, 172.15523, 12, 2031439
2.925, 2003/7/8 10:11:56, -43.17515, 172.16434, 12, 2084566
2.444, 2003/7/8 14:36:3, -43.17424, 172.07713, 29, 2084630
2.786, 2004/3/3 4:41:40, -43.22197, 172.12158, 29, 2194083
2.635, 2004/7/16 1:32:37, -43.17069, 172.16678, 5, 2265416
2.562, 2004/8/8 13:28:39, -43.17676, 172.06905, 5, 2277314
3.864, 2005/2/16 21:14:14, -43.17516, 172.05302, 11, 2365912
2.799, 2005/3/29 5:50:59, -43.2324, 172.10924, 12, 2383345
3.12, 2005/6/28 7:30:7, -43.2248, 172.09126, 12, 2424244
2.26, 2005/8/28 6:33:19, -43.18928, 172.14999, 33, 2452410

T/CC Faults activity 1971 to 1995

In the search back to 1895 (100 years prior to the last period) the data starts on August 14th 1971.
Map shows events 1971/08/14 to 1995/09/02
MAG, DATE/TIME UTC, LAT, LONG, DEPTH, REF
3.2, 1971/8/14 0:15:52, -43.21, 172.13, 12, 1553788
3.571, 1976/4/9 12:54:10, -43.2, 172.11, 12, 1557373
4.1, 1984/7/7 18:33:44, -43.16, 171.98, 12, 1565468
4.93, 1984/8/6 16:2:58, -43.22, 172.14, 12, 1565524
3.527, 1984/8/6 17:53:50, -43.22, 172.08, 12, 1565525
3.482, 1984/8/6 18:43:43, -43.16, 172.14, 12, 1565526
4.1, 1984/8/6 19:2:31, -43.19, 172.10001, 12, 1565527
5.238, 1986/7/11 23:3:32, -43.23, 172.14, 12, 1568161
3.829, 1987/8/16 7:10:39, -43.23017, 172.13235, 12, 62166
3.343, 1987/9/20 12:24:17, -43.15731, 171.99342, 5, 76242
2.642, 1990/5/11 23:50:49, -43.1784, 172.08354, 8, 125506
2.795, 1990/7/7 4:36:3, -43.18344, 172.01627, 5, 140268
4.177, 1990/8/22 17:7:9, -43.16786, 172.16096, 12, 150831
3.034, 1990/8/22 17:9:42, -43.18057, 172.16678, 12, 153388
2.221, 1990/8/22 17:13:18, -43.19494, 172.11368, 5, 152686
2.498, 1990/11/2 9:22:3, -43.1907, 172.13512, 5, 171854
3.704, 1991/3/21 3:43:17, -43.23249, 172.0955, 14, 213650
3.399, 1991/9/18 1:23:55, -43.22541, 172.0018, 8, 259645
2.954, 1991/11/9 14:22:13, -43.16406, 172.0155, 9, 274200
2.828, 1991/12/21 1:15:29, -43.23181, 172.02495, 16, 287679
2.683, 1992/6/4 3:32:28, -43.18288, 172.16849, 33, 339303
2.906, 1992/10/22 16:51:17, -43.17161, 172.05397, 12, 378478
3.858, 1992/11/1 11:58:41, -43.20755, 172.14522, 14, 379163
2.716, 1992/11/20 15:45:39, -43.20456, 172.16902, 12, 386954
2.559, 1992/12/24 1:48:55, -43.18224, 172.06508, 5, 396488
2.915, 1993/8/28 10:32:10, -43.20797, 172.14987, 12, 480521
2.342, 1993/10/31 14:51:33, -43.1908, 172.0943, 5, 503869
2.421, 1993/11/27 8:24:37, -43.20002, 172.0788, 5, 519179
2.284, 1994/2/21 2:16:35, -43.21251, 172.03729, 5, 566871
2.57, 1994/4/8 12:17:43, -43.2257, 172.03708, 12, 587016
3.033, 1994/5/11 21:39:34, -43.1965, 172.01161, 12, 599244
2.524, 1995/4/13 6:14:56, -43.17247, 172.16785, 12, 786520

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