Archive for ‘New Zealand Swarms’

February 6, 2014

Eketahuna, NI, NZ 6.3Mw, 20/01/2014 and aftershocks

20/01/2014 Mag 6.3Mw

Public ID:2014p051675 (geonet)
Universal Time: January 20 2014 at 2:52:45
NZ Daylight Time: Monday, January 20 2014 at 3:52:45 pm
Latitude, Longitude: -40.62, 175.85 (revised -40.6206 Long: 175.865)
Magnitude: 6.2298ML (revised from 6.1814ML)
Depth: 34.1797 km (revised from 33km)
Status: reviewed
Updated on: 29/01/2014 03:07:04
Location: 15 km east of Eketahuna
Intensity:severe
Location:15 km east of Eketahuna, North Island
Felt Reports: 9150
Energy Released: 136,681.056 Tonnes of TNT (6.3Mw)
Casualties: None
.
The focal mechanism shows it to be a normal fault earthquake. Where the crust is being pulled apart, “normal faulting” occurs, in which the overlying (hanging-wall) block moves down with respect to the lower (foot wall) block.
normal faulting model
Current depth and location estimates of this event place it below the interface between the subducting Pacific plate and overriding Australian plate. Maximum peak ground acceleration recorded by GeoNet instruments is about one quarter of the acceleration due to gravity (0.26 g). This measurement was recorded in Woodville. Relatively strong shaking was also recorded on the Kapiti Coast (e.g. up to 0.2 g in Paraparaumu) whereas accelerations recorded in Wellington city were less than 0.05 g. In comparison, ground motions recorded in Wellington during the recent Cook Strait earthquakes ranged up to 0.26g.

iris snzo webicorder graph 6.3Mw and aftershocks

iris snzo webicorder graph day 020
click image for full size version, opens in new tab/window

damage

The quake caused power cuts to 5600 customers on its electricity network, affecting customers in and around Eketahuna, Alfredton, Palmerston North, Feilding and as far north as Manaia in Taranaki. About 1600 were still without power by 7pm. Some cellphone coverage has also been affected.
3 people in Palmerston North have been taken to hospital after chemicals were knocked from shelves.
A large cliff slip near Mangaweka caused the Rangitikei River to change colour.
The jolt loosened a 20 ton chunk of rock from the 162m high Castle Rock at Castlepoint, killing 9 seals.
In Masterton, the 1925 Daniell’s building on Queen St had been evacuated and two other older buildings appeared to be damaged.
The quake was felt widely in Wellington. Hundreds of shoppers in Lower Hutt’s Queensgate Mall left the complex following the tremor, which left people screaming and ducking for cover as items fell from shelves.

GCMT MTS

GCMT MTS 6-3MW EKETAHUNA 2014-01-20

6.3Mw location

summary

mag6= 1
total energy released= 33,350.9588 TTNT (reviewed)

Networks estimates of location

summary

usgs, -40.6343, 175.7765, 6.2mww
emsc, -40.6365, 175.7742, 6.2Mw
gfzp, -40.56, 175.68, 6.2M
geonet, -40.6193, 175.8499, 6.1814ML

Geonet Reviewed Location


Fault shown (Pa Valley Fault)
total energy released= 33,350.9588 TTNT

aftershock maps

When data was downloaded from the Geonet database the events shown are categorized by the location “Wairarapa”, so some events have occurred outside the borders of the interactive maps below, zoom out to see these. The data has been reviewed 7/03/2014 and the maps reloaded with revised data.

6.3 aftershocks map – (0-1hr)

summary

mag1= 0 , mag2= 15 , mag3= 12
mag4= 3 , mag5= 0 , mag6= 1
total= 31
total energy released= 33,446.449 TTNT

6.3 a/s map – (0-3hrs cumulative)

summary

mag1= 3 , mag2= 62 , mag3= 20
mag4= 3 , mag5= 0 , mag6= 1
total= 89
total energy released= 33,466.911 TTNT

6.3 aftershocks map – (3-4hrs)

summary

mag1= 5 , mag2= 16 , mag3= 9
mag4= 0 , mag5= 0 , mag6= 0
total= 30
total energy released= 10.144 TTNT

6.3 a/s map – (0-4hrs cumulative)

summary

mag1= 8 , mag2= 78 , mag3= 29
mag4= 3 , mag5= 0 , mag6= 1
total= 119
total energy released= 33,477.055 TTNT

6.3 aftershocks map – (4-8hrs)

summary

mag1= 42 , mag2= 36 , mag3= 6
mag4= 0 , mag5= 0 , mag6= 0
total= 84
total energy released= 18.119 TTNT

6.3 a/s map – (0-8hrs cumulative)

summary

mag1= 50 , mag2= 114 , mag3= 35
mag4= 3 , mag5= 0 , mag6= 1
total= 203
total energy released= 33,495.174 TTNT

6.3 aftershocks map – (8-16hrs)

summary

mag1= 76 , mag2= 53 , mag3= 4
mag4= 4 , mag5= 0 , mag6= 0
total= 137
total energy released= 160.619 TTNT

6.3 a/s map – (0-16hrs cumulative)

summary

mag1= 126 , mag2= 167 , mag3= 39
mag4= 7 , mag5= 0 , mag6= 1
total= 340
total energy released= 33,655.793 TTNT

6.3 aftershocks map – (16-24hrs)

summary

mag1= 53 , mag2= 29 , mag3= 9
mag4= 2 , mag5= 0 , mag6= 0
total= 93
total energy released= 347.846 TTNT

6.3 a/s map – (0-1day cumulative)

summary

mag1= 179 , mag2= 196 , mag3= 48
mag4= 9 , mag5= 0 , mag6= 1
total= 433
total energy released= 34,003.638 TTNT

.

12 hour aftershock maps

6.3 aftershocks map – (24-36hrs)

summary

mag1= 106 , mag2= 46 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 154
total energy released= 7.319 TTNT

6.3 a/s map – (0-1.5days cumulative)

summary

mag1= 285 , mag2= 242 , mag3= 50
mag4= 9 , mag5= 0 , mag6= 1
total= 587
total energy released= 34,010.958 TTNT

6.3 aftershocks map – (36-48hrs)

summary

mag1= 57 , mag2= 40 , mag3= 5
mag4= 0 , mag5= 0 , mag6= 0
total= 102
total energy released= 9.495 TTNT

6.3 a/s map – (0-2days cumulative)

summary

mag1= 342 , mag2= 282 , mag3= 55
mag4= 9 , mag5= 0 , mag6= 1
total= 689
total energy released= 34,020.453 TTNT

6.3 aftershocks map – (48-60hrs)

summary

mag1= 70 , mag2= 30 , mag3= 1
mag4= 1 , mag5= 0 , mag6= 0
total= 102
total energy released= 28.481 TTNT

6.3 a/s map – (0-2.5days cumulative)

summary

mag1= 412 , mag2= 312 , mag3= 56
mag4= 10 , mag5= 0 , mag6= 1
total= 791
total energy released= 34,048.934 TTNT

6.3 aftershocks map – (60-72hrs)

summary

mag1= 31 , mag2= 25 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 58
total energy released= 4.280 TTNT

6.3 a/s map – (0-3days cumulative)

summary

mag1= 443 , mag2= 337 , mag3= 58
mag4= 10 , mag5= 0 , mag6= 1
total= 849
total energy released= 34,053.213 TTNT

3 day graphs

Preliminary data showed an initial gap of 2hrs and 40 minutes between the Mainshock and the first aftershock, on review this gap has been filled. The first aftershock was a 4.0188ML quake 3 minutes 46 seconds after the Mainshock 8.8km to the south west of the main shock, south west of Alfredton, on the east side of the Pa Valley Fault
At this point the differences between preliminary data and reviewed data can be easier seen on a graph.

72 hour timeline graph

preliminary data
Eketahuna 6.3Mw 72hr timeline graph, using prelimianry data
click on image for larger version

72 hour timeline graph

reviewed data
Eketahuna 6.3Mw 72hr timeline graph, using reviewed data
click on image for larger version

6.3 aftershocks map – (72-84hrs)

summary

mag1= 43 , mag2= 14 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 57
total energy released= 1.324 TTNT

6.3 a/s map – (0-3.5days cumulative)

summary

mag1= 486 , mag2= 351 , mag3= 58
mag4= 10 , mag5= 0 , mag6= 1
total= 906
total energy released= 34,054.537 TTNT

6.3 aftershocks map – (84-96hrs)

summary

mag1= 64 , mag2= 23 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 87
total energy released= 1.938 TTNT

6.3 a/s map – (0-4days cumulative)

summary

mag1= 550 , mag2= 374 , mag3= 58
mag4= 10 , mag5= 0 , mag6= 1
total= 993
total energy released= 34,056.475 TTNT

.

24 hour aftershock maps

6.3 aftershocks map – (4-5days)

summary

mag1= 80 , mag2= 30 , mag3= 4
mag4= 1 , mag5= 0 , mag6= 0
total= 115
total energy released= 31.555 TTNT

6.3 a/s map – (0-5days cumulative)

summary

mag1= 630 , mag2= 404 , mag3= 62
mag4= 11 , mag5= 0 , mag6= 1
total= 1108
total energy released= 34,088.030 TTNT

6.3 aftershocks map – (5-6days)

summary

mag1= 83 , mag2= 21 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 105
total energy released= 2.971 TTNT

6.3 a/s map – (0-6days cumulative)

summary

mag1= 713 , mag2= 425 , mag3= 63
mag4= 11 , mag5= 0 , mag6= 1
total= 1213
total energy released= 34,091.001 TTNT

6.3 aftershocks map – (6-7days)

summary

mag1= 71 , mag2= 18 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 89
total energy released= 2.074 TTNT

6.3 a/s map – (0-7days cumulative)

summary

mag1= 784 , mag2= 443 , mag3= 63
mag4= 11 , mag5= 0 , mag6= 1
total= 1302
total energy released= 34,093.075 TTNT

7 day timeline graph

Eketahuna 6.3Mw 7days timeline graph
click on image for larger version
.

Daily aftershock maps, Cumulative map every 7 days

6.3 aftershocks map – (7-8days)

summary

mag1= 60 , mag2= 21 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 83
total energy released= 4.816 TTNT

6.3 aftershocks map – (8-9days)

summary

mag1= 64 , mag2= 13 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 78
total energy released= 3.674 TTNT

6.3 aftershocks map – (9-10days)

summary

mag1= 73 , mag2= 18 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 92
total energy released= 14.819 TTNT

6.3 aftershocks map – (10-11days)

summary

mag1= 53 , mag2= 14 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 67
total energy released= 0.961 TTNT

6.3 aftershocks map – (11-12days)

summary

mag1= 42 , mag2= 12 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 55
total energy released= 3.135 TTNT

6.3 aftershocks map – (12-13days)

summary

mag1= 37 , mag2= 11 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 50
total energy released= 7.113 TTNT

6.3 aftershocks map – (13-14days)

summary

mag1= 44 , mag2= 5 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 49
total energy released= 0.391 TTNT

6.3 a/s map – (0-14days cumulative)

summary

mag1= 1157 , mag2= 537 , mag3= 70
mag4= 11 , mag5= 0 , mag6= 1
total= 1776
total energy released= 34,127.984 TTNT

14 day timeline graph

preliminary data
Eketahuna 6.3Mw 14days timeline graph preliminary
click on image for larger version

14 day timeline graph

reviewed data
Eketahuna 6.3Mw 14days timeline graph reviewed
click on image for larger version

6.3 aftershocks map – (14-15days)

summary

mag1= 43 , mag2= 11 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 56
total energy released= 6.963 TTNT

6.3 aftershocks map – (15-16days)

summary

mag1= 30 , mag2= 15 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 46
total energy released= 14.136 TTNT

6.3 aftershocks map – (16-17days)

summary

mag1= 31 , mag2= 10 , mag3= 2
mag4= 0 , mag5= 0 , mag6= 0
total= 43
total energy released= 2.872 TTNT

6.3 aftershocks map – (17-18days)

summary

mag1= 34 , mag2= 5 , mag3= 0
mag4= 0 , mag5= 0 , mag6= 0
total= 39
total energy released= 0.599 TTNT

6.3 aftershocks map – (18-19days)

summary

mag1= 39 , mag2= 4 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 44
total energy released= 1.259 TTNT

6.3 aftershocks map – (19-20days)

summary

mag1= 34 , mag2= 10 , mag3= 1
mag4= 0 , mag5= 0 , mag6= 0
total= 45
total energy released= 1.720 TTNT

6.3 aftershocks map – (20-21days)

summary

mag1= 24 , mag2= 12 , mag3= 3
mag4= 0 , mag5= 0 , mag6= 0
total= 39
total energy released= 11.737 TTNT

6.3 a/s map – (0-21days cumulative)

summary

mag1= 1392 , mag2= 604 , mag3= 80
mag4= 11 , mag5= 0 , mag6= 1
total= 2088
total energy released= 34,167.272 TTNT