Earthquake with magnitude of Mwp 6.5 on date 31-08-2021 and time 02:52:57 (UTC) in region Kermadec Islands, New Zealand [Sea: New Zealand]

A magnitude Mwp 6.5 earthquake occured in region: Kermadec Islands, New Zealand [Sea: New Zealand], on

  • 31-08-2021 02:52:57 (UTC)
  • 31-08-2021 04:52:57 (UTC +02:00) Italian time
  • 31-08-2021 15:52:57 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -29.637, -177.403 at 65 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity
Seismic hazard
Shakemap

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and adjourned progressively as more data become available. See http://shakemap.rm.ingv.it/ for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows This map shows the distribution of peak ground acceleration expressed as per cent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
mb 5.5
Mwp 6.5

Mwpd 6.6
2021-08-31
02:52:57
-29.6367 -177.403 65 2021-08-31
03:15:08
Sala Sismica INGV-Roma 94845501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 02:52:57
Latitude -29.6367
Longitude -177.4030
Depth (km) 65 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 94845501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 13831
Semi-minor axis of confidence ellipse (meter) 11792
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 57
Circular confidence region, given by single value of horizontal uncertainty (meter) 13761.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55.982
Number of associated phases, regardless of their use for origin computation 89
Number of defining phases 89
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.14016
Epicentral distance of station closest to the epicenter (degree) 9.42054
Epicentral distance of station farthest from the epicenter (degree) 97.85119
Number of stations at which the event was observed 89
Number of stations from which data was used for origin computation 89
Magnitudes information

Mwpd:6.6

Field Value
Value 6.6
Uncertainty 0.1
Num. used stations 54
Type of magnitude Mwpd
Reference to an origin 94845501
Agency INGV
Autore early-est_ee1.2.4
Time of creation (UTC) 2021-08-31 03:15:08

Mwp:6.5

Field Value
Value 6.5
Uncertainty 0.1
Num. used stations 63
Type of magnitude Mwp
Reference to an origin 94845501
Agency INGV
Autore early-est_ee1.2.4
Time of creation (UTC) 2021-08-31 03:15:08

mb:5.5

Field Value
Value 5.5
Uncertainty 0.1
Num. used stations 90
Type of magnitude mb
Reference to an origin 94845501
Agency INGV
Autore early-est_ee1.2.4
Time of creation (UTC) 2021-08-31 03:15:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GT.LPAZ.BHZ.00 2021-08-31T03:06:31.58 10.0 positive automatic P 114 97.8512 4.2246 0.0845007
IU.COLA.BHZ.00 2021-08-31T03:06:20.00 10.0 positive automatic P 12 97.2699 1.31 0.0864856
CX.MNMCX.BHZ. 2021-08-31T03:06:15.00 10.0 positive automatic P 115 95.1058 0.340299 0.0884563
US.SDCO.BHZ.00 2021-08-31T03:06:13.23 10.0 positive automatic P 49 95.1137 0.269315 0.0884416
US.NEW.BHZ.00 2021-08-31T03:06:10.28 10.0 positive automatic P 35 94.7083 -0.514846 0.0922762
AT.TTA.BHZ. 2021-08-31T03:06:07.70 10.0 positive automatic P 10 94.1267 -0.531581 0.0949483
US.HWUT.BHZ.00 2021-08-31T03:06:05.75 10.0 positive automatic P 43 93.5698 0.00301578 0.0326373
US.HLID.BHZ.00 2021-08-31T03:06:03.68 10.0 positive automatic P 40 93.1338 -0.0563385 0.0500108
IU.ANMO.BHZ.00 2021-08-31T03:06:03.05 10.0 positive automatic P 51 92.8996 -1.08713 0.0981613
US.MVCO.BHZ.00 2021-08-31T03:06:02.93 10.0 positive automatic P 48 92.8533 0.419284 0.0898068
IU.MA2.BHZ.00 2021-08-31T03:06:01.87 10.0 positive automatic P 344 93.0014 0.0554445 0.0968075
CN.BBB.BHZ. 2021-08-31T03:06:00.93 10.0 positive automatic P 28 92.4643 -0.399366 0.093583
US.HAWA.BHZ.00 2021-08-31T03:05:59.95 10.0 positive automatic P 36 92.2441 -0.00299784 0.101961
US.BMO.BHZ.00 2021-08-31T03:05:59.80 10.0 positive automatic P 38 92.3786 -0.340838 0.0981174
US.DUG.BHZ.00 2021-08-31T03:05:58.60 10.0 positive automatic P 44 91.959 0.343626 0.0990149
US.MNTX.BHZ.00 2021-08-31T03:05:57.98 10.0 positive automatic P 54 91.8049 0.612974 0.0993479
RM.SLV.BHZ. 2021-08-31T03:05:55.62 10.0 positive automatic P 294 91.2019 -0.202295 0.0920986
US.ELK.BHZ.00 2021-08-31T03:05:53.13 10.0 positive automatic P 42 90.8709 -0.219798 0.105066
US.NLWA.BHZ.00 2021-08-31T03:05:53.78 10.0 positive automatic P 33 90.8111 -0.0862038 0.103952
US.WUAZ.BHZ.00 2021-08-31T03:05:50.33 10.0 positive automatic P 48 89.9875 -0.321478 0.136388
US.WVOR.BHZ.00 2021-08-31T03:05:49.78 10.0 positive automatic P 39 90.0544 -0.400797 0.104463
II.KDAK.BHZ.00 2021-08-31T03:05:48.02 10.0 positive automatic P 13 89.8687 -0.533101 0.102484
II.HOPE.BHZ.00 2021-08-31T03:05:47.82 10.0 positive automatic P 158 89.5584 0.568016 0.0975867
IU.COR.BHZ.00 2021-08-31T03:05:46.02 10.0 positive automatic P 35 89.0866 0.266089 0.0692621
NN.PRN.HHZ. 2021-08-31T03:05:45.42 10.0 positive automatic P 45 88.8503 0.34495 0.210501
WA.ZON.HHZ. 2021-08-31T03:05:44.26 10.0 positive automatic P 126 88.7932 0.867128 0.101482
MX.HPIG.BHZ. 2021-08-31T03:05:44.36 10.0 positive automatic P 58 88.9192 0.20539 0.0940848
C.GO04.BHZ. 2021-08-31T03:05:41.10 10.0 positive automatic P 124 88.0578 0.952156 0.0716816
C1.CO02.BHZ. 2021-08-31T03:05:37.00 10.0 positive automatic P 125 87.345 0.404217 0.102596
G.PEL.BHZ.00 2021-08-31T03:05:32.90 10.0 positive automatic P 127 86.5053 -0.928115 0.127074
GE.GSI.BHZ. 2021-08-31T03:05:31.77 10.0 positive automatic P 274 86.3178 -0.332364 0.112838
II.PFO.BHZ.00 2021-08-31T03:05:28.72 10.0 positive automatic P 47 85.5346 -0.137364 0.115796
PS.PSI.BHZ. 2021-08-31T03:05:27.66 10.0 positive automatic P 275 85.8424 -0.952128 0.189726
IU.PET.BHZ.00 2021-08-31T03:05:25.02 10.0 positive automatic P 346 85.2493 0.119227 0.205128
BK.SAO.BHZ.00 2021-08-31T03:05:23.82 10.0 positive automatic P 42 84.6113 -0.0132244 0.133635
IU.YSS.BHZ.00 2021-08-31T03:05:23.50 10.0 positive automatic P 334 84.5956 0.882845 0.163788
II.EFI.BHZ.00 2021-08-31T03:05:14.40 10.0 positive automatic P 147 82.8823 -0.943472 0.102772
C.GO06.BHZ. 2021-08-31T03:05:13.40 10.0 positive automatic P 132 82.4555 1.3237 0.123158
GT.PLCA.BHZ.00 2021-08-31T03:05:12.65 10.0 positive automatic P 133 82.4263 -0.41204 0.123245
JP.JTU.BHZ. 2021-08-31T03:05:05.55 10.0 positive automatic P 318 81.4474 -1.03459 0.214099
G.PAF.BHZ.00 2021-08-31T03:05:05.05 10.0 positive automatic P 218 80.8159 1.82655 0.131259
IU.ADK.BHZ.00 2021-08-31T03:05:05.85 10.0 positive automatic P 0 81.5179 -0.439068 0.153747
C1.LL02.BHZ. 2021-08-31T03:05:00.40 10.0 positive automatic P 135 80.2948 -0.0919978 0.129876
G.COYC.BHZ.00 2021-08-31T03:04:54.25 10.0 positive automatic P 137 78.905 -0.0744484 0.137694
JP.JSU.BHZ. 2021-08-31T03:04:50.25 10.0 positive automatic P 317 78.6757 -0.63074 0.174991
GE.SNAA.BHZ. 2021-08-31T03:04:49.91 10.0 positive automatic P 178 78.6173 -2.4333 0.0432306
IU.MAJO.BHZ.00 2021-08-31T03:04:47.37 10.0 positive automatic P 325 78.1959 -0.628401 0.124682
JP.JGF.BHZ. 2021-08-31T03:04:46.05 10.0 positive automatic P 324 77.892 -0.327435 0.261385
G.INU.BHZ.00 2021-08-31T03:04:45.11 10.0 positive automatic P 323 77.863 -0.756969 0.102335
C1.MG02.BHZ. 2021-08-31T03:04:42.23 10.0 positive automatic P 144 76.7135 1.49382 0.142287
JP.JSG.BHZ. 2021-08-31T03:04:40.45 10.0 positive automatic P 324 76.7455 -0.464464 0.0745521
JP.JOW.BHZ. 2021-08-31T03:04:40.30 10.0 positive automatic P 312 76.7542 -1.1814 0.225275
JP.JHJ2.BHZ. 2021-08-31T03:04:28.30 10.0 positive automatic P 324 74.6807 -1.35658 0.0709449
MY.SBM.BHZ. 2021-08-31T03:04:26.97 10.0 positive automatic P 282 74.3099 0.0243859 0.283731
AU.MAW.BHZ. 2021-08-31T03:04:18.43 10.0 positive automatic P 200 72.9596 -1.62524 0.298079
MY.LDM.BHZ. 2021-08-31T03:04:05.37 10.0 positive automatic P 288 70.5158 -0.404849 0.165096
JP.JCJ.BHZ. 2021-08-31T03:03:51.25 10.0 positive automatic P 322 68.6557 -1.71132 0.2074
GE.JAGI.BHZ. 2021-08-31T03:03:42.17 10.0 positive automatic P 273 67.1243 0.0572456 0.195112
II.KAPI.BHZ.00 2021-08-31T03:03:22.87 10.0 positive automatic P 280 63.996 0.150692 0.19538
GE.LUWI.BHZ. 2021-08-31T03:03:19.47 10.0 positive automatic P 285 63.5227 0.281314 0.0987427
AU.GIRL.BHZ.00 2021-08-31T03:03:03.10 10.0 positive automatic P 259 60.9088 0.524016 0.236735
GE.TNTI.BHZ. 2021-08-31T03:02:59.82 10.0 positive automatic P 290 60.7246 -0.854358 0.157987
GE.SANI.BHZ. 2021-08-31T03:02:57.37 10.0 positive automatic P 286 60.2793 0.25021 0.292945
GE.MMRI.BHZ. 2021-08-31T03:02:56.27 10.0 positive automatic P 277 60.0481 0.439463 0.247759
GE.SOEI.BHZ. 2021-08-31T03:02:41.97 10.0 positive automatic P 277 57.7531 0.968249 0.0613588
AU.MORW.BHZ. 2021-08-31T03:02:34.77 10.0 positive automatic P 253 57.1442 -1.02045 0.250621
IU.MBWA.BHZ.00 2021-08-31T03:02:32.35 10.0 positive automatic P 263 56.7553 -0.708972 0.256989
IU.CASY.BHZ.00 2021-08-31T03:02:25.32 10.0 positive automatic P 208 55.9132 -2.7379 0.344767
IU.NWAO.BHZ.00 2021-08-31T03:02:20.47 10.0 positive automatic P 249 55.0391 -0.302115 0.273269
GE.FAKI.BHZ. 2021-08-31T03:02:17.42 10.0 positive automatic P 289 54.61 0.180198 0.371546
IU.WAKE.BHZ.00 2021-08-31T03:01:52.75 10.0 positive automatic P 341 51.2755 -1.10078 0.282704
AU.KDU.BHZ.00 2021-08-31T03:01:38.15 10.0 positive automatic P 279 49.2865 -0.675765 0.262417
GT.VNDA.BHZ.00 2021-08-31T03:01:35.13 10.0 positive automatic P 186 48.8123 -1.29795 0.153436
IU.SBA.BHZ.00 2021-08-31T03:01:34.67 10.0 positive automatic P 184 48.742 -1.82769 0.199558
AU.WRKA.BHZ.00 2021-08-31T03:01:27.85 10.0 positive automatic P 262 48.0229 -1.38369 0.358971
AU.FORT.BHZ.00 2021-08-31T03:01:16.95 10.0 positive automatic P 254 46.6611 -1.63022 0.384654
MN.TNV.BHZ.01 2021-08-31T03:01:13.50 10.0 positive automatic P 187 45.7573 2.02576 0.545329
II.WRAB.BHZ.00 2021-08-31T03:01:00.90 10.0 positive automatic P 271 44.533 0.178619 0.549794
AU.HTT.BHZ. 2021-08-31T03:00:01.17 10.0 positive automatic P 253 37.1471 0.213068 0.89033
IU.CTAO.BHZ.00 2021-08-31T02:59:36.95 10.0 positive automatic P 278 34.1695 0.965904 0.990139
AU.QLP.BHZ. 2021-08-31T02:59:32.80 10.0 positive automatic P 266 33.8209 0.434537 0.809128
IU.TARA.BHZ.00 2021-08-31T02:59:17.85 10.0 positive automatic P 342 32.3389 -0.629043 0.378477
AU.TOO.BHZ.00 2021-08-31T02:59:14.23 10.0 positive automatic P 246 31.6853 0.29424 1.05931
II.TAU.BHZ.00 2021-08-31T02:59:08.02 10.0 positive automatic P 235 31.0852 -1.00976 0.84719
G.CAN.BHZ.00 2021-08-31T02:58:49.10 10.0 positive automatic P 250 28.7652 0.492755 1.12448
AU.MILA.BHZ.00 2021-08-31T02:58:48.60 10.0 positive automatic P 246 28.741 0.643589 0.97561
AU.RIV.BHZ. 2021-08-31T02:58:33.90 10.0 positive automatic P 253 26.9581 0.920635 1.28548
II.MSVF.BHZ.00 2021-08-31T02:55:53.87 10.0 positive automatic P 340 12.5944 0.212121 1.7019
NZ.OUZ.HHZ.10 2021-08-31T02:55:08.64 10.0 positive automatic P 231 9.4205 -2.53909 0.328407
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download