Earthquake with magnitude of Mwpd 7.8 on date 04-03-2021 and time 20:28:32 (Italy) in region New Zealand [Sea]

A magnitude Mwpd 7.8 earthquake occured in region: New Zealand [Sea], on

  • 04-03-2021 19:28:32 (UTC)
  • 04-03-2021 20:28:32 (UTC +01:00) Italian time
  • 05-03-2021 08:28:32 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -29.348, -176.916 at 2 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 6.0
Mwp 7.7
Mwpd 7.8
2021-03-04
19:28:32
-29.3484 -176.916 2 2021-03-04
19:44:36
Sala Sismica INGV-Roma 87733301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-04 19:28:32
Latitude -29.3484
Longitude -176.9160
Depth (km) 2 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 87733301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 24998
Semi-minor axis of confidence ellipse (meter) 12034
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 310
Circular confidence region, given by single value of horizontal uncertainty (meter) 20177.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65.4795
Number of associated phases, regardless of their use for origin computation 82
Number of defining phases 82
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 2.7402
Epicentral distance of station closest to the epicenter (degree) 12.08087
Epicentral distance of station farthest from the epicenter (degree) 81.22742
Number of stations at which the event was observed 60
Number of stations from which data was used for origin computation 60
Magnitudes information

Mwp:7.7

Field Value
Value 7.7
Uncertainty 0.2
Num. used stations 43
Type of magnitude Mwp
Reference to an origin 87733301
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-04 19:44:36

Mwpd:7.8

Field Value
Value 7.8
Uncertainty 0.2
Num. used stations 41
Type of magnitude Mwpd
Reference to an origin 87733301
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-04 19:44:36

mb:6

Field Value
Value 6
Uncertainty 0.1
Num. used stations 45
Type of magnitude mb
Reference to an origin 87733301
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-04 19:44:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GE.SNAA.BHZ. 2021-03-04T19:40:36.86 10.0 positive automatic P 178 78.892 1.04395 0.169438
GE.MNAI.BHZ. 2021-03-04T19:40:35.37 10.0 positive automatic P 271 79.2614 -2.35209 0.152915
IU.ADK.BHZ.00 2021-03-04T19:40:47.47 10.0 positive automatic P 0 81.2274 -0.843581 0.165784
GE.PMBI.BHZ. 2021-03-04T19:40:39.87 10.0 negative automatic P 273 78.4544 6.61059 0.169611
IU.MAJO.BHZ.00 2021-03-04T19:40:30.17 10.0 positive automatic P 325 78.2049 -1.77627 0.192237
IU.TATO.BHZ.00 2021-03-04T19:40:40.62 10.0 positive automatic P 306 80.2641 -2.54102 0.116939
G.INU.BHZ.00 2021-03-04T19:40:28.31 10.0 positive automatic P 323 77.8856 -1.81816 0.178383
G.COYC.BHZ.00 2021-03-04T19:40:38.30 10.0 positive automatic P 136 78.822 2.97194 0.186248
C1.MG02.BHZ. 2021-03-04T19:40:27.58 10.0 negative automatic P 144 76.6953 4.12992 0.200136
MY.SBM.BHZ. 2021-03-04T19:40:22.87 10.0 positive automatic PcP 282 74.6647 -3.23273 0
JP.JMZ.BHZ. 2021-03-04T19:40:18.60 10.0 negative automatic PcP 313 74.2666 -5.75826 0
IU.PMSA.BHZ.00 2021-03-04T19:40:17.62 10.0 negative automatic PcP 156 72.5978 0.400445 0
MY.KKM.BHZ. 2021-03-04T19:40:01.52 10.0 positive automatic P 287 73.2048 -1.87253 0.23857
GE.SMRI.BHZ. 2021-03-04T19:39:54.72 10.0 negative automatic P 272 71.4421 1.96741 0.252067
GE.BKB.BHZ. 2021-03-04T19:39:36.37 10.0 positive automatic P 281 68.808 -0.211812 0.281713
GE.JAGI.BHZ. 2021-03-04T19:39:26.22 10.0 positive automatic P 273 67.5324 -2.36296 0.310789
II.KAPI.BHZ.00 2021-03-04T19:39:06.52 10.0 positive automatic P 279 64.3677 -1.71484 0.320836
GE.LUWI.BHZ. 2021-03-04T19:39:03.27 10.0 positive automatic P 285 63.8586 -1.56422 0.349826
AU.GIRL.BHZ.00 2021-03-04T19:38:48.68 10.0 negative automatic P 259 61.3805 0.369413 0.382886
GE.TNTI.BHZ. 2021-03-04T19:38:43.72 10.0 positive automatic P 289 61.0284 -2.18927 0.347318
GE.SANI.BHZ. 2021-03-04T19:38:40.47 10.0 positive automatic P 286 60.6083 -2.57956 0.384549
GE.MMRI.BHZ. 2021-03-04T19:38:39.92 10.0 positive automatic P 277 60.4327 -1.94432 0.405351
GE.SOEI.BHZ. 2021-03-04T19:38:25.72 10.0 positive automatic P 277 58.1377 -0.419595 0.40936
IU.GUMO.BHZ.00 2021-03-04T19:38:13.05 10.0 positive automatic P 314 56.595 -2.04963 0.372901
IU.CASY.BHZ.00 2021-03-04T19:38:11.97 10.0 positive automatic P 207 56.3646 -1.45796 0.465187
IU.NWAO.BHZ.00 2021-03-04T19:38:04.32 10.0 positive automatic P 248 55.5394 -3.25967 0.477828
G.KIP.BHZ.00 2021-03-04T19:37:58.15 10.0 negative automatic P 22 53.9338 2.25776 0.49121
GE.SAUI.BHZ. 2021-03-04T19:37:50.07 10.0 positive automatic P 283 52.9806 1.19094 0.518098
AU.FITZ.BHZ. 2021-03-04T19:37:49.13 10.0 positive automatic P 269 53.2628 -1.84053 0.495867
AU.MTN.BHZ.00 2021-03-04T19:37:31.88 10.0 negative automatic P 277 50.7457 -0.33369 0.495604
IU.SBA.BHZ.00 2021-03-04T19:37:23.12 10.0 negative automatic P 184 49.0621 3.72784 0.550176
AU.KDU.BHZ.00 2021-03-04T19:37:22.00 10.0 positive automatic P 278 49.6618 -1.97835 0.506436
GT.VNDA.BHZ.00 2021-03-04T19:37:21.75 10.0 negative automatic P 186 49.1426 1.72663 0.581555
GE.GENI.BHZ. 2021-03-04T19:37:15.22 10.0 positive automatic P 295 48.7077 -1.45197 0.515355
AU.WRKA.BHZ.00 2021-03-04T19:37:11.93 10.0 positive automatic P 261 48.4846 -3.12746 0.607262
AU.FORT.BHZ.00 2021-03-04T19:37:01.60 10.0 positive automatic P 254 47.1481 -3.00837 0.594738
AU.MANU.BHZ.00 2021-03-04T19:36:36.80 10.0 positive automatic P 302 43.5524 0.724084 0.649607
AU.HTT.BHZ. 2021-03-04T19:35:45.90 10.0 positive automatic P 252 37.6383 -1.3883 0.505097
IU.XMAS.BHZ.00 2021-03-04T19:35:40.90 10.0 negative automatic P 34 36.504 3.37564 0.797441
IU.CTAO.BHZ.00 2021-03-04T19:35:21.45 10.0 negative automatic P 277 34.553 0.637134 0.866542
AU.QLP.BHZ. 2021-03-04T19:35:17.32 10.0 positive automatic P 265 34.2668 -0.981944 0.883171
II.TAU.BHZ.00 2021-03-04T19:34:55.17 10.0 negative automatic P 235 31.5978 0.214456 0.940709
AU.MCQ.BHZ.00 2021-03-04T19:34:47.20 10.0 positive automatic P 208 30.5727 1.30767 0.858587
IU.HNR.BHZ.00 2021-03-04T19:34:36.77 10.0 positive automatic P 308 29.4152 1.10586 0.91954
G.CAN.BHZ.00 2021-03-04T19:34:35.30 10.0 positive automatic P 249 29.2632 0.885362 0.851064
AU.MILA.BHZ.00 2021-03-04T19:34:34.50 10.0 positive automatic P 246 29.2457 0.226159 0.963855
AU.EIDS.BHZ. 2021-03-04T19:34:29.02 10.0 positive automatic P 270 28.6093 0.496909 0.97561
G.PPTF.BHZ.00 2021-03-04T19:34:22.15 10.0 negative automatic P 71 27.608 2.47725 0.909091
AU.RIV.BHZ. 2021-03-04T19:34:19.17 10.0 positive automatic P 252 27.4488 1.04408 0.869565
AU.ARMA.BHZ. 2021-03-04T19:34:17.20 10.0 positive automatic P 260 27.2048 1.0686 0.930233
IU.FUNA.BHZ.00 2021-03-04T19:33:18.27 10.0 positive automatic P 349 21.139 1.24293 0.930233
AU.LHI.BHZ.00 2021-03-04T19:33:15.58 10.0 negative automatic P 258 20.7837 2.37734 0.930233
G.SANVU.BHZ.00 2021-03-04T19:33:08.60 10.0 negative automatic P 310 20.174 2.02099 0.930233
NZ.ODZ.HHZ.10 2021-03-04T19:32:43.27 10.0 positive automatic P 209 18.5117 -5.13932 0.930233
IU.RAR.BHZ.00 2021-03-04T19:32:34.12 10.0 negative automatic P 66 17.4767 -1.56884 0.930233
IU.AFI.BHZ.00 2021-03-04T19:32:13.85 10.0 positive automatic P 18 16.1541 -5.23394 0.952381
NZ.KHZ.HHZ.10 2021-03-04T19:32:00.27 10.0 negative automatic P 208 15.1603 -5.7387 0.938967
IU.SNZO.BHZ.00 2021-03-04T19:31:50.02 10.0 negative automatic P 207 13.7593 3.08426 0.952381
II.MSVF.BHZ.00 2021-03-04T19:31:33.17 10.0 positive automatic P 337 12.4815 3.56608 0.444444
AU.NIUE.BHZ. 2021-03-04T19:31:23.52 10.0 positive automatic P 33 12.0809 -0.484808 0.97561
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