Earthquake with magnitude of Mwp 6.1 on date 13-03-2021 and time 21:21:58 (UTC) in region New Zealand [Sea]

A magnitude Mwp 6.1 earthquake occured in region: New Zealand [Sea], on

  • 13-03-2021 21:21:58 (UTC)
  • 13-03-2021 22:21:58 (UTC +01:00) Italian time
  • 14-03-2021 10:21:58 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -28.413, -176.125 at 20 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 5.3
Mwp 6.1

Mwpd 6.1
2021-03-13
21:21:58
-28.4133 -176.125 20 2021-03-13
21:44:55
Sala Sismica INGV-Roma 88095691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-13 21:21:58
Latitude -28.4133
Longitude -176.1250
Depth (km) 20 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 88095691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 22506
Semi-minor axis of confidence ellipse (meter) 16562
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 303
Circular confidence region, given by single value of horizontal uncertainty (meter) 18166.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 139.442
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 2.52028
Epicentral distance of station closest to the epicenter (degree) 1.78593
Epicentral distance of station farthest from the epicenter (degree) 77.84957
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 34
Magnitudes information

Mwp:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 12
Type of magnitude Mwp
Reference to an origin 88095691
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-13 21:44:55

Mwpd:6.1

Field Value
Value 6.1
Uncertainty 0.2
Num. used stations 11
Type of magnitude Mwpd
Reference to an origin 88095691
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-13 21:44:55

mb:5.3

Field Value
Value 5.3
Uncertainty 0.1
Num. used stations 24
Type of magnitude mb
Reference to an origin 88095691
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-13 21:44:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.MAJO.BHZ.00 2021-03-13T21:33:50.97 10.0 positive automatic P 324 77.8496 -1.49801 0.178618
G.INU.BHZ.00 2021-03-13T21:33:49.31 10.0 positive automatic P 322 77.56 -1.49679 0.181236
MY.LDM.BHZ. 2021-03-13T21:33:14.32 10.0 positive automatic P 287 71.2119 0.445667 0
GE.JAGI.BHZ. 2021-03-13T21:32:53.62 10.0 positive automatic P 272 68.1843 -1.60153 0.288857
GE.LUWI.BHZ. 2021-03-13T21:32:28.87 10.0 positive automatic P 284 64.301 -1.41794 0.328666
GE.SANI.BHZ. 2021-03-13T21:32:06.42 10.0 positive automatic P 285 61.0325 -2.07639 0.406414
AU.MORW.BHZ. 2021-03-13T21:31:51.42 10.0 positive automatic P 252 58.5837 -0.277096 0.437093
IU.MBWA.BHZ.00 2021-03-13T21:31:47.27 10.0 positive automatic P 262 58.0276 -0.526008 0.440081
IU.CASY.BHZ.00 2021-03-13T21:31:47.77 10.0 positive automatic P 207 57.5133 3.62434 0.437314
GE.FAKI.BHZ. 2021-03-13T21:31:25.77 10.0 positive automatic P 288 55.28 -2.47927 0.430438
AU.FITZ.BHZ. 2021-03-13T21:31:18.13 10.0 positive automatic P 268 53.9871 -0.739366 0.484598
IU.SBA.BHZ.00 2021-03-13T21:31:03.62 10.0 negative automatic sP 185 50.0494 6.75303 0
GT.VNDA.BHZ.00 2021-03-13T21:31:00.75 10.0 negative automatic sP 186 50.145 3.13677 0
AU.MTN.BHZ.00 2021-03-13T21:30:57.03 10.0 positive automatic P 276 51.3213 -2.11766 0.457731
AU.KDU.BHZ.00 2021-03-13T21:30:48.95 10.0 positive automatic P 277 50.2207 -1.88334 0.556568
AU.WRKA.BHZ.00 2021-03-13T21:30:42.60 10.0 positive automatic P 260 49.3179 -1.46203 0.578407
AU.FORT.BHZ.00 2021-03-13T21:30:33.00 10.0 positive automatic P 253 48.0805 -1.47425 0.578916
II.WRAB.BHZ.00 2021-03-13T21:30:14.07 10.0 positive automatic P 269 45.6472 -1.40869 0.64236
AU.HTT.BHZ. 2021-03-13T21:29:18.37 10.0 positive automatic P 251 38.591 0.386998 0.793603
IU.CTAO.BHZ.00 2021-03-13T21:28:48.60 10.0 positive automatic P 275 35.1428 0.010985 0.843893
AU.QLP.BHZ. 2021-03-13T21:28:47.20 10.0 positive automatic P 263 35.0502 -0.567279 0.696534
G.CAN.BHZ.00 2021-03-13T21:28:08.90 10.0 positive automatic P 248 30.2496 3.04091 0.947144
IU.SNZO.BHZ.00 2021-03-13T21:28:01.77 10.0 positive automatic S 208 14.9087 -7.47785 0
AU.EIDS.BHZ. 2021-03-13T21:27:57.82 10.0 positive automatic P 268 29.3147 0.321095 0.898876
AU.ARMA.BHZ. 2021-03-13T21:27:47.40 10.0 positive automatic P 258 28.0648 0.85719 0.43956
AU.LHI.BHZ.00 2021-03-13T21:26:48.55 10.0 positive automatic P 256 21.6717 2.8928 0.987654
NZ.ODZ.HHZ.10 2021-03-13T21:26:25.10 10.0 positive automatic P 209 19.6645 1.13953 0.970874
ND.KOUNC.BHZ.00 2021-03-13T21:26:22.75 10.0 positive automatic P 289 19.4491 1.17507 0.952381
IU.RAR.BHZ.00 2021-03-13T21:25:48.05 10.0 negative automatic P 68 16.4733 1.85391 0.952381
NZ.KHZ.HHZ.10 2021-03-13T21:25:40.17 10.0 positive automatic P 208 16.3112 -3.96104 0.97561
II.MSVF.BHZ.00 2021-03-13T21:24:43.97 10.0 positive automatic P 332 11.9316 -1.39122 0.869565
NZ.OUZ.HHZ.10 2021-03-13T21:24:37.83 10.0 negative automatic P 229 11.0627 4.48414 0.938967
NZ.URZ.HHZ.10 2021-03-13T21:24:32.88 10.0 positive automatic P 208 11.3452 -4.34147 0.97561
IU.RAO.BHZ.00 2021-03-13T21:22:28.02 10.0 negative automatic P 242 1.7859 2.02965 0.941176
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