Earthquake with magnitude of Mwp 6.2 on date 28-02-2021 and time 23:37:13 (UTC) in region Vanuatu Islands [Sea: Vanuatu]

A magnitude Mwp 6.2 earthquake occured in region: Vanuatu Islands [Sea: Vanuatu], on

  • 28-02-2021 23:37:13 (UTC)
  • 01-03-2021 00:37:13 (UTC +01:00) Italian time
  • 01-03-2021 10:37:13 (UTC +11:00) local time in the region of the earthquake (Pacific/Efate)

and geographic coordinates (lat, lon) -17.25, 168.2 at 18 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 5.2
Mwp 6.2

Mwpd 6.3
2021-02-28
23:37:13
-17.25 168.2 18 2021-02-28
23:52:42
Sala Sismica INGV-Roma 87585901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-28 23:37:13
Latitude -17.25
Longitude 168.20
Depth (km) 18 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 87585901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 12294
Semi-minor axis of confidence ellipse (meter) 6231
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 11024.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 189.538
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) 2.204
Epicentral distance of station closest to the epicenter (degree) 2.03899
Epicentral distance of station farthest from the epicenter (degree) 90.26482
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 35
Magnitudes information

Mwpd:6.3

Field Value
Value 6.3
Uncertainty 0.2
Num. used stations 10
Type of magnitude Mwpd
Reference to an origin 87585901
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-02-28 23:52:42

Mwp:6.2

Field Value
Value 6.2
Uncertainty 0.1
Num. used stations 13
Type of magnitude Mwp
Reference to an origin 87585901
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-02-28 23:52:42

mb:5.2

Field Value
Value 5.2
Uncertainty 0.1
Num. used stations 23
Type of magnitude mb
Reference to an origin 87585901
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-02-28 23:52:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.WVOR.BHZ.00 2021-02-28T23:50:18.38 10.0 positive automatic sP 45 89.7607 2.51587 0
GE.MALK.BHZ. 2021-02-28T23:50:16.02 10.0 negative automatic pP 279 90.2648 -0.930929 0
BK.CMB.BHZ.00 2021-02-28T23:49:59.57 10.0 positive automatic pP 48 86.7238 -0.664084 0
CI.PHL.BHZ. 2021-02-28T23:49:58.02 10.0 positive automatic sP 51 85.5014 2.94577 0
IU.BILL.BHZ.00 2021-02-28T23:49:50.37 10.0 positive automatic PcP 359 85.3187 0.0679359 0
IU.ULN.BHZ.00 2021-02-28T23:49:48.37 10.0 positive automatic PcP 324 84.8728 -0.189946 0
IU.CHTO.BHZ.00 2021-02-28T23:49:05.47 10.0 negative automatic pP 295 77.0193 -3.58744 0
GE.GSI.BHZ. 2021-02-28T23:48:37.22 10.0 positive automatic pP 277 71.9376 -2.20998 0
MY.IPM.BHZ. 2021-02-28T23:48:22.82 10.0 negative automatic P 282 69.7429 2.59071 0.212841
JP.JKA.BHZ. 2021-02-28T23:48:01.60 10.0 positive automatic PcP 339 63.0085 -13.3111 0
GE.JAGI.BHZ. 2021-02-28T23:46:30.37 10.0 positive automatic P 272 53.2526 1.57462 0.501637
AU.MORW.BHZ. 2021-02-28T23:45:58.62 10.0 positive automatic P 246 48.9925 1.80534 0.557398
II.KAPI.BHZ.00 2021-02-28T23:45:56.40 10.0 negative automatic P 279 48.9301 0.0545408 0.55214
IU.NWAO.BHZ.00 2021-02-28T23:45:51.55 10.0 negative automatic P 241 48.2341 0.546596 0.596941
IU.MBWA.BHZ.00 2021-02-28T23:45:30.50 10.0 negative automatic P 257 45.7679 -1.21247 0.611102
GE.SANI.BHZ. 2021-02-28T23:45:18.67 10.0 negative automatic P 285 44.1494 -0.125656 0.598203
GE.SOEI.BHZ. 2021-02-28T23:45:14.27 10.0 positive automatic P 274 43.2743 2.34153 0.685483
AU.FORT.BHZ.00 2021-02-28T23:44:34.88 10.0 positive automatic P 242 38.8317 -0.332692 0.78877
GE.FAKI.BHZ. 2021-02-28T23:44:30.37 10.0 positive automatic P 288 38.0731 1.54338 0
AU.WRKA.BHZ.00 2021-02-28T23:44:24.65 10.0 positive automatic P 251 37.8821 -2.64793 0.798192
AU.KDU.BHZ.00 2021-02-28T23:44:02.05 10.0 positive automatic P 273 34.7649 1.484 0.822285
II.WRAB.BHZ.00 2021-02-28T23:43:34.30 10.0 negative automatic P 260 32.1331 -3.39699 0.917618
AU.HTT.BHZ. 2021-02-28T23:43:25.27 10.0 negative automatic P 233 30.8438 -1.13526 0.957073
AU.MILA.BHZ.00 2021-02-28T23:42:43.48 10.0 negative automatic P 217 25.9567 0.660248 0.888889
NZ.KHZ.HHZ.10 2021-02-28T23:42:41.59 10.0 positive automatic P 171 25.5761 2.3495 0.930233
G.CAN.BHZ.00 2021-02-28T23:42:31.65 10.0 positive automatic P 220 24.863 -1.21717 0.930233
AU.QLP.BHZ. 2021-02-28T23:42:22.32 10.0 positive automatic P 243 24.0582 -3.12935 0.930233
NZ.URZ.HHZ.10 2021-02-28T23:42:10.62 10.0 positive automatic P 161 22.4138 1.75781 0.888889
IU.CTAO.BHZ.00 2021-02-28T23:41:52.22 10.0 negative automatic P 259 20.9679 -1.19065 0.941176
AU.RABL.BHZ.00 2021-02-28T23:41:49.43 10.0 positive automatic P 308 20.4322 1.8308 0.97561
AU.ARMA.BHZ. 2021-02-28T23:41:42.85 10.0 negative automatic P 226 20.0332 -0.554861 0.952381
NZ.OUZ.HHZ.10 2021-02-28T23:41:29.28 10.0 positive automatic P 166 18.6041 1.70419 0.956938
AU.EIDS.BHZ. 2021-02-28T23:41:14.70 10.0 negative automatic P 240 17.8722 -4.26788 0.91954
IU.HNR.BHZ.00 2021-02-28T23:39:52.02 10.0 negative automatic P 313 11.1952 1.60718 0.963855
G.SANVU.BHZ.00 2021-02-28T23:37:47.00 10.0 positive automatic P 332 2.039 2.29132 0.952381
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download