Earthquake with magnitude of Mwp 6.6 on date 18-08-2021 and time 12:10:07 (Italy) in region Vanuatu Islands [Sea: Vanuatu]

A magnitude Mwp 6.6 earthquake occured in region: Vanuatu Islands [Sea: Vanuatu], on

  • 18-08-2021 10:10:07 (UTC)
  • 18-08-2021 12:10:07 (UTC +02:00) Italian time
  • 18-08-2021 21:10:07 (UTC +11:00) local time in the region of the earthquake (Pacific/Efate)

and geographic coordinates (lat, lon) -14.836, 167.065 at 111 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 5.7
Mwp 6.6

Mwpd 6.6
2021-08-18
10:10:07
-14.8359 167.065 111 2021-08-18
10:32:32
Sala Sismica INGV-Roma 94325621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 10:10:07
Latitude -14.8359
Longitude 167.0650
Depth (km) 111 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 94325621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 10269
Semi-minor axis of confidence ellipse (meter) 2084
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 8296.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54.2075
Number of associated phases, regardless of their use for origin computation 87
Number of defining phases 87
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.2899
Epicentral distance of station closest to the epicenter (degree) 8.80369
Epicentral distance of station farthest from the epicenter (degree) 87.39585
Number of stations at which the event was observed 75
Number of stations from which data was used for origin computation 75
Magnitudes information

Mwpd:6.6

Field Value
Value 6.6
Uncertainty 0.3
Num. used stations 51
Type of magnitude Mwpd
Reference to an origin 94325621
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-18 10:28:55

Mwp:6.6

Field Value
Value 6.6
Uncertainty 0.3
Num. used stations 54
Type of magnitude Mwp
Reference to an origin 94325621
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-18 10:28:55

mb:5.7

Field Value
Value 5.7
Uncertainty 0.1
Num. used stations 60
Type of magnitude mb
Reference to an origin 94325621
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-18 10:28:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.NLWA.BHZ.00 2021-08-18T10:22:40.65 10.0 negative automatic P 39 87.3958 -0.340043 0.110229
US.WRAK.BHZ.00 2021-08-18T10:22:39.30 10.0 negative automatic P 29 87.1731 -0.524233 0.0528596
IU.SBA.BHZ.00 2021-08-18T10:20:21.85 10.0 positive automatic P 180 63.0107 0.590207 0.176384
IU.COLA.BHZ.00 2021-08-18T10:22:39.95 10.0 positive automatic P 18 86.6685 2.54955 0.108077
IU.COR.BHZ.00 2021-08-18T10:22:37.57 10.0 negative automatic P 42 86.5622 0.703609 0.116415
BK.CMB.BHZ.00 2021-08-18T10:22:33.40 10.0 positive automatic P 49 85.9489 -0.563721 0.116993
NZ.KHZ.HHZ.10 2021-08-18T10:22:31.37 10.0 positive automatic ScP 170 28.1368 2.60191 0
IU.SNZO.BHZ.00 2021-08-18T10:22:29.12 10.0 positive automatic ScP 167 27.2882 2.93667 0
G.CAN.BHZ.00 2021-08-18T10:22:27.85 10.0 negative automatic ScP 215 26.1182 4.9883 0
IU.BILL.BHZ.00 2021-08-18T10:22:17.47 10.0 negative automatic P 360 82.8987 -1.04539 0.145603
IU.ULN.BHZ.00 2021-08-18T10:22:15.07 10.0 positive automatic P 324 82.2807 -0.463295 0.144144
IU.YAK.BHZ.00 2021-08-18T10:22:13.12 10.0 negative automatic P 343 82.2909 -2.20733 0.147335
AK.GAMB.BHZ. 2021-08-18T10:22:03.91 10.0 negative automatic P 9 80.2979 -0.878363 0
II.KDAK.BHZ.00 2021-08-18T10:22:00.85 10.0 negative automatic P 21 79.8526 -1.57191 0.172356
IU.MA2.BHZ.00 2021-08-18T10:21:37.32 10.0 negative automatic P 352 75.5748 -1.39409 0.199795
IU.CHTO.BHZ.00 2021-08-18T10:21:37.50 10.0 positive automatic P 295 75.0216 1.93115 0.224633
AT.AKUT.BHZ. 2021-08-18T10:21:19.84 10.0 negative automatic P 16 72.7566 -2.45682 0.0860786
RM.SLV.BHZ. 2021-08-18T10:21:18.07 10.0 positive automatic P 299 71.7285 1.78318 0.248944
GE.GSI.BHZ. 2021-08-18T10:21:10.92 10.0 negative automatic P 277 70.5595 1.7735 0.126594
IU.PET.BHZ.00 2021-08-18T10:20:53.67 10.0 negative automatic P 355 68.243 -1.22285 0.281882
IU.ADK.BHZ.00 2021-08-18T10:20:52.67 10.0 negative automatic P 11 68.1942 -1.92014 0.29218
AT.SMY.BHZ. 2021-08-18T10:20:51.04 10.0 positive automatic P 5 67.8369 -1.30481 0.282778
IU.YSS.BHZ.00 2021-08-18T10:20:37.85 10.0 negative automatic P 342 65.5309 0.133398 0.320898
IU.INCN.BHZ.00 2021-08-18T10:20:33.07 10.0 negative automatic P 325 64.6533 1.04017 0.22462
IU.CASY.BHZ.00 2021-08-18T10:20:23.37 10.0 positive automatic P 202 63.3253 0.0456617 0.348707
JP.JTU.BHZ. 2021-08-18T10:20:10.55 10.0 negative automatic P 325 60.9682 2.94544 0.397783
II.ERM.BHZ.00 2021-08-18T10:20:07.82 10.0 negative automatic P 340 60.9721 0.19401 0.256994
JP.JTM.BHZ. 2021-08-18T10:20:04.85 10.0 positive automatic P 338 60.6221 -0.419678 0.402667
JP.YOJ.BHZ. 2021-08-18T10:19:48.75 10.0 positive automatic P 312 58.2424 -0.150614 0.37462
JP.JSU.BHZ. 2021-08-18T10:19:47.80 10.0 positive automatic P 323 58.1474 -0.50291 0.35414
IU.MAJO.BHZ.00 2021-08-18T10:19:46.72 10.0 positive automatic P 333 58.1493 -1.59719 0.391789
JP.JMN.BHZ. 2021-08-18T10:19:46.55 10.0 positive automatic P 328 57.9519 -0.416297 0.394399
JP.JGF.BHZ. 2021-08-18T10:19:44.60 10.0 negative automatic P 332 57.7512 -0.969056 0.405695
G.INU.BHZ.00 2021-08-18T10:19:44.51 10.0 negative automatic P 331 57.6932 -0.578238 0.406483
MY.SBM.BHZ. 2021-08-18T10:19:41.62 10.0 negative automatic P 283 56.9702 1.5921 0.435292
JP.JSG.BHZ. 2021-08-18T10:19:38.95 10.0 negative automatic P 332 56.604 1.53459 0.461553
GE.SMRI.BHZ. 2021-08-18T10:19:34.92 10.0 negative automatic P 271 55.9981 1.79011 0.420698
JP.JCJ.BHZ. 2021-08-18T10:18:35.10 10.0 positive automatic P 330 48.387 -1.73623 0.53124
II.KAPI.BHZ.00 2021-08-18T10:18:31.37 10.0 negative automatic P 277 47.5241 1.15749 0.609416
GE.LUWI.BHZ. 2021-08-18T10:18:17.67 10.0 positive automatic P 283 45.8552 0.509849 0.654406
IU.MBWA.BHZ.00 2021-08-18T10:18:13.22 10.0 negative automatic P 255 45.2988 0.413857 0.633697
GE.MMRI.BHZ. 2021-08-18T10:18:04.67 10.0 negative automatic P 273 44.2515 0.175962 0.572346
GE.SANI.BHZ. 2021-08-18T10:17:51.37 10.0 negative automatic P 284 42.489 1.0479 0.668422
GE.TNTI.BHZ. 2021-08-18T10:17:50.02 10.0 positive automatic P 288 42.2456 1.66312 0.704802
GE.SOEI.BHZ. 2021-08-18T10:17:48.42 10.0 negative automatic P 272 42.0602 1.39678 0.63293
G.PPTF.BHZ.00 2021-08-18T10:17:45.05 10.0 positive automatic P 100 41.6471 1.44827 0.330488
AU.FITZ.BHZ. 2021-08-18T10:17:27.90 10.0 negative automatic P 259 39.7794 -0.263283 0.751744
IU.XMAS.BHZ.00 2021-08-18T10:17:22.37 10.0 negative automatic P 67 38.9709 0.935359 0.73258
IU.JOHN.BHZ.00 2021-08-18T10:17:22.62 10.0 negative automatic P 37 39.117 -0.0268046 0.721656
GE.BNDI.BHZ. 2021-08-18T10:17:14.17 10.0 negative automatic P 282 37.9839 0.995622 0.363172
AU.WRKA.BHZ.00 2021-08-18T10:17:10.30 10.0 positive automatic P 248 37.6984 -0.579612 0.765205
GE.FAKI.BHZ. 2021-08-18T10:16:59.92 10.0 positive automatic P 286 36.3277 0.724242 0.839988
IU.GUMO.BHZ.00 2021-08-18T10:16:54.00 10.0 positive automatic P 321 35.9215 -0.752849 0.828214
AU.MTN.BHZ.00 2021-08-18T10:16:47.13 10.0 negative automatic P 269 34.9089 0.0515351 0.801208
IU.WAKE.BHZ.00 2021-08-18T10:16:39.65 10.0 negative automatic P 359 34.1203 -0.61279 0.865184
AU.KDU.BHZ.00 2021-08-18T10:16:36.00 10.0 positive automatic P 269 33.6347 -0.06247 0.885833
II.TAU.BHZ.00 2021-08-18T10:16:28.42 10.0 positive automatic P 207 32.783 -0.252388 0.815488
IU.RAR.BHZ.00 2021-08-18T10:16:22.85 10.0 positive automatic P 106 32.107 0.0931462 0.876171
AU.HTT.BHZ. 2021-08-18T10:16:17.97 10.0 negative automatic P 229 31.5232 0.21647 0.930994
II.WRAB.BHZ.00 2021-08-18T10:16:16.97 10.0 positive automatic P 256 31.5719 -1.15299 0.94128
AU.TOO.BHZ.00 2021-08-18T10:16:02.05 10.0 positive automatic P 216 29.7001 0.376936 0.97561
NZ.KHZ.HHZ.10 2021-08-18T10:15:45.29 10.0 positive automatic P 170 28.1368 -2.44025 0.909091
AU.MILA.BHZ.00 2021-08-18T10:15:40.60 10.0 positive automatic P 212 27.3308 -0.0768744 0.930233
IU.SNZO.BHZ.00 2021-08-18T10:15:38.15 10.0 positive automatic P 167 27.2882 -2.03773 0.930233
G.CAN.BHZ.00 2021-08-18T10:15:30.00 10.0 positive automatic P 215 26.1182 0.208288 0.952381
NZ.URZ.HHZ.10 2021-08-18T10:15:18.66 10.0 positive automatic P 161 25.048 -1.35164 0.819672
II.KWJN.BHZ.00 2021-08-18T10:15:11.02 10.0 positive automatic P 1 24.1267 -0.610927 0.909091
AU.ARMA.BHZ. 2021-08-18T10:14:42.27 10.0 positive automatic P 220 21.0638 0.74132 0.987654
NZ.OUZ.HHZ.10 2021-08-18T10:14:42.79 10.0 positive automatic P 165 21.2115 -0.132345 0.947867
IU.CTAO.BHZ.00 2021-08-18T10:14:36.45 10.0 negative automatic P 252 20.5157 0.917979 0.898876
IU.AFI.BHZ.00 2021-08-18T10:14:36.57 10.0 positive automatic P 90 20.5076 1.06971 0.761905
AU.EIDS.BHZ. 2021-08-18T10:14:12.67 10.0 negative automatic P 232 18.3072 1.1263 0.869565
AU.LHI.BHZ.00 2021-08-18T10:14:10.75 10.0 positive automatic P 202 18.2171 0.215312 0.91954
AU.RABL.BHZ.00 2021-08-18T10:14:06.90 10.0 positive automatic P 304 18.1265 -2.6761 0.769231
IU.TARA.BHZ.00 2021-08-18T10:13:58.80 10.0 negative automatic P 20 17.1964 -0.523941 0.740741
AU.NFK.BHZ.00 2021-08-18T10:13:20.68 10.0 positive automatic P 177 14.2297 -1.87544 0.917431
II.MSVF.BHZ.00 2021-08-18T10:12:42.77 10.0 positive automatic P 107 10.937 3.30391 0.869565
IU.HNR.BHZ.00 2021-08-18T10:12:10.05 10.0 positive automatic P 307 8.8037 -0.4766 0.909091
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