Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 6.0 on date 21-07-2023 and time 19:01:42 (UTC) in region Tonga Islands region [Sea: Tonga]

A magnitude Mwp 6.0 earthquake occured in region: Tonga Islands region [Sea: Tonga], on

  • 21-07-2023 19:01:42 (UTC)
  • 21-07-2023 21:01:42 (UTC +02:00) Italian time
  • 22-07-2023 08:01:42 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -22.9290, -174.5860 at 9 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.

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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
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		mb 5.2
Mwp 6.0
Mwpd 6.0 		2023-07-21
19:01:42		 -22.9289 -174.586 9 2023-07-21
19:20:33		 Sala Sismica INGV-Roma 119458991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-21 19:01:42
Latitude -22.9289
Longitude -174.5860
Depth (km) 9 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 119458991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 23202382
Semi-minor axis of confidence ellipse (meter) 16446495
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 339
Circular confidence region, given by single value of horizontal uncertainty (meter) 18911800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65.8168
Number of associated phases, regardless of their use for origin computation 52
Number of defining phases 52
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.70436
Epicentral distance of station closest to the epicenter (degree) 5.80915
Epicentral distance of station farthest from the epicenter (degree) 99.44922
Number of stations at which the event was observed 52
Number of stations from which data was used for origin computation 52
Magnitudes information

Mwpd:6.0

Field Value
Value 6.0
Uncertainty 0.1
Num. used stations 14
Type of magnitude Mwpd
Reference to an origin 119458991
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-07-21 19:20:33

Mwp:6.0

Field Value
Value 6.0
Uncertainty 0.1
Num. used stations 21
Type of magnitude Mwp
Reference to an origin 119458991
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-07-21 19:20:33

mb:5.2

Field Value
Value 5.2
Uncertainty 0.1
Num. used stations 63
Type of magnitude mb
Reference to an origin 119458991
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-07-21 19:20:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IU.ULN.BHZ.00 2023-07-21T19:15:23.22 10.0 positive automatic P 318 11038.8612 -1.15094 0.0400043
IU.CHTO.BHZ.00 2023-07-21T19:15:01.05 10.0 positive automatic P 289 10447.5753 0.220586 0.0903148
US.LAO.BHZ.00 2023-07-21T19:14:58.73 10.0 positive automatic P 40 10311.0564 4.2553 0.0959196
IU.RSSD.BHZ.00 2023-07-21T19:14:58.15 10.0 positive automatic P 43 10314.5085 2.69468 0.0479277
US.EGAK.BHZ.00 2023-07-21T19:14:47.63 10.0 positive automatic P 14 10147.9419 0.0560216 0.0354546
IU.COLA.BHZ.00 2023-07-21T19:14:41.70 10.0 positive automatic P 11 10011.3786 1.41441 0.090328
US.SDCO.BHZ.00 2023-07-21T19:14:39.40 10.0 positive automatic P 48 9852.9039 3.84307 0.0331131
GE.GSI.BHZ. 2023-07-21T19:14:35.52 10.0 positive automatic P 272 9825.0429 0.829357 0.0999035
MY.KUM.BHZ. 2023-07-21T19:14:29.92 10.0 positive automatic P 277 9685.7157 1.87329 0.107472
IU.ANMO.BHZ.00 2023-07-21T19:14:28.45 10.0 positive automatic P 50 9620.0814 1.87152 0.0731832
GE.SNAA.BHZ. 2023-07-21T19:14:21.86 10.0 positive automatic P 177 9459.8862 3.0511 0.0538829
US.ELK.BHZ.00 2023-07-21T19:14:15.73 10.0 positive automatic P 41 9343.203 2.73276 0.110475
US.WUAZ.BHZ.00 2023-07-21T19:14:14.05 10.0 positive automatic P 47 9278.8674 2.79817 0.11845
US.WVOR.BHZ.00 2023-07-21T19:14:09.93 10.0 positive automatic P 38 9239.0961 1.02887 0.0971407
MY.KOM.BHZ. 2023-07-21T19:14:07.22 10.0 positive automatic P 275 9206.5287 0.803368 0.100651
II.KDAK.BHZ.00 2023-07-21T19:14:06.02 10.0 positive automatic P 12 9188.4357 0.205481 0.0577419
IU.TUC.BHZ.00 2023-07-21T19:14:06.97 10.0 positive automatic P 50 9125.7429 2.95103 0.04178
US.TPNV.BHZ.00 2023-07-21T19:14:00.80 10.0 positive automatic P 43 9017.9952 1.97258 0.118587
AU.MAW.BHZ. 2023-07-21T19:13:55.48 10.0 positive automatic P 199 8893.8528 3.17887 0.0373893
BK.CMB.BHZ.00 2023-07-21T19:13:51.02 10.0 positive automatic P 41 8810.7804 2.57174 0.124232
IU.YSS.BHZ.00 2023-07-21T19:13:49.00 10.0 positive automatic P 332 8854.2258 -0.240264 0.161202
JP.JKA.BHZ. 2023-07-21T19:13:37.75 10.0 positive automatic P 330 8619.6384 -0.100998 0.151268
JP.JTM.BHZ. 2023-07-21T19:13:26.70 10.0 positive automatic P 327 8421.2259 -0.27584 0.0962412
JP.JMN.BHZ. 2023-07-21T19:13:21.15 10.0 positive automatic P 318 8316.342 -1.00261 0.0933952
IU.MAJO.BHZ.00 2023-07-21T19:13:16.57 10.0 positive automatic P 322 8246.634 -0.892372 0.151706
JP.JGF.BHZ. 2023-07-21T19:13:16.35 10.0 positive automatic P 321 8226.654 -0.278831 0.145669
JP.JHJ2.BHZ. 2023-07-21T19:12:58.10 10.0 positive automatic P 321 7871.8647 -0.518122 0.162714
GE.JAGI.BHZ. 2023-07-21T19:12:49.22 10.0 positive automatic P 269 7715.4102 0.41868 0.162016
AU.MORW.BHZ. 2023-07-21T19:11:59.80 10.0 positive automatic P 248 6857.2914 0.537548 0.21942
GE.TNTI.BHZ. 2023-07-21T19:11:53.32 10.0 positive automatic P 284 6790.2696 -1.97544 0.105739
IU.MBWA.BHZ.00 2023-07-21T19:11:49.72 10.0 positive automatic P 258 6701.3808 0.061458 0.23522
GE.SOEI.BHZ. 2023-07-21T19:11:46.77 10.0 positive automatic P 272 6630.0855 0.513865 0.224287
AU.FITZ.BHZ. 2023-07-21T19:11:17.38 10.0 positive automatic P 263 6196.2531 -0.50361 0.240749
AU.MTN.BHZ.00 2023-07-21T19:10:51.58 10.0 positive automatic P 271 5810.628 -1.66558 0.0764012
AU.WRKA.BHZ.00 2023-07-21T19:10:47.70 10.0 positive automatic P 255 5753.5629 -1.79973 0.311698
AU.FORT.BHZ.00 2023-07-21T19:10:43.60 10.0 positive automatic P 248 5686.2414 -1.28386 0.326722
AU.KDU.BHZ.00 2023-07-21T19:10:42.50 10.0 positive automatic P 272 5679.4371 -1.90418 0.110484
PS.JAY.BHZ. 2023-07-21T19:10:16.26 10.0 positive automatic P 289 5311.9272 -2.9437 0.327602
II.WRAB.BHZ.00 2023-07-21T19:10:13.17 10.0 positive automatic P 263 5259.5463 -1.10292 0.381897
AU.HTT.BHZ.00 2023-07-21T19:09:31.33 10.0 positive automatic P 245 4655.6508 -0.834314 0.487424
AU.COEN.BHZ.00 2023-07-21T19:09:23.38 10.0 positive automatic P 275 4541.2875 -0.253986 0.506262
AU.QLP.BHZ. 2023-07-21T19:08:53.70 10.0 positive automatic P 256 4152.9429 -0.461798 0.154997
AU.TOO.BHZ.00 2023-07-21T19:08:52.53 10.0 positive automatic P 237 4120.1757 0.599172 0.615068
IU.CTAO.BHZ.00 2023-07-21T19:08:44.22 10.0 positive automatic P 267 4044.4848 -2.1846 0.645908
G.CAN.BHZ.00 2023-07-21T19:08:26.00 10.0 positive automatic P 240 3763.3662 1.144 0.728689
AU.EIDS.BHZ. 2023-07-21T19:08:00.97 10.0 positive automatic P 258 3478.3626 -0.784711 0.833649
AU.ARMA.BHZ. 2023-07-21T19:07:59.52 10.0 positive automatic P 249 3438.5358 0.254028 0.86288
G.PPTF.BHZ.00 2023-07-21T19:07:01.75 10.0 positive automatic P 82 2668.1847 2.87039 0.888889
ND.KOUNC.BHZ.00 2023-07-21T19:06:11.85 10.0 positive automatic P 273 2192.2722 -0.0349979 1.06892
IU.RAR.BHZ.00 2023-07-21T19:04:57.12 10.0 positive automatic P 86 1534.8636 -0.927483 0.987654
II.MSVF.BHZ.00 2023-07-21T19:03:48.22 10.0 positive automatic P 306 957.7857 1.28808 0.963855
AU.NIUE.BHZ.00 2023-07-21T19:03:05.43 10.0 positive automatic P 49 644.8212 -1.89279 0.91954
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