Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 6.5 on date 04-11-2019 and time 23:43:33 (Italy) in region Tonga Islands [Sea: Tonga]

A magnitude Mwp 6.5 earthquake occured in region: Tonga Islands [Sea: Tonga], on

  • 04-11-2019 22:43:33 (UTC)
  • 04-11-2019 23:43:33 (UTC +01:00) Italian time
  • 05-11-2019 11:43:33 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -18.46, -175.3 at 10 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
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
Rev 100 mb 5.4
Mwp 6.5
Mwpd 6.5 		2019-11-04
22:43:33		 -18.46 -175.3 10 2019-11-04
22:56:36		 Sala Sismica INGV-Roma 73646491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-11-04 22:43:33
Latitude -18.46
Longitude -175.30
Depth (km) 10 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 73646491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 18933
Semi-minor axis of confidence ellipse (meter) 13221
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 166
Circular confidence region, given by single value of horizontal uncertainty (meter) 15283.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81.0243
Number of associated phases, regardless of their use for origin computation 68
Number of defining phases 68
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.98753
Epicentral distance of station closest to the epicenter (degree) 5.12404
Epicentral distance of station farthest from the epicenter (degree) 82.34627
Number of stations at which the event was observed 55
Number of stations from which data was used for origin computation 55
Magnitudes information

Mwpd:6.5

Field Value
Value 6.5
Uncertainty 0.1
Num. used stations 18
Type of magnitude Mwpd
Reference to an origin 73646491
Agency INGV
Autore Auto added
Time of creation (UTC) 2019-11-04 22:56:36

Mwp:6.5

Field Value
Value 6.5
Uncertainty 0.1
Num. used stations 22
Type of magnitude Mwp
Reference to an origin 73646491
Agency INGV
Autore Auto added
Time of creation (UTC) 2019-11-04 22:56:36

mb:5.4

Field Value
Value 5.4
Uncertainty 0.1
Num. used stations 32
Type of magnitude mb
Reference to an origin 73646491
Agency INGV
Autore Auto added
Time of creation (UTC) 2019-11-04 22:56:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.BMO.BHZ.00 2019-11-04T22:55:53.20 10.0 positive automatic P 37 82.3463 -0.972676 0.15378
US.ELK.BHZ.00 2019-11-04T22:55:48.00 10.0 positive automatic P 42 81.252 -0.58066 0.159699
US.WUAZ.BHZ.00 2019-11-04T22:55:48.08 10.0 positive automatic P 48 81.0546 0.64728 0
US.NLWA.BHZ.00 2019-11-04T22:55:42.80 10.0 positive automatic P 32 80.3628 -0.762568 0.139963
IU.TUC.BHZ.00 2019-11-04T22:55:41.75 10.0 positive automatic P 51 79.8753 0.767634 0.157415
US.WVOR.BHZ.00 2019-11-04T22:55:42.90 10.0 positive automatic P 39 80.1432 0.401179 0
US.TPNV.BHZ.00 2019-11-04T22:55:33.45 10.0 positive automatic P 44 78.4854 -0.0399286 0.0925017
IU.COR.BHZ.00 2019-11-04T22:55:37.42 10.0 negative automatic P 35 78.8261 2.31215 0
IU.INCN.BHZ.00 2019-11-04T22:55:32.47 10.0 positive automatic P 317 78.142 1.14551 0
IU.SLBS.BHZ.00 2019-11-04T22:55:23.72 10.0 positive automatic P 59 76.4028 2.01646 0.215293
BK.CMB.BHZ.00 2019-11-04T22:55:21.47 10.0 positive automatic P 42 76.4407 -0.427177 0.202546
BK.SAO.BHZ.00 2019-11-04T22:55:13.62 10.0 positive automatic P 42 75.0008 0.0259456 0.219523
JP.JKA.BHZ. 2019-11-04T22:55:04.20 10.0 positive automatic PcP 328 71.2158 -6.92895 0
JP.JSD.BHZ. 2019-11-04T22:54:52.05 10.0 negative automatic P 323 71.3522 0.0509157 0
JP.JMN.BHZ. 2019-11-04T22:54:51.95 10.0 negative automatic P 317 71.181 0.916196 0.21985
JP.JOW.BHZ. 2019-11-04T22:54:51.85 10.0 negative automatic P 308 71.0235 1.82633 0
AK.ATKA.BHZ. 2019-11-04T22:54:49.25 10.0 negative automatic P 1 70.6621 1.4546 0
IU.MAJO.BHZ.00 2019-11-04T22:54:45.87 10.0 negative automatic P 322 70.3585 -0.132738 0.237021
IU.ADK.BHZ.00 2019-11-04T22:54:45.05 10.0 negative automatic P 359 70.3466 -0.837898 0
JP.JGF.BHZ. 2019-11-04T22:54:45.10 10.0 negative automatic P 321 70.2265 -0.126648 0.179679
GE.JAGI.BHZ. 2019-11-04T22:54:36.17 10.0 negative automatic P 268 68.9538 -1.12867 0.279919
II.KAPI.BHZ.00 2019-11-04T22:54:09.12 10.0 positive automatic P 273 64.6701 -0.901037 0.205432
AU.MORW.BHZ. 2019-11-04T22:53:58.20 10.0 negative automatic P 246 62.8987 -0.145042 0.362326
GE.LUWI.BHZ. 2019-11-04T22:53:59.22 10.0 positive automatic P 278 63.122 -0.555487 0.24924
IU.NWAO.BHZ.00 2019-11-04T22:53:49.35 10.0 positive automatic P 242 61.4896 0.433768 0.376885
IU.MBWA.BHZ.00 2019-11-04T22:53:43.25 10.0 positive automatic P 256 60.751 -0.621801 0.378195
IU.SBA.BHZ.00 2019-11-04T22:53:40.50 10.0 positive automatic P 184 60.0339 1.55953 0.401342
GE.SANI.BHZ. 2019-11-04T22:53:36.37 10.0 positive automatic P 279 59.7568 -0.657997 0.396011
GE.SOEI.BHZ. 2019-11-04T22:53:33.12 10.0 positive automatic P 270 59.0043 1.11321 0.397368
AU.HTT.BHZ. 2019-11-04T22:51:34.10 10.0 positive automatic P 241 43.4022 -0.721784 0.637588
IU.WAKE.BHZ.00 2019-11-04T22:51:19.90 10.0 negative automatic P 334 41.6897 -0.880431 0.330032
AU.COEN.BHZ. 2019-11-04T22:51:06.25 10.0 positive automatic P 270 40.0424 -0.993298 0.720737
AU.TOO.BHZ.00 2019-11-04T22:50:58.85 10.0 negative automatic P 233 39.1402 -0.918508 0.729243
AU.QLP.BHZ. 2019-11-04T22:50:50.57 10.0 positive automatic P 250 38.0877 -0.290018 0.724272
IU.PMG.BHZ.00 2019-11-04T22:50:45.77 10.0 positive automatic P 279 37.4601 0.236451 0.797078
G.CAN.BHZ.00 2019-11-04T22:50:30.75 10.0 negative automatic P 235 35.7523 -0.327068 0.793659
AU.ARMA.BHZ. 2019-11-04T22:50:01.85 10.0 positive automatic P 242 32.2441 1.15921 0.915239
AU.EIDS.BHZ. 2019-11-04T22:49:56.95 10.0 positive automatic P 251 31.8546 -0.158831 0.861354
NZ.ODZ.HHZ.10 2019-11-04T22:49:31.53 10.0 positive automatic P 201 29.0494 -0.803539 0.947867
IU.XMAS.BHZ.00 2019-11-04T22:49:14.50 10.0 positive automatic P 42 26.9986 0.52879 0
NZ.KHZ.HHZ.10 2019-11-04T22:48:59.44 10.0 negative automatic P 199 25.763 -3.37293 0.328407
G.PPTF.BHZ.00 2019-11-04T22:48:54.20 10.0 negative automatic P 92 24.4657 3.06766 0.909091
IU.SNZO.BHZ.00 2019-11-04T22:48:50.12 10.0 negative automatic P 198 24.397 -0.286911 0.963855
IU.TARA.BHZ.00 2019-11-04T22:48:35.67 10.0 negative automatic P 328 22.9488 -0.663723 0.842105
NZ.URZ.HHZ.10 2019-11-04T22:48:09.33 10.0 positive automatic P 197 20.8785 -4.87364 0.990099
ND.KOUNC.BHZ.00 2019-11-04T22:47:59.10 10.0 positive automatic P 260 19.3425 1.61877 0.909091
NZ.OUZ.HHZ.10 2019-11-04T22:47:57.21 10.0 negative automatic P 208 19.439 -1.32566 0.888889
AU.NFK.BHZ.00 2019-11-04T22:47:52.24 10.0 positive automatic P 232 18.6031 2.8541 0.925926
ND.ONTNC.BHZ.00 2019-11-04T22:47:37.49 10.0 positive automatic P 254 17.518 1.21159 0.909091
G.SANVU.BHZ.00 2019-11-04T22:47:31.55 10.0 positive automatic P 278 16.9966 1.78312 0.869565
ND.MARNC.BHZ.00 2019-11-04T22:47:15.15 10.0 positive automatic P 256 15.9471 -1.24642 0.47619
IU.RAR.BHZ.00 2019-11-04T22:47:05.25 10.0 negative automatic P 103 14.8553 3.22393 0.963855
II.MSVF.BHZ.00 2019-11-04T22:45:06.17 10.0 positive automatic P 275 6.3578 0.335384 0.754717
IU.AFI.BHZ.00 2019-11-04T22:44:52.75 10.0 positive automatic P 37 5.667 -3.58305 0.97561
AU.NIUE.BHZ. 2019-11-04T22:44:48.22 10.0 negative automatic P 98 5.124 -0.54594 0.930233
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