Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 6.0 on date 06-12-2019 and time 13:04:50 (UTC) in region Tonga Islands [Sea: Tonga]

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

  • 06-12-2019 13:04:50 (UTC)
  • 06-12-2019 14:04:50 (UTC +01:00) Italian time
  • 07-12-2019 01:04:50 (UTC +12:00) local time in the region of the earthquake (Pacific/Wallis)

and geographic coordinates (lat, lon) -15.28, -175.25 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
Reviewed
Rev100 		mb 5.2
Mwp 6.0
Mwpd 6.1 		2019-12-06
13:04:50		 -15.28 -175.25 10 2019-12-06
13:19:46		 Sala Sismica INGV-Roma 74379241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-06 13:04:50
Latitude -15.28
Longitude -175.25
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 74379241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 26271
Semi-minor axis of confidence ellipse (meter) 14852
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) 21207
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59.2779
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 3.01654
Epicentral distance of station closest to the epicenter (degree) 3.62568
Epicentral distance of station farthest from the epicenter (degree) 89.39916
Number of stations at which the event was observed 50
Number of stations from which data was used for origin computation 50
Magnitudes information

Mwpd:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 10
Type of magnitude Mwpd
Reference to an origin 74379241
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2019-12-06 13:19:46

Mwp:6

Field Value
Value 6
Uncertainty 0.2
Num. used stations 16
Type of magnitude Mwp
Reference to an origin 74379241
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2019-12-06 13:19:46

mb:5.2

Field Value
Value 5.2
Uncertainty 0.1
Num. used stations 27
Type of magnitude mb
Reference to an origin 74379241
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2019-12-06 13:19:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.DGMT.BHZ.00 2019-12-06T13:17:48.93 10.0 positive automatic P 39 89.3992 3.56657 0.0971138
IU.HKT.BHZ.00 2019-12-06T13:17:46.62 10.0 negative automatic PcP 58 88.7349 2.99724 0
GE.GSI.BHZ. 2019-12-06T13:17:38.22 10.0 positive automatic P 272 87.6185 1.36989 0.111116
US.EGMT.BHZ.00 2019-12-06T13:17:32.08 10.0 positive automatic PcP 38 85.8829 0.788702 0
US.AMTX.BHZ.00 2019-12-06T13:17:32.90 10.0 positive automatic PcP 52 85.8003 1.98485 0
US.JCT.BHZ.00 2019-12-06T13:17:30.53 10.0 negative automatic PcP 57 85.6794 0.214088 0
US.RLMT.BHZ.00 2019-12-06T13:17:26.53 10.0 negative automatic P 40 84.813 3.15764 0.126913
US.BOZ.BHZ.00 2019-12-06T13:17:19.93 10.0 negative automatic P 39 83.5847 2.89527 0.136629
US.SDCO.BHZ.00 2019-12-06T13:17:21.53 10.0 positive automatic P 48 84.0983 1.69712 0.135605
US.BW06.BHZ.00 2019-12-06T13:17:18.90 10.0 positive automatic P 42 83.5297 2.04154 0.131113
AT.SKAG.BHZ. 2019-12-06T13:17:13.42 10.0 positive automatic P 19 81.428 7.88447 0.157418
IU.ANMO.BHZ.00 2019-12-06T13:17:11.95 10.0 negative automatic P 50 82.2299 1.89845 0.139818
IU.COLA.BHZ.00 2019-12-06T13:17:11.02 10.0 positive automatic P 11 82.8085 -1.76262 0.136739
US.NEW.BHZ.00 2019-12-06T13:17:10.08 10.0 positive automatic P 35 81.8053 2.44191 0.15308
US.HWUT.BHZ.00 2019-12-06T13:17:09.58 10.0 negative automatic P 43 81.67 2.47411 0.154242
US.HLID.BHZ.00 2019-12-06T13:17:03.00 10.0 positive automatic P 40 80.8436 0.294254 0.161438
US.HAWA.BHZ.00 2019-12-06T13:16:58.00 10.0 positive automatic P 35 79.3941 3.3649 0.174456
US.BMO.BHZ.00 2019-12-06T13:16:57.45 10.0 negative automatic P 38 79.7932 0.50416 0.16888
US.WUAZ.BHZ.00 2019-12-06T13:16:54.73 10.0 positive automatic P 48 78.8875 2.6542 0.185523
US.ELK.BHZ.00 2019-12-06T13:16:52.98 10.0 negative automatic P 42 78.8487 1.01109 0.169731
IU.TUC.BHZ.00 2019-12-06T13:16:50.25 10.0 positive automatic PcP 51 77.8371 4.09529 0
US.WVOR.BHZ.00 2019-12-06T13:16:46.25 10.0 positive automatic pP 39 77.6387 1.13627 0.202538
II.PFO.BHZ.00 2019-12-06T13:16:29.47 10.0 negative automatic P 48 74.308 3.3571 0.221581
IU.QSPA.BHZ.00 2019-12-06T13:16:27.37 10.0 positive automatic P 180 74.6636 -1.07642 0.191794
BK.CMB.BHZ.00 2019-12-06T13:16:26.65 10.0 negative automatic P 42 74.0371 2.21361 0.226947
BK.SAO.BHZ.00 2019-12-06T13:16:19.80 10.0 positive automatic sP 43 72.6172 3.80331 0.256774
IU.SBA.BHZ.00 2019-12-06T13:15:17.37 10.0 positive automatic P 184 63.2069 0.64904 0
GT.VNDA.BHZ.00 2019-12-06T13:15:16.78 10.0 positive automatic P 185 63.2946 -0.536715 0.326698
IU.MBWA.BHZ.00 2019-12-06T13:15:04.57 10.0 negative automatic P 254 61.638 -1.67831 0.388277
GE.SANI.BHZ. 2019-12-06T13:14:49.52 10.0 positive automatic P 277 59.3788 -1.2742 0.420315
AU.FITZ.BHZ. 2019-12-06T13:14:29.13 10.0 negative automatic P 258 56.4554 -1.16416 0.447668
GE.FAKI.BHZ. 2019-12-06T13:14:05.22 10.0 negative automatic P 278 53.1391 -1.04019 0
AU.HTT.BHZ. 2019-12-06T13:13:03.25 10.0 positive automatic P 238 45.0782 -1.3705 0.609068
AU.TOO.BHZ.00 2019-12-06T13:12:33.58 10.0 negative automatic P 230 41.1772 0.540883 0.699772
AU.COEN.BHZ. 2019-12-06T13:12:23.67 10.0 positive automatic P 266 40.1923 -1.18264 0.761724
IU.PMG.BHZ.00 2019-12-06T13:11:59.17 10.0 negative automatic P 275 37.1408 -0.0287933 0.784761
IU.CTAO.BHZ.00 2019-12-06T13:11:55.52 10.0 positive automatic P 257 36.9123 -1.782 0.798516
AU.ARMA.BHZ. 2019-12-06T13:11:29.95 10.0 positive automatic P 238 33.889 -1.47796 0.839788
AU.EIDS.BHZ. 2019-12-06T13:11:22.00 10.0 negative automatic P 247 33.0377 -0.856456 0.8104
NZ.URZ.HHZ.10 2019-12-06T13:10:00.79 10.0 positive automatic P 195 23.9492 -1.88984 0.843882
NZ.OUZ.HHZ.10 2019-12-06T13:09:52.90 10.0 negative automatic P 205 22.3096 6.96811 0.930233
ND.KOUNC.BHZ.00 2019-12-06T13:09:24.05 10.0 positive automatic P 252 20.1567 1.30924 0
G.DZM.BHZ.00 2019-12-06T13:09:05.75 10.0 positive automatic P 246 18.6076 -0.172077 0.909091
ND.ONTNC.BHZ.00 2019-12-06T13:09:05.64 10.0 positive automatic P 245 18.6737 -0.872282 0.754717
G.SANVU.BHZ.00 2019-12-06T13:08:46.60 10.0 negative automatic P 267 16.9185 1.4465 0.454545
ND.MARNC.BHZ.00 2019-12-06T13:08:45.95 10.0 negative automatic P 246 17.023 -0.516139 0.851064
IU.FUNA.BHZ.00 2019-12-06T13:06:52.97 10.0 negative automatic P 321 8.6673 -0.795207 0.97561
II.MSVF.BHZ.00 2019-12-06T13:06:28.92 10.0 negative automatic P 248 6.8801 -0.454713 0.952381
AU.NIUE.BHZ. 2019-12-06T13:06:17.52 10.0 positive automatic P 128 6.3428 -4.35774 0.43956
IU.AFI.BHZ.00 2019-12-06T13:05:39.85 10.0 positive automatic P 68 3.6257 -4.79549 0.91954
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