ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Mwp 6.0 on date 08-10-2017 and time 16:04:42 (Italy) in region Tonga Islands [Sea: Tonga]

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

  • 08-10-2017 14:04:42 (UTC)
  • 08-10-2017 16:04:42 (UTC +02:00) Italian time
  • 09-10-2017 03:04:42 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -19.05, -175.73 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.

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 5.2
Mwp 6.0

Mwpd 6.0
2017-10-08
14:04:42
-19.05 -175.73 10 2017-10-08
14:34:26
Sala Sismica INGV-Roma 50797111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-10-08 14:04:42
Latitude -19.05
Longitude -175.73
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 50797111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 25575
Semi-minor axis of confidence ellipse (meter) 13506
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 162
Circular confidence region, given by single value of horizontal uncertainty (meter) 20645.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113.837
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 54
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.84596
Epicentral distance of station closest to the epicenter (degree) 5.48207
Epicentral distance of station farthest from the epicenter (degree) 90.59931
Number of stations at which the event was observed 48
Number of stations from which data was used for origin computation 48
Magnitudes information

Mwpd:6

Field Value
Value 6
Uncertainty 0.1
Num. used stations 9
Type of magnitude Mwpd
Reference to an origin 50797111
Agency INGV
Autore Auto added
Time of creation (UTC) 2017-10-08 14:34:26

Mwp:6

Field Value
Value 6
Uncertainty 0.1
Num. used stations 12
Type of magnitude Mwp
Reference to an origin 50797111
Agency INGV
Autore Auto added
Time of creation (UTC) 2017-10-08 14:34:26

mb:5.2

Field Value
Value 5.2
Uncertainty 0.1
Num. used stations 27
Type of magnitude mb
Reference to an origin 50797111
Agency INGV
Autore Auto added
Time of creation (UTC) 2017-10-08 14:34:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.WMOK.BHZ.00 2017-10-08T14:17:44.68 10.0 positive automatic P 53 90.5993 1.78724 0.0840543
GE.SNAA.BHZ. 2017-10-08T14:17:37.36 10.0 positive automatic P 178 89.1468 1.198 0.100045
US.AMTX.BHZ.00 2017-10-08T14:17:34.93 10.0 negative automatic PcP 52 88.4792 0.228408 0
US.RLMT.BHZ.00 2017-10-08T14:17:32.95 10.0 positive automatic P 40 87.9837 2.06007 0.10468
US.JCT.BHZ.00 2017-10-08T14:17:32.58 10.0 positive automatic PcP 57 88.1299 -0.504065 0
US.SDCO.BHZ.00 2017-10-08T14:17:30.68 10.0 negative automatic P 48 86.9535 4.66204 0.114752
C1.LL02.BHZ. 2017-10-08T14:17:29.50 10.0 negative automatic P 135 86.6683 5.2635 0.121181
US.BOZ.BHZ.00 2017-10-08T14:17:26.15 10.0 negative automatic P 39 86.7999 1.05817 0.110699
IU.ANMO.BHZ.00 2017-10-08T14:17:17.27 10.0 negative automatic P 50 84.9873 1.12038 0.120107
US.MNTX.BHZ.00 2017-10-08T14:17:13.68 10.0 positive automatic P 54 84.3136 1.16669 0.125134
US.HLID.BHZ.00 2017-10-08T14:17:11.70 10.0 negative automatic P 40 84.0339 0.382504 0.131542
UW.BRAN.BHZ. 2017-10-08T14:17:09.63 10.0 positive automatic P 37 83.762 -0.1961 0.136761
US.HAWA.BHZ.00 2017-10-08T14:17:05.08 10.0 negative automatic P 35 82.7338 0.697093 0.138839
MY.KOM.BHZ. 2017-10-08T14:17:02.07 10.0 negative automatic P 275 81.5468 3.96816 0.110751
US.ELK.BHZ.00 2017-10-08T14:17:01.03 10.0 positive automatic P 42 81.9626 0.359134 0.143489
NN.PRN.HHZ. 2017-10-08T14:16:52.63 10.0 positive automatic P 45 80.2393 1.26045 0.166424
US.TPNV.BHZ.00 2017-10-08T14:16:46.53 10.0 positive automatic P 44 79.1909 0.82902 0.147502
MX.HSIG.BHZ. 2017-10-08T14:16:45.13 10.0 negative automatic P 54 78.816 1.73157 0
II.PFO.BHZ.00 2017-10-08T14:16:36.02 10.0 negative automatic P 47 77.1945 1.44823 0.188672
BK.CMB.BHZ.00 2017-10-08T14:16:34.65 10.0 positive automatic P 42 77.1514 0.415335 0.189075
MY.KSM.BHZ. 2017-10-08T14:16:25.22 10.0 negative automatic P 277 75.3629 1.26116 0
MY.LDM.BHZ. 2017-10-08T14:15:49.42 10.0 positive automatic P 284 69.0913 2.94158 0
IU.CASY.BHZ.00 2017-10-08T14:15:27.12 10.0 positive automatic P 205 66.0889 -0.363389 0.150139
IU.MBWA.BHZ.00 2017-10-08T14:14:48.37 10.0 positive automatic P 256 60.213 -0.146399 0.418298
IU.SBA.BHZ.00 2017-10-08T14:14:46.15 10.0 positive automatic P 184 59.4148 3.14139 0.419797
GE.SANI.BHZ. 2017-10-08T14:14:40.57 10.0 positive automatic P 279 59.4483 -2.66087 0.193529
GE.SOEI.BHZ. 2017-10-08T14:14:39.77 10.0 negative automatic P 270 58.5969 2.27648 0.421661
AU.FORT.BHZ. 2017-10-08T14:13:48.55 10.0 positive automatic P 245 51.7823 0.385753 0.531037
AU.WRKA.BHZ. 2017-10-08T14:13:47.50 10.0 positive automatic P 253 51.8771 -1.44665 0.420635
II.WRAB.BHZ.00 2017-10-08T14:13:09.47 10.0 positive automatic P 260 46.8803 -1.25375 0.554494
AU.HTT.BHZ. 2017-10-08T14:12:37.82 10.0 positive automatic P 241 42.7599 -0.121301 0.711973
AU.COEN.BHZ. 2017-10-08T14:12:11.40 10.0 positive automatic P 271 39.6428 -0.84199 0.719919
AU.TOO.BHZ. 2017-10-08T14:12:02.62 10.0 positive automatic P 233 38.4601 0.227894 0.796244
AU.QLP.BHZ. 2017-10-08T14:11:53.55 10.0 positive automatic P 251 37.5087 -0.74929 0.643011
IU.PMG.BHZ.00 2017-10-08T14:11:50.67 10.0 positive automatic P 280 37.1552 -0.606616 0.370691
IU.CTAO.BHZ.00 2017-10-08T14:11:39.32 10.0 negative automatic P 262 35.7582 -0.0753672 0.811998
G.CAN.BHZ.00 2017-10-08T14:11:34.05 10.0 negative automatic P 235 35.0809 0.42157 0.825511
AU.ARMA.BHZ. 2017-10-08T14:11:04.12 10.0 positive automatic P 243 31.6103 0.676202 0.896493
AU.EIDS.BHZ. 2017-10-08T14:11:00.47 10.0 negative automatic P 252 31.2854 0.0490363 0.844377
NZ.URZ.HHZ.10 2017-10-08T14:09:12.07 10.0 negative automatic P 196 20.1964 -3.06216 0.970874
NZ.OUZ.HHZ.10 2017-10-08T14:09:01.55 10.0 positive automatic P 208 18.7272 2.49559 0.980392
ND.KOUNC.BHZ.00 2017-10-08T14:09:00.84 10.0 positive automatic P 262 18.8521 0.413056 0.909091
ND.ONTNC.BHZ.00 2017-10-08T14:08:37.45 10.0 positive automatic P 256 16.974 -0.367501 0.769231
G.DZM.BHZ.00 2017-10-08T14:08:37.35 10.0 positive automatic P 257 16.953 -0.335461 0.851064
IU.RAR.BHZ.00 2017-10-08T14:08:14.52 10.0 positive automatic P 101 15.1278 0.499047 0.465116
IU.AFI.BHZ.00 2017-10-08T14:06:10.87 10.0 positive automatic P 37 6.3825 -3.61597 0.615385
II.MSVF.BHZ.00 2017-10-08T14:06:07.47 10.0 positive automatic P 281 6.043 -2.36642 0.43956
AU.NIUE.BHZ. 2017-10-08T14:06:01.25 10.0 negative automatic P 91 5.4821 -0.762337 0.963855
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