Earthquake with magnitude of Mwp 6.1 on date 28-04-2015 and time 18:39:40 (Italy) in region Fiji Islands region [Sea: Fiji]

A magnitude Mwp 6.1 earthquake occured in region: Fiji Islands region [Sea: Fiji], on

  • 28-04-2015 16:39:40 (UTC)
  • 28-04-2015 18:39:40 (UTC +02:00) Italian time
  • 29-04-2015 05:39:40 (UTC +13:00) local time in the region of the earthquake (Pacific/Tongatapu)

and geographic coordinates (lat, lon) -20.9, -178.57 at 580 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

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
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 5.9
Mwp 6.1

Mwpd 6.4
2015-04-28
16:39:40
-20.9 -178.57 580 2015-04-28
17:04:46
Sala Sismica INGV-Roma 18754741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-04-28 16:39:40
Latitude -20.90
Longitude -178.57
Depth (km) 580 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 18754741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 12484
Semi-minor axis of confidence ellipse (meter) 7545
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 300
Circular confidence region, given by single value of horizontal uncertainty (meter) 11195.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81.7435
Number of associated phases, regardless of their use for origin computation 109
Number of defining phases 109
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.41761
Epicentral distance of station closest to the epicenter (degree) 4.48619
Epicentral distance of station farthest from the epicenter (degree) 91.38107
Number of stations at which the event was observed 97
Number of stations from which data was used for origin computation 97
Magnitudes information

Mwpd:6.4

Field Value
Value 6.4
Uncertainty 0.1
Num. used stations 51
Type of magnitude Mwpd
Reference to an origin 18754741
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-04-28 17:04:48

Mwp:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 55
Type of magnitude Mwp
Reference to an origin 18754741
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-04-28 17:04:48

mb:5.9

Field Value
Value 5.9
Uncertainty 0.3
Num. used stations 74
Type of magnitude mb
Reference to an origin 18754741
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-04-28 17:04:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.JCT.BHZ.00 2015-04-28T16:51:43.95 10.0 negative automatic P 58 91.3811 0.120797 0.0706099
IU.CHTO.BHZ.00 2015-04-28T16:51:38.72 10.0 negative automatic P 290 89.9626 1.46467 0.0955069
IW.SMCO.BHZ.00 2015-04-28T16:51:37.53 10.0 negative automatic P 47 89.8116 0.450241 0.096557
IU.COLA.BHZ.00 2015-04-28T16:51:30.62 10.0 negative automatic P 13 88.9644 -1.97549 0
IU.ANMO.BHZ.00 2015-04-28T16:51:30.32 10.0 negative automatic P 51 88.2308 0.855981 0.106611
G.AIS.BHZ.00 2015-04-28T16:51:28.35 10.0 negative automatic P 230 87.5984 2.14631 0.11398
GE.SNAA.BHZ. 2015-04-28T16:51:25.66 10.0 positive automatic P 179 87.3748 0.358966 0.11031
GE.LHMI.BHZ. 2015-04-28T16:51:23.72 10.0 negative automatic P 277 86.732 1.57408 0.115067
US.HAWA.BHZ.00 2015-04-28T16:51:18.23 10.0 negative automatic P 36 85.8026 0.405841 0.118006
AT.CRAG.BHZ. 2015-04-28T16:51:17.22 10.0 positive automatic P 24 85.5476 0.666321 0.124675
GE.GSI.BHZ. 2015-04-28T16:51:14.32 10.0 negative automatic P 273 84.7248 1.71773 0.133677
US.WUAZ.BHZ.00 2015-04-28T16:51:14.98 10.0 negative automatic P 49 84.9816 0.874104 0.120148
US.NLWA.BHZ.00 2015-04-28T16:51:10.25 10.0 negative automatic P 34 84.0942 0.642708 0.140542
IU.TUC.BHZ.00 2015-04-28T16:51:10.07 10.0 negative automatic P 52 83.8084 1.8159 0.141254
US.WVOR.BHZ.00 2015-04-28T16:51:09.73 10.0 negative automatic P 40 83.9877 0.517973 0.141439
IU.MA2.BHZ.00 2015-04-28T16:51:08.52 10.0 negative automatic P 345 84.299 -2.03965 0.137172
NN.PRN.HHZ. 2015-04-28T16:51:07.55 10.0 negative automatic P 46 83.4426 1.00813 0.132362
TM.UBPT.BHZ. 2015-04-28T16:51:04.44 10.0 negative automatic P 289 82.8379 1.14404 0.146714
IU.COR.BHZ.00 2015-04-28T16:51:03.12 10.0 negative automatic P 36 82.6069 0.980665 0.147985
US.TPNV.BHZ.00 2015-04-28T16:51:02.00 10.0 negative automatic P 46 82.3928 0.683582 0.148084
BK.HUMO.BHZ.00 2015-04-28T16:50:58.02 10.0 negative automatic P 38 81.5566 1.11882 0.162702
IU.SLBS.BHZ.00 2015-04-28T16:50:52.27 10.0 negative automatic P 60 80.2991 1.78531 0.164381
BK.CMB.BHZ.00 2015-04-28T16:50:51.12 10.0 negative automatic P 43 80.3212 0.54296 0
BK.WDC.BHZ.00 2015-04-28T16:50:50.90 10.0 positive automatic P 40 80.5373 -0.722474 0.176308
MY.KOM.BHZ. 2015-04-28T16:50:45.67 10.0 positive automatic P 276 79.0657 1.77554 0
BK.SAO.BHZ.00 2015-04-28T16:50:44.02 10.0 negative automatic P 43 78.8868 1.02744 0.187765
BK.MCCM.BHZ.00 2015-04-28T16:50:43.37 10.0 negative automatic P 41 78.8256 0.757918 0.183929
CI.PHL.BHZ. 2015-04-28T16:50:42.65 10.0 negative automatic P 45 78.6659 0.816701 0.167695
IU.INCN.BHZ.00 2015-04-28T16:50:37.32 10.0 negative automatic P 318 77.8629 -0.16734 0.186613
IU.YSS.BHZ.00 2015-04-28T16:50:28.50 10.0 negative automatic P 334 76.2842 -0.43886 0.211379
G.PPTF.BHZ.00 2015-04-28T16:50:28.00 10.0 negative automatic ScP 88 27.5455 3.87078 0
IU.PET.BHZ.00 2015-04-28T16:50:27.95 10.0 negative automatic P 346 76.521 -2.28258 0.182839
AT.AKUT.BHZ. 2015-04-28T16:50:23.94 10.0 positive automatic P 8 75.8408 -2.54528 0.224505
JP.JTU.BHZ. 2015-04-28T16:50:16.40 10.0 negative automatic P 318 74.2582 -1.27729 0.222093
IU.TATO.BHZ.00 2015-04-28T16:50:16.02 10.0 negative automatic P 305 74.1153 -0.872535 0.228762
JP.JEW.BHZ. 2015-04-28T16:50:13.65 10.0 negative automatic P 331 73.6039 -0.353491 0.245611
AT.SMY.BHZ. 2015-04-28T16:50:13.45 10.0 positive automatic P 355 73.907 -2.24943 0.230964
MY.KSM.BHZ. 2015-04-28T16:50:11.37 10.0 negative automatic P 278 72.9591 1.0524 0.252879
AK.ATKA.BHZ. 2015-04-28T16:50:09.29 10.0 negative automatic P 3 73.2033 -2.41889 0.244159
JP.YOJ.BHZ. 2015-04-28T16:50:08.10 10.0 negative automatic P 306 72.6871 -0.66017 0.24407
IU.ADK.BHZ.00 2015-04-28T16:50:07.17 10.0 negative automatic P 1 72.8018 -2.26176 0.237305
JP.JHS.BHZ. 2015-04-28T16:50:06.00 10.0 negative automatic P 320 72.285 -0.52337 0.242823
JP.JNU.BHZ. 2015-04-28T16:50:06.15 10.0 negative automatic P 317 72.4126 -1.11578 0.236088
JP.JEM.BHZ. 2015-04-28T16:50:05.50 10.0 negative automatic P 331 72.178 -0.328844 0.249647
II.ERM.BHZ.00 2015-04-28T16:50:05.52 10.0 negative automatic P 331 72.1735 -0.283525 0.249696
JP.JTM.BHZ. 2015-04-28T16:50:04.90 10.0 negative automatic P 329 72.1897 -1.01199 0.243847
GE.CISI.BHZ. 2015-04-28T16:50:04.87 10.0 positive automatic P 269 72.0479 -0.296553 0.25706
MY.SBM.BHZ. 2015-04-28T16:50:03.47 10.0 positive automatic P 280 71.5799 1.06525 0.256278
JP.JSU.BHZ. 2015-04-28T16:50:02.15 10.0 negative automatic P 316 71.6365 -0.61046 0.261734
JP.JSD.BHZ. 2015-04-28T16:50:00.95 10.0 negative automatic P 325 71.5325 -1.1632 0.250971
JP.JMN.BHZ. 2015-04-28T16:49:58.50 10.0 negative automatic P 320 70.9579 -0.329932 0.257285
NZ.OUZ.HHZ.10 2015-04-28T16:49:58.66 10.0 positive automatic ScP 204 15.8831 4.52531 0
JP.JWT.BHZ. 2015-04-28T16:49:58.90 10.0 negative automatic P 322 71.1334 -0.892121 0.255348
IU.MAJO.BHZ.00 2015-04-28T16:49:54.47 10.0 negative automatic P 324 70.4605 -1.41671 0.275328
JP.JOW.BHZ. 2015-04-28T16:49:54.35 10.0 negative automatic P 311 70.1956 0.0583875 0.278437
JP.JGF.BHZ. 2015-04-28T16:49:53.20 10.0 negative automatic P 323 70.2445 -1.44201 0.284639
JP.JMM.BHZ. 2015-04-28T16:49:52.25 10.0 negative automatic P 327 70.0851 -1.36898 0.267023
MY.KKM.BHZ. 2015-04-28T16:49:50.17 10.0 negative automatic P 285 69.3944 0.52913 0.28125
JP.JSG.BHZ. 2015-04-28T16:49:47.35 10.0 negative automatic P 323 69.106 -0.444357 0.284634
JP.JYT.BHZ. 2015-04-28T16:49:47.10 10.0 negative automatic P 325 69.1567 -0.985429 0.2908
MY.LDM.BHZ. 2015-04-28T16:49:37.07 10.0 negative automatic P 286 66.9694 2.20498 0.317706
JP.JMZ.BHZ. 2015-04-28T16:49:36.90 10.0 negative automatic P 312 67.4888 -1.11109 0.297064
JP.JHJ2.BHZ. 2015-04-28T16:49:34.30 10.0 negative automatic P 323 67.04 -0.976713 0.316819
GE.JAGI.BHZ. 2015-04-28T16:49:27.02 10.0 negative automatic P 270 65.8256 -0.779651 0.317149
II.KAPI.BHZ.00 2015-04-28T16:49:02.47 10.0 negative automatic P 276 61.7878 0.284876 0.368644
GE.LUWI.BHZ. 2015-04-28T16:48:54.47 10.0 negative automatic P 281 60.5039 0.72056 0.377255
GE.MMRI.BHZ. 2015-04-28T16:48:38.72 10.0 positive automatic P 273 58.2208 0.133843 0.447893
IU.SBA.BHZ.00 2015-04-28T16:48:35.85 10.0 positive automatic P 184 57.38 2.95919 0.439261
IU.NWAO.BHZ.00 2015-04-28T16:48:35.37 10.0 negative automatic P 243 57.6305 0.727686 0.445981
GT.VNDA.BHZ.00 2015-04-28T16:48:35.03 10.0 positive automatic P 185 57.4081 1.93119 0.4493
GE.TNTI.BHZ. 2015-04-28T16:48:31.07 10.0 negative automatic P 285 57.0809 0.219098 0.454205
IU.MBWA.BHZ.00 2015-04-28T16:48:31.97 10.0 negative automatic P 258 57.1882 0.364235 0.452593
GE.SANI.BHZ. 2015-04-28T16:48:30.97 10.0 negative automatic P 282 57.1545 -0.378865 0.4137
GE.SOEI.BHZ. 2015-04-28T16:48:25.27 10.0 negative automatic P 272 55.962 1.90758 0.471181
GE.BNDI.BHZ. 2015-04-28T16:47:59.67 10.0 negative automatic P 281 52.5852 0.129537 0.500476
GE.FAKI.BHZ. 2015-04-28T16:47:48.57 10.0 negative automatic P 284 51.0924 -0.284211 0.548696
IU.GUMO.BHZ.00 2015-04-28T16:47:39.02 10.0 negative automatic P 311 49.7934 -0.405722 0.557107
IU.POHA.BHZ.00 2015-04-28T16:47:14.77 10.0 positive automatic P 31 46.4901 -0.452631 0.598865
GE.GENI.BHZ. 2015-04-28T16:46:57.47 10.0 negative automatic P 289 44.1371 0.501068 0.654072
II.WRAB.BHZ.00 2015-04-28T16:46:55.62 10.0 negative automatic P 263 43.9595 -0.036971 0.657242
G.TAOE.BHZ.00 2015-04-28T16:46:17.56 10.0 positive automatic P 78 38.9134 1.55914 0.747051
GE.PMG.BHZ.00 2015-04-28T16:45:43.72 10.0 negative automatic P 284 34.924 0.442253 0.828655
IU.CTAO.BHZ.00 2015-04-28T16:45:27.12 10.0 negative automatic P 265 32.8907 0.788942 0.890676
II.KWAJ.BHZ.00 2015-04-28T16:45:23.67 10.0 negative automatic P 334 32.6604 -0.660557 0.83583
G.CAN.BHZ.00 2015-04-28T16:45:18.30 10.0 negative automatic P 236 31.8277 0.896088 0.891957
IU.XMAS.BHZ.00 2015-04-28T16:45:09.72 10.0 positive automatic P 45 30.8932 0.386193 0.901044
G.PPTF.BHZ.00 2015-04-28T16:44:42.20 10.0 positive automatic P 88 27.5455 1.6446 0.930233
ND.MARNC.BHZ.00 2015-04-28T16:44:41.74 10.0 negative automatic S 265 12.5015 5.37321 0
NZ.ODZ.HHZ.10 2015-04-28T16:44:23.03 10.0 negative automatic P 198 25.7251 -1.50375 0.952381
NZ.KHZ.HHZ.10 2015-04-28T16:43:53.95 10.0 positive automatic P 195 22.5092 -2.10177 0.934579
IU.SNZO.BHZ.00 2015-04-28T16:43:42.17 10.0 positive automatic P 194 21.1831 -2.04727 0.930233
IU.AFI.BHZ.00 2015-04-28T16:43:38.37 10.0 negative automatic S 44 9.5324 -3.35333 0
IU.RAR.BHZ.00 2015-04-28T16:43:12.47 10.0 positive automatic P 94 17.5338 1.32627 0.888889
NZ.URZ.HHZ.10 2015-04-28T16:43:09.75 10.0 positive automatic P 191 17.7519 -3.39773 0.938967
ND.KOUNC.BHZ.00 2015-04-28T16:42:59.49 10.0 positive automatic P 268 16.0291 2.1144 0.952381
NZ.OUZ.HHZ.10 2015-04-28T16:42:57.48 10.0 positive automatic P 204 15.8831 1.44594 0.934579
G.DZM.BHZ.00 2015-04-28T16:42:38.05 10.0 positive automatic P 262 13.9864 0.13791 0.952381
ND.MARNC.BHZ.00 2015-04-28T16:42:22.79 10.0 positive automatic P 265 12.5015 0.12971 0.952381
IU.AFI.BHZ.00 2015-04-28T16:41:50.82 10.0 positive automatic P 44 9.5324 -1.95808 0.952381
IU.RAO.BHZ.00 2015-04-28T16:41:40.42 10.0 positive automatic P 176 8.3609 -0.694374 0.963855
II.MSVF.BHZ.00 2015-04-28T16:41:08.32 10.0 positive automatic P 314 4.4862 1.61215 0.97561
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download