Earthquake with magnitude of Mwp 6.8 on date 20-10-2015 and time 23:52:02 (Italy) in region Vanuatu Islands [Sea: Vanuatu]

A magnitude Mwp 6.8 earthquake occured in region: Vanuatu Islands [Sea: Vanuatu], on

  • 20-10-2015 21:52:02 (UTC)
  • 20-10-2015 23:52:02 (UTC +02:00) Italian time
  • 21-10-2015 08:52:02 (UTC +11:00) local time in the region of the earthquake (Pacific/Efate)

and geographic coordinates (lat, lon) -14.82, 167.32 at 135 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 6.5
Mwp 6.8

Mwpd 7.0
2015-10-20
21:52:02
-14.81 167.32 135 2015-10-20
22:13:52
Sala Sismica INGV-Roma 21889971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-10-20 21:52:02
Latitude -14.81
Longitude 167.32
Depth (km) 135 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 21889971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 12987
Semi-minor axis of confidence ellipse (meter) 8212
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 10664.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 31.771
Number of associated phases, regardless of their use for origin computation 108
Number of defining phases 108
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.23534
Epicentral distance of station closest to the epicenter (degree) 0.64255
Epicentral distance of station farthest from the epicenter (degree) 75.59047
Number of stations at which the event was observed 94
Number of stations from which data was used for origin computation 94
Magnitudes information

Mwpd:7

Field Value
Value 7
Uncertainty 0.3
Num. used stations 70
Type of magnitude Mwpd
Reference to an origin 21889971
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-10-20 22:13:53

Mwp:6.8

Field Value
Value 6.8
Uncertainty 0.3
Num. used stations 80
Type of magnitude Mwp
Reference to an origin 21889971
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-10-20 22:13:53

mb:6.5

Field Value
Value 6.5
Uncertainty 0.3
Num. used stations 83
Type of magnitude mb
Reference to an origin 21889971
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-10-20 22:13:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.MA2.BHZ.00 2015-10-20T22:03:29.82 10.0 negative automatic P 351 75.5905 -1.64136 0.203983
IU.CHTO.BHZ.00 2015-10-20T22:03:30.37 10.0 positive automatic P 294 75.2382 0.902785 0.227663
IU.QSPA.BHZ.00 2015-10-20T22:03:28.62 10.0 positive automatic P 180 75.1164 -0.567578 0.223526
AU.HTT.BHZ. 2015-10-20T22:03:16.70 10.0 positive automatic S 229 31.7239 5.30837 0
GE.LHMI.BHZ. 2015-10-20T22:03:14.52 10.0 positive automatic P 280 72.5362 0.853806 0.215629
GE.GSI.BHZ. 2015-10-20T22:03:04.12 10.0 positive automatic P 277 70.8031 0.800415 0.277949
PS.PSI.BHZ. 2015-10-20T22:02:57.76 10.0 positive automatic P 279 69.9062 -0.255007 0.275297
AK.ATKA.BHZ. 2015-10-20T22:02:48.59 10.0 positive automatic P 12 68.9037 -3.11061 0.225212
TM.UBPT.BHZ. 2015-10-20T22:02:47.84 10.0 positive automatic P 294 68.1225 0.982245 0.306289
IU.ADK.BHZ.00 2015-10-20T22:02:45.22 10.0 positive automatic P 11 68.1277 -1.67178 0.283088
JP.JEM.BHZ. 2015-10-20T22:02:35.25 10.0 positive automatic pP 340 61.0424 2.12057 0
IU.YSS.BHZ.00 2015-10-20T22:02:30.15 10.0 positive automatic P 342 65.5877 -0.669788 0.299644
IU.INCN.BHZ.00 2015-10-20T22:02:24.27 10.0 positive automatic P 325 64.7773 -1.30598 0.269006
GE.MNAI.BHZ. 2015-10-20T22:02:21.07 10.0 positive automatic P 272 64.1184 -0.235641 0.163645
IU.CASY.BHZ.00 2015-10-20T22:02:16.42 10.0 positive automatic P 202 63.438 -0.403777 0.36366
IU.SBA.BHZ.00 2015-10-20T22:02:14.65 10.0 positive automatic P 180 63.0322 0.485316 0.364796
GT.VNDA.BHZ.00 2015-10-20T22:02:11.83 10.0 positive automatic P 181 62.7609 -0.556128 0.372824
JP.JEW.BHZ. 2015-10-20T22:02:07.55 10.0 positive automatic P 339 62.3574 -2.15974 0.174619
JP.JEM.BHZ. 2015-10-20T22:02:00.05 10.0 positive automatic P 340 61.0424 -0.82872 0.314286
JP.JTU.BHZ. 2015-10-20T22:02:00.75 10.0 positive automatic P 325 61.094 -0.484237 0.377881
JP.JTM.BHZ. 2015-10-20T22:01:56.95 10.0 positive automatic P 337 60.6974 -1.60869 0.374696
AU.XMI.BHZ. 2015-10-20T22:01:56.55 10.0 negative automatic P 266 60.1245 1.8514 0.395475
IU.TATO.BHZ.00 2015-10-20T22:01:52.42 10.0 negative automatic P 311 59.8154 -0.146632 0.414024
JP.JSD.BHZ. 2015-10-20T22:01:48.85 10.0 positive automatic P 334 59.4697 -1.34671 0.409257
JP.JHS.BHZ. 2015-10-20T22:01:48.70 10.0 positive automatic P 328 59.4509 -1.42517 0.391321
JP.JNU.BHZ. 2015-10-20T22:01:47.55 10.0 positive automatic P 325 59.2292 -1.06266 0.412656
GE.CISI.BHZ. 2015-10-20T22:01:44.47 10.0 positive automatic P 270 58.6696 -0.282467 0.401925
JP.JWT.BHZ. 2015-10-20T22:01:42.30 10.0 positive automatic P 330 58.5248 -1.38891 0.413085
JP.YOJ.BHZ. 2015-10-20T22:01:42.90 10.0 negative automatic P 312 58.4131 0.00590385 0.424294
JP.JSU.BHZ. 2015-10-20T22:01:41.00 10.0 positive automatic P 323 58.2792 -1.02394 0.407275
JP.JMM.BHZ. 2015-10-20T22:01:40.20 10.0 positive automatic P 336 58.2727 -1.72713 0.316059
JP.JMN.BHZ. 2015-10-20T22:01:39.60 10.0 positive automatic P 327 58.0676 -0.978142 0.419514
IU.MAJO.BHZ.00 2015-10-20T22:01:39.72 10.0 positive automatic P 333 58.2441 -2.06273 0.436885
G.INU.BHZ.00 2015-10-20T22:01:37.11 10.0 positive automatic P 331 57.7948 -1.49324 0.396351
JP.JGF.BHZ. 2015-10-20T22:01:37.40 10.0 positive automatic P 331 57.8511 -1.67582 0.357565
JP.JYT.BHZ. 2015-10-20T22:01:32.80 10.0 positive automatic P 334 57.1167 -1.03665 0.381079
GE.SMRI.BHZ. 2015-10-20T22:01:30.22 10.0 positive automatic P 271 56.2453 2.50906 0.400159
JP.JOW.BHZ. 2015-10-20T22:01:28.65 10.0 negative automatic P 318 56.3213 0.397273 0.454865
JP.JMZ.BHZ. 2015-10-20T22:01:09.80 10.0 negative automatic P 319 53.7129 0.308793 0.50625
II.TAU.BHZ.00 2015-10-20T21:58:22.67 10.0 positive automatic P 207 32.9154 -0.23482 0.830809
GE.JAGI.BHZ. 2015-10-20T22:00:58.87 10.0 positive automatic P 271 52.3459 -0.630391 0.515896
GE.BKB.BHZ. 2015-10-20T22:00:57.37 10.0 positive automatic P 281 51.6202 3.25497 0.436161
G.TAOE.BHZ.00 2015-10-20T22:00:55.84 10.0 positive automatic P 90 51.6475 1.40218 0.501363
AU.GIRL.BHZ. 2015-10-20T22:00:48.52 10.0 positive automatic P 253 50.6288 1.80087 0.563086
IU.POHA.BHZ.00 2015-10-20T22:00:44.47 10.0 positive automatic P 48 50.2948 -0.0679524 0.502172
G.KIP.BHZ.00 2015-10-20T22:00:40.07 10.0 negative automatic P 44 49.6949 0.381282 0.500527
AU.MORW.BHZ. 2015-10-20T22:00:36.27 10.0 positive automatic P 244 49.2474 -0.0603112 0.586589
IU.NWAO.BHZ.00 2015-10-20T22:00:32.02 10.0 positive automatic P 239 48.722 -0.320975 0.574877
GE.LUWI.BHZ. 2015-10-20T22:00:12.87 10.0 positive automatic P 283 46.0916 0.93112 0.634441
IU.MBWA.BHZ.00 2015-10-20T22:00:07.87 10.0 negative automatic P 255 45.5434 0.195639 0.644218
GE.SANI.BHZ. 2015-10-20T21:59:45.42 10.0 negative automatic P 283 42.7251 0.217851 0.679488
GE.SOEI.BHZ. 2015-10-20T21:59:43.37 10.0 positive automatic P 272 42.3072 1.36706 0.687102
GE.TNTI.BHZ. 2015-10-20T21:59:43.92 10.0 negative automatic P 288 42.4746 0.738541 0.323231
G.PPTF.BHZ.00 2015-10-20T21:59:35.80 10.0 positive automatic P 100 41.4066 1.1768 0.570894
AU.MCQ.BHZ. 2015-10-20T21:59:24.35 10.0 positive automatic P 188 40.215 -0.394762 0.709372
AU.FITZ.BHZ. 2015-10-20T21:59:22.74 10.0 negative automatic P 259 40.0269 -0.466492 0.737987
AU.FORT.BHZ. 2015-10-20T21:59:17.20 10.0 positive automatic P 239 39.2902 0.0751738 0.779606
IU.XMAS.BHZ.00 2015-10-20T21:59:13.25 10.0 positive automatic P 67 38.7343 0.774215 0.728535
GE.BNDI.BHZ. 2015-10-20T21:59:08.32 10.0 negative automatic P 282 38.2221 0.127949 0.505272
AU.WRKA.BHZ. 2015-10-20T21:59:05.15 10.0 negative automatic P 248 37.9362 -0.757446 0.78762
GE.FAKI.BHZ. 2015-10-20T21:58:54.72 10.0 negative automatic P 286 36.5606 0.503321 0.778039
IU.GUMO.BHZ.00 2015-10-20T21:58:50.52 10.0 negative automatic P 321 36.0608 0.546121 0.805995
GE.SAUI.BHZ. 2015-10-20T21:58:50.57 10.0 negative automatic P 277 35.9193 1.80906 0.382179
AU.MTN.BHZ. 2015-10-20T21:58:42.45 10.0 negative automatic P 269 35.1571 0.187591 0.81451
IU.WAKE.BHZ.00 2015-10-20T21:58:33.47 10.0 negative automatic P 359 34.1031 0.296843 0.790086
AU.KDU.BHZ. 2015-10-20T21:58:30.57 10.0 positive automatic P 269 33.8828 -0.706578 0.830369
IU.RAR.BHZ.00 2015-10-20T21:58:14.57 10.0 positive automatic P 106 31.8752 0.759763 0.83286
AU.HTT.BHZ. 2015-10-20T21:58:13.22 10.0 positive automatic P 229 31.7239 0.620513 0.915408
II.WRAB.BHZ.00 2015-10-20T21:58:11.77 10.0 negative automatic P 256 31.8174 -1.59245 0.833986
AU.TOO.BHZ. 2015-10-20T21:57:56.40 10.0 positive automatic P 216 29.8633 0.173786 0.91954
NZ.KHZ.HHZ.10 2015-10-20T21:57:38.41 10.0 positive automatic P 170 28.1146 -2.23344 0.896861
AU.MILA.BHZ. 2015-10-20T21:57:35.05 10.0 positive automatic P 213 27.4816 -0.0979774 0.930233
G.CAN.BHZ.00 2015-10-20T21:57:24.40 10.0 positive automatic P 215 26.2784 0.0367717 0.888889
NZ.URZ.HHZ.10 2015-10-20T21:57:11.29 10.0 positive automatic P 162 24.9888 -1.33612 0.925926
AU.QLP.BHZ. 2015-10-20T21:57:09.02 10.0 negative automatic P 238 24.5279 0.555602 0.941176
AU.RIV.BHZ. 2015-10-20T21:57:03.80 10.0 positive automatic P 215 23.9784 0.356603 0.97561
IU.KNTN.BHZ.00 2015-10-20T21:57:03.22 10.0 positive automatic P 62 23.9195 0.317958 0.43956
II.KWAJ.BHZ.00 2015-10-20T21:56:59.62 10.0 positive automatic P 1 23.6175 -0.529141 0.97561
AU.MANU.BHZ. 2015-10-20T21:56:58.87 10.0 positive automatic P 301 23.4718 0.0248968 0.888889
AU.COEN.BHZ. 2015-10-20T21:56:58.60 10.0 positive automatic P 269 23.3933 0.446643 0.963855
AU.NIUE.BHZ. 2015-10-20T21:56:45.32 10.0 positive automatic P 104 22.1571 -1.12753 0.952381
AU.ARMA.BHZ. 2015-10-20T21:56:38.12 10.0 positive automatic P 220 21.2389 1.20077 0.963855
NZ.OUZ.HHZ.10 2015-10-20T21:56:36.50 10.0 positive automatic P 166 21.1694 0.499957 0.956938
IU.CTAO.BHZ.00 2015-10-20T21:56:32.57 10.0 negative automatic P 252 20.7581 0.903166 0.952381
GE.PMG.BHZ.00 2015-10-20T21:56:29.02 10.0 negative automatic P 283 20.4331 0.880392 0.909091
IU.RAO.BHZ.00 2015-10-20T21:56:20.77 10.0 positive automatic P 139 19.8369 -0.957663 0.952381
AU.EIDS.BHZ. 2015-10-20T21:56:09.10 10.0 positive automatic P 233 18.5167 1.65733 0.909091
AU.LHI.BHZ. 2015-10-20T21:56:05.00 10.0 positive automatic P 203 18.3318 0.597134 0.941176
AU.RABL.BHZ. 2015-10-20T21:56:03.32 10.0 negative automatic P 304 18.3196 -1.97956 0.8
IU.TARA.BHZ.00 2015-10-20T21:55:52.22 10.0 positive automatic P 19 17.0927 0.413383 0.91954
IU.HNR.BHZ.00 2015-10-20T21:55:51.77 10.0 positive automatic S 306 8.9905 4.99141 0
G.DZM.BHZ.00 2015-10-20T21:55:11.90 10.0 negative automatic S 186 7.304 5.63834 0
II.MSVF.BHZ.00 2015-10-20T21:54:35.52 10.0 positive automatic P 107 10.7063 4.27263 0.97561
IU.HNR.BHZ.00 2015-10-20T21:54:09.42 10.0 negative automatic P 306 8.9905 1.16154 0.941176
G.DZM.BHZ.00 2015-10-20T21:53:45.15 10.0 positive automatic P 186 7.304 -0.592575 0.930233
ND.MARNC.BHZ.00 2015-10-20T21:53:34.94 10.0 positive automatic P 174 6.6996 -2.52652 0.909091
ND.KOUNC.BHZ.00 2015-10-20T21:53:33.74 10.0 negative automatic P 206 6.4228 -0.0156521 0.930233
G.SANVU.BHZ.00 2015-10-20T21:52:36.90 10.0 positive automatic S 190 0.6425 0.322407 0
G.SANVU.BHZ.00 2015-10-20T21:52:21.00 10.0 positive automatic P 190 0.6425 -1.05013 0.952381
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