INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Mwp 6.8 on date 22-05-2015 and time 21:45:17 (UTC) in region Solomon Is. [Sea]

A magnitude Mwp 6.8 earthquake occured in region: Solomon Is. [Sea], on

  • 22-05-2015 21:45:17 (UTC)
  • 22-05-2015 23:45:17 (UTC +02:00) Italian time
  • 23-05-2015 08:45:17 (UTC +11:00) local time in the region of the earthquake (Pacific/Guadalcanal)

and geographic coordinates (lat, lon) -11.06, 163.56 at 1 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 6.8

Mwpd 7.0
2015-05-22
21:45:17
-11.06 163.56 1 2015-05-22
22:06:13
Sala Sismica INGV-Roma 19287621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-05-22 21:45:17
Latitude -11.06
Longitude 163.56
Depth (km) 1 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 19287621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 18596
Semi-minor axis of confidence ellipse (meter) 13584
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 83
Circular confidence region, given by single value of horizontal uncertainty (meter) 15020
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 46.5726
Number of associated phases, regardless of their use for origin computation 71
Number of defining phases 71
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.76917
Epicentral distance of station closest to the epicenter (degree) 9.51593
Epicentral distance of station farthest from the epicenter (degree) 84.21829
Number of stations at which the event was observed 63
Number of stations from which data was used for origin computation 63
Magnitudes information

Mwpd:7

Field Value
Value 7
Uncertainty 0.2
Num. used stations 49
Type of magnitude Mwpd
Reference to an origin 19287621
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-05-22 22:06:14

Mwp:6.8

Field Value
Value 6.8
Uncertainty 0.1
Num. used stations 53
Type of magnitude Mwp
Reference to an origin 19287621
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-05-22 22:06:14

mb:5.9

Field Value
Value 5.9
Uncertainty 0.3
Num. used stations 57
Type of magnitude mb
Reference to an origin 19287621
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-05-22 22:06:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.COLA.BHZ.00 2015-05-22T21:57:46.37 10.0 positive automatic P 19 84.1417 -2.5549 0.105744
GE.HALK.BHZ. 2015-05-22T21:57:50.45 10.0 negative automatic P 277 84.2183 1.14853 0
IU.BILL.BHZ.00 2015-05-22T21:57:21.27 10.0 positive automatic P 1 79.1493 -1.29591 0.170816
IU.ULN.BHZ.00 2015-05-22T21:57:11.87 10.0 negative automatic P 325 77.2226 -0.234627 0.201866
IU.YAK.BHZ.00 2015-05-22T21:57:15.77 10.0 positive automatic P 344 77.7153 1.16577 0.179832
IN.PBA.HHZ. 2015-05-22T21:56:58.21 10.0 positive automatic P 286 73.9073 4.96195 0
IU.MA2.BHZ.00 2015-05-22T21:56:37.47 10.0 positive automatic P 353 71.3795 -0.35705 0.258521
IU.CHTO.BHZ.00 2015-05-22T21:56:31.62 10.0 negative automatic P 295 70.338 0.109588 0.264184
IU.SBA.BHZ.00 2015-05-22T21:56:11.77 10.0 negative automatic P 179 66.8062 2.38907 0.308737
GE.GSI.BHZ. 2015-05-22T21:56:08.87 10.0 positive automatic P 276 66.7311 -0.0398652 0.306134
IU.CASY.BHZ.00 2015-05-22T21:56:02.52 10.0 positive automatic P 201 65.5965 0.917195 0.156429
MY.KUM.BHZ. 2015-05-22T21:55:55.22 10.0 negative automatic P 281 64.6962 -0.551589 0.274927
IU.YSS.BHZ.00 2015-05-22T21:55:32.65 10.0 negative automatic P 344 60.9195 2.03744 0.355954
JP.JEW.BHZ. 2015-05-22T21:55:09.30 10.0 positive automatic P 341 57.5698 1.87521 0
AU.XMI.BHZ. 2015-05-22T21:55:01.72 10.0 negative automatic P 265 56.7594 0.0197975 0.211871
JP.JTM.BHZ. 2015-05-22T21:54:57.20 10.0 positive automatic P 340 55.8585 1.9511 0.461775
JP.JSD.BHZ. 2015-05-22T21:54:47.80 10.0 positive automatic P 336 54.5049 2.32343 0.482277
MY.KSM.BHZ. 2015-05-22T21:54:43.12 10.0 negative automatic P 280 54.3991 -1.57993 0.320116
JP.JNU.BHZ. 2015-05-22T21:54:41.40 10.0 negative automatic P 326 54.0549 -0.86914 0.389541
JP.JMM.BHZ. 2015-05-22T21:54:39.15 10.0 negative automatic P 338 53.369 1.98353 0.488464
JP.YOJ.BHZ. 2015-05-22T21:54:39.25 10.0 positive automatic P 312 53.1746 3.52703 0.237615
JP.JWT.BHZ. 2015-05-22T21:54:36.55 10.0 negative automatic P 331 53.4502 -1.22679 0.466044
IU.MAJO.BHZ.00 2015-05-22T21:54:35.97 10.0 positive automatic P 335 53.2503 -0.377881 0.501676
JP.JSU.BHZ. 2015-05-22T21:54:34.35 10.0 negative automatic P 324 53.0821 -0.75188 0.417023
MY.SBM.BHZ. 2015-05-22T21:54:33.17 10.0 positive automatic P 282 52.8206 0.0209501 0.496854
JP.JGF.BHZ. 2015-05-22T21:54:33.90 10.0 positive automatic P 333 52.8212 0.687507 0.397475
JP.JMN.BHZ. 2015-05-22T21:54:33.05 10.0 negative automatic P 329 52.9424 -1.04883 0.239333
G.INU.BHZ.00 2015-05-22T21:54:31.06 10.0 negative automatic P 333 52.7536 -1.57325 0.240735
JP.JOW.BHZ. 2015-05-22T21:54:22.95 10.0 positive automatic P 319 51.0768 2.81009 0.461123
IU.POHA.BHZ.00 2015-05-22T21:54:19.97 10.0 positive automatic P 53 50.712 2.27119 0.542095
JP.JHJ2.BHZ. 2015-05-22T21:54:10.25 10.0 positive automatic P 334 49.6345 1.05605 0.559727
MY.KKM.BHZ. 2015-05-22T21:54:10.72 10.0 negative automatic P 288 50.1215 -2.3126 0.260704
AU.GIRL.BHZ. 2015-05-22T21:54:02.02 10.0 negative automatic P 249 48.3742 2.48353 0.381228
GE.JAGI.BHZ. 2015-05-22T21:53:59.32 10.0 negative automatic P 268 48.7047 -2.7718 0.575169
AU.MORW.BHZ. 2015-05-22T21:53:55.22 10.0 negative automatic P 241 47.734 0.607296 0.565223
MY.LDM.BHZ. 2015-05-22T21:53:55.57 10.0 negative automatic P 288 47.6899 1.32106 0.578799
IU.NWAO.BHZ.00 2015-05-22T21:53:54.82 10.0 negative automatic P 235 47.682 0.598095 0.279923
IU.MBWA.BHZ.00 2015-05-22T21:53:17.22 10.0 positive automatic P 251 43.1487 -1.02436 0.671815
GE.LUWI.BHZ. 2015-05-22T21:53:06.47 10.0 negative automatic P 281 41.7133 -0.0572919 0.698003
GE.MMRI.BHZ. 2015-05-22T21:52:57.77 10.0 negative automatic P 270 40.7506 -0.860994 0.699578
GE.SOEI.BHZ. 2015-05-22T21:52:40.32 10.0 negative automatic P 268 38.637 -0.859517 0.411392
AU.FORT.BHZ. 2015-05-22T21:52:39.10 10.0 negative automatic P 234 38.3109 0.806737 0.744757
AU.FITZ.BHZ. 2015-05-22T21:52:27.49 10.0 negative automatic P 255 37.2938 -2.18592 0.800394
AU.WRKA.BHZ. 2015-05-22T21:52:18.35 10.0 negative automatic P 242 36.1703 -1.84551 0.832886
AU.HTT.BHZ. 2015-05-22T21:51:41.40 10.0 negative automatic P 221 31.7661 -0.55673 0.893242
AU.MTN.BHZ. 2015-05-22T21:51:41.72 10.0 negative automatic P 263 31.7501 0.00810418 0.863456
AU.TOO.BHZ. 2015-05-22T21:51:37.45 10.0 negative automatic P 208 31.0733 1.6179 0.877138
AU.KDU.BHZ. 2015-05-22T21:51:28.17 10.0 negative automatic P 264 30.4441 -2.00838 0.965928
II.WRAB.BHZ.00 2015-05-22T21:51:19.17 10.0 positive automatic P 249 29.446 -2.23001 0.909091
G.CAN.BHZ.00 2015-05-22T21:51:07.85 10.0 positive automatic P 206 27.6264 2.5979 0.97561
AU.RIV.BHZ. 2015-05-22T21:50:46.97 10.0 negative automatic P 205 25.4362 1.60905 0.43956
IU.AFI.BHZ.00 2015-05-22T21:50:31.52 10.0 positive automatic P 99 24.2376 -3.05066 0.43956
AU.QLP.BHZ. 2015-05-22T21:50:30.60 10.0 negative automatic P 227 23.9213 -1.00251 0.701754
AU.ARMA.BHZ. 2015-05-22T21:50:15.70 10.0 positive automatic P 208 22.3017 0.597441 0.941176
II.KWAJ.BHZ.00 2015-05-22T21:49:52.92 10.0 negative automatic P 12 20.2668 -0.0585935 0.769231
IU.CTAO.BHZ.00 2015-05-22T21:49:40.17 10.0 positive automatic P 239 18.9318 1.72195 0.869565
GE.PMG.BHZ.00 2015-05-22T21:49:06.32 10.0 negative automatic P 274 16.2234 1.06693 0.43956
II.MSVF.BHZ.00 2015-05-22T21:48:55.82 10.0 positive automatic P 117 15.5388 -0.677891 0.43956
IU.TARA.BHZ.00 2015-05-22T21:48:51.55 10.0 negative automatic P 37 15.5194 -4.56443 0.43956
AU.RABL.BHZ. 2015-05-22T21:48:24.27 10.0 positive automatic P 300 13.2107 -0.590325 0
G.DZM.BHZ.00 2015-05-22T21:47:59.00 10.0 positive automatic P 166 11.3519 -0.551301 0.952381
ND.MARNC.BHZ.00 2015-05-22T21:47:56.64 10.0 positive automatic P 158 11.2675 -1.61124 0.909091
ND.KOUNC.BHZ.00 2015-05-22T21:47:35.14 10.0 positive automatic P 176 9.5159 0.877946 0.930233
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://cnt.rm.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