Earthquake with magnitude of Mw 5.6 on date 16-08-2009 and time 22:03:10 (UTC) in region Fiji Islands region [Sea: Fiji]

A magnitude Mw 5.6 earthquake occured in region: Fiji Islands region [Sea: Fiji], on

  • 16-08-2009 22:03:10 (UTC)
  • 17-08-2009 00:03:10 (UTC +02:00) Italian time
  • 17-08-2009 10:03:10 (UTC +12:00) local time in the region of the earthquake (Pacific/Fiji)

and geographic coordinates (lat, lon) -17.9, -179.4 at 633 km depth.

The earthquake was located by: CSEM.

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 90 days

Earthquakes since 1985

Significant earthquakes since 1000 AD until 2006

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 ( 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

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 ( 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 1000 Mw 5.6 2009-08-16
-17.9 -179.4 633 2013-01-05
CSEM 949829
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2009-08-16 22:03:10
Latitude -17.90
Longitude -179.40
Depth (km) 633 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> CSEM
Event type earthquake
Origin ID 949829


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


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec)
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 6
Magnitude information


Field Value
Value 5.6
Num. used stations
Type of magnitude Mw
Reference to an origin 949829
Agency INGV
Autore CSEM
Time of creation (UTC) 2013-01-05 18:07:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FSSB.SHZ. 2009-08-16T22:21:55.65 0.1 undecidable manual PKP 0 0 0
MN.PDG.HHE. 2009-08-16T22:21:54.72 10.0 undecidable manual PKP 0 0 0
MN.TUE.HHZ. 2009-08-16T22:21:52.04 0.1 undecidable manual PKP 0 0 0
IV.MABI.HHZ. 2009-08-16T22:21:51.54 10.0 undecidable manual PKP 0 0 0
IV.CTI.EHZ. 2009-08-16T22:21:51.40 0.1 undecidable manual PKP 0 0 0
IV.MAGA.HHZ. 2009-08-16T22:21:51.94 0.1 undecidable manual PKP 0 0 0
MN.BLY.HHZ. 2009-08-16T22:21:50.16 0.1 undecidable manual PKP 0 0 0
IV.SNTG.SHZ. 2009-08-16T22:21:48.81 10.0 undecidable manual PKP 0 0 0
IV.PTCC.HHZ. 2009-08-16T22:21:48.76 0.1 undecidable manual PKP 0 0 0
IV.SEI.SHZ. 2009-08-16T22:21:48.54 10.0 undecidable manual PKP 0 0 0
IV.FNVD.HHN. 2009-08-16T22:21:44.58 10.0 undecidable manual PKP 0 0 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FNVD.HHN. Md:0 12 END duration s
IV.FNVD.HHE. ML:0 4.0E-5 2.64 AML other m 2009-08-16T22:21:44.58
IV.SEI.SHZ. Md:0 80 END duration s
IV.PTCC.HHN. ML:0 4.0E-5 0.72 AML other m 2009-08-16T22:21:48.76
IV.PTCC.HHE. ML:0 3.5E-5 0.64 AML other m 2009-08-16T22:21:48.76
MN.TUE.HHN. ML:0 2.0E-5 0.96 AML other m 2009-08-16T22:21:52.04
MN.TUE.HHE. ML:0 2.0E-5 2.22 AML other m 2009-08-16T22:21:52.04
IV.FSSB.SHZ. Md:0 38.9 END duration s
IV.PTCC.HHZ. Md:0 16.3 END duration s
MN.BLY.HHZ. Md:0 23 END duration s
IV.CTI.EHZ. Md:0 21 END duration s
IV.MABI.HHZ. Md:0 33 END duration s
IV.MAGA.HHZ. Md:0 33 END duration s
MN.TUE.HHZ. Md:0 8.1 END duration s
MN.PDG.HHE. Md:0 19 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area

Focal Mechanisms

Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download